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Home My WebLink AboutPD 2018-0052; REED RESIDENCE; STORM WATER MANAGEMENT PLAN; 2020-10-20(city of Carlsbad California CITY OF CARLSBAD PRIORITY DEVELOPMENT PROJECT (PDP) STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) FOR: REED RESIDENCE 1375 BUENA VISTA WAY APN: 156-231-21-00 ENGINEER OF WORK: (!) F9 q.4 Jowl MR. HOLY REED 1375 BUENA VISTA WAY CARLSBAD, CA 92008 PREPARED BY: LAMAR ENGINEERING, INC LUIS A. LABRADA, P.E. 217 LANDIS AVENUE CHULA VISTA, CA 91910 DATE: RCEilVJFiD / OCTOBER 20, 2020 DEC 17 2020 LAND DEVELOPMENT ENGNEERjNG . TABLE OF CONTENTS Certification Page Project Vicinity Map FORM E-34 Storm Water Standard Questionnaire Site Information FORM E-36 Standard Project Requirement Checklist Summary of PDP Structural BMPs Attachment 1: Backup for POP Pollutant Control BMPs Attachment la: DMA Exhibit Attachment 1 b: Tabular Summary of DMAs and Design Capture Volume Calculations Attachment lc: Harvest and Use Feasibility Screening (when applicable) Attachment ld: Categorization of Infiltration Feasibility Condition (when applicable) Attachment 1 e: Pollutant Control BMP Design Worksheets / Calculations Attachment 2: Backup for PDP Hydromodification Control Measures Attachment 2a: Hydromodification Management Exhibit Attachment 2b: Management of Critical Coarse Sediment Yield Areas Attachment 2c: Geomorphic Assessment of Receiving Channels Attachment 2d: Flow Control Facility Design Attachment 3: Structural BMP Maintenance Thresholds and Actions Attachment 4: Single Sheet BMP (SSBMP) Exhibit S 0 CERTIFICATION PAGE Project Name: Reed Residence Project ID: I hereby declare that I am the Engineer in Responsible Charge of design of storm water BMPs for this project, and that I have exercised responsible charge over the design of the project as defined in Section 6703 of the Business and Professions Code, and that the design is consistent with the requirements of the BMP Design Manual, which is based on the requirements of SDRWQCB Order No. R9-2013-0001 (MS4 Permit) or the current Order. I have read and understand that the City Engineer has adopted minimum requirements for managing urban runoff, including storm water, from land development activities, as described in the BMP Design Manual. I certify that this SWQMP has been completed to the best of my ability and accurately reflects the project being proposed and the applicable source control and site design BMPs proposed to minimize the potentially negative impacts of this project's land development activities on water quality. I understand and acknowledge that the plan check review of this SWQMP by the City Engineer is confined to a review and does not relieve me, as the Engineer in Responsible Charge of design of storm water BMPs for this project, of my responsibilities for project design. Engineer of Work's Signature, PE Number & Expiration Date Luis A. Labrada Print Name Lamar Engineering, Inc Company October 20, 2020 Date iJ S PROJECT VICINITY MAP VICINITY MAP [JL FOREST AVE. (1) D 0 Z Will CD 11111111 lililJ -\ lily LAS ORES DR. TNOT I TO SCALE PROJECTSI BUENA VISTA WY. CTh11-IIA LN. > U, 0 CD o w Of KNOWLES AVE. IL , 0 I I5 SThAWORD LN. o o \/ \l -J I< \\ F- [Insert City's Storm Water Standard Questionnaire (Form E-34) here] C (City of STORM WATER STANDARDS Development Services Carlsbad QUESTIONNAIRE Land Development Engineering 1635 Faraday Avenue E-34 (760) 602-2750 www.carlsbadca.gov INSTRUCTIONS: To address post-development pollutants that may be generated from development projects, the city requires that new development and significant redevelopment priority projects incorporate Permanent Storm Water Best Management Practices (BMPs) into the project design per Carlsbad BMP Design Manual (BMP Manual). To view the BMP Manual, refer to the Engineering Standards (Volume 5). This questionnaire must be completed by the applicant in advance of submitting for a development application (subdivision, discretionary permits and/or construction permits). The results of the questionnaire determine the level of storm water standards that must be applied to a proposed development or redevelopment project. Depending on the outcome, your project will either be subject to 'STANDARD PROJECT' requirements or be subject to 'PRIORITY DEVELOPMENT PROJECT' (PDP) requirements. Your responses to the questionnaire represent an initial assessment of the proposed project conditions and impacts. City staff has responsibility for making the final assessment after submission of the development application. If staff determines that the questionnaire was incorrectly filled out and is subject to more stringent storm water standards than initially assessed by you, this will result in the return of the development application as incomplete. In this case, please make the changes to the questionnaire and resubmit to the city. If you are unsure about the meaning of a question or need help in determining how to respond to one or more of the questions, please seek assistance from Land Development Engineering staff. A completed and signed questionnaire must be submitted with each development project application. Only one completed and signed questionnaire is required when multiple development applications for the same project are submitted concurrently. PROJECT INFORMATION PROJECT NAME: REED RESIDENCE PROJECT ID: ADDRESS: 1375 BUENA VISTA WAY, CARLSBAD, CA 92008 APN: 156-231-21-00 The project is (check one): EJ New Development EJ Redevelopment The total proposed disturbed area is: 19,167.00 ft2 (_0.44 ) acres The total proposed newly created and/or replaced impervious area is: 11,325.6 ft2 (_0.26 ) acres If your project is covered by an approved SWQMP as part of a larger development project, provide the project ID and the SWQMP # of the larger development project: Project ID SWQMP #: Then, go to Step 1 and follow the instructions. When completed, sign the form at the end and submit this with your application to the city. E-34 Page 1 of 4 REV 02/16 I I STEP I TO BE COMPLETED FOR ALL PROJECTS ro determine if your project is a "development project", please answer the following question: YES NO Is your project LIMITED TO routine maintenance activity and/or repair/improvements to an existing building or structure that do not alter the size (See Section 1.3 of the BMP Design Manual for guidance)? If you answered "yes" to the above question, provide justification below then go to Step 5, mark the third box stating "my project is not a 'development project' and not subject to the requirements of the BMP manual" and complete applicant information. Justification/discussion: (e.g. the project includes only interior remodels within an existing building): If you answered "no" to the above question, the project is a 'development project', go to Step 2. STEP 2 TO BE COMPLETED FOR ALL DEVELOPMENT PROJECTS To determine if your project is exempt from PDP requirements pursuant to MS4 Permit Provision E.3.b.(3), please answer the following questions: Is your project LIMITED to one or more of the following: YES NO 1. Constructing new or retrofitting paved sidewalks, bicycle lanes or trails that meet the following criteria: Designed and constructed to direct storm water runoff to adjacent vegetated areas, or other non- erodible permeable areas; Designed and constructed to be hydraulically disconnected from paved streets or roads; Designed and constructed with permeable pavements or surfaces in accordance with USEPA Green Streets guidance? 2. Retrofitting or redeveloping existing paved alleys, streets, or roads that are designed and constructed in accordance with the USEPA Green Streets guidance? 3. Ground Mounted Solar Array that meets the criteria provided in section 1.4.2 of the BMP manual? If you answered "yes" to one or more of the above questions, provide discussion/justification below, then go to Step 5, mark the second box stating "my project is EXEMPT from PDP ..." and complete applicant information. Discussion to justify exemption ( e.g. the project redeveloping existing road designed and constructed in accordance with the USEPA Green Street guidance): If you answered "no" to the above questions, your project is not exempt from PDP, go to Step 3. E-34 Page 2 of 4 REV 04/17 I STEP 3 TO BE COMPLETED FOR ALL NEW OR REDEVELOPMENT PROJECTS To determine if your project is a PDP, please answer the following questions (MS4 Permit Provision E.3.b.(1)): YES NO Is your project a new development that creates 10,000 square feet or more of impervious surfaces collectively over the entire project site? This includes commercial, industrial, residential, mixed-use, LI and public development projects on public or private land. Is your project a redevelopment project creating and/or replacing 5,000 square feet or more of impervious surface collectively over the entire project site on an existing site of 10,000 square feet or more of impervious surface? This includes commercial, industrial, residential, mixed-use, and public development projects on public or private land. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a restaurant? A restaurant is a facility that sells prepared foods and drinks for consumption, including stationary lunch counters and E] 1X1 refreshment stands selling prepared foods and drinks for immediate consumption (Standard Industrial Classification (SIC) code 5812). Is your project a new or redevelopment project that creates 5,000 square feet or more of impervious surface collectively over the entire project site and supports a hillside development project? A hillside El ZI development project includes development on any natural slope that is twenty-five percent or greater. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface collectively over the entire project site and supports a parking lot? A parking lot is a land area or facility for the temporary parking or storage of motor vehicles used personally for business or for commerce. Is your project a new or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious street, road, highway, freeway or driveway surface collectively over the entire project El ZI site? A street, road, highway, freeway or driveway is any paved impervious surface used for the transportation of automobiles, vehicles. _trucks, _motorcycles, _and _other Is your project a new or redevelopment project that creates and/or replaces 2,500 square feet or more of impervious surface collectively over the entire site, and discharges directly to an Environmentally Sensitive Area (ESA)? "Discharging Directly to" includes flow that is conveyed overland a distance of LI IXI 200 feet or less from the project to the ESA, or conveyed in a pipe or open channel any distance as an isolated flow from to_ the commingled lands).* _the _project _ESA _(i.e._not _with _flows _from _adjacent Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious surface that supports an automotive repair shop? An automotive repair shop is a facility that is categorized in any one of the following Standard Industrial Classification (SIC) codes: 5013, 5014, 5541, 7532-7534, or 7536-7539. Is your project a new development or redevelopment project that creates and/or replaces 5,000 square feet or more of impervious area that supports a retail gasoline outlet (RGO)? This category includes El Z1 RGO's that meet the following criteria: (a) 5,000 square feet or more or (b) a project Average Daily Traffic (AD T) of 100 or more vehicles per day. Is your project a new or redevelopment project that results in the disturbance of one or more acres of land and are expected to generate pollutants post construction? Is your project located within 200 feet of the Pacific Ocean and (1) creates 2,500 square feet or more of impervious surface or (2) increases impervious surface on the property by more than 10%? (CMC LI ZI 21.203.040) If you answered "yes" to one or more of the above questions, your project is a PDP. If your project is a redevelopment project, go to step 4. If your project is a new project, go to step 5, check the first box stating "My project is a PDP and complete applicant information. If you answered "no" to all of the above questions, your project is a 'STANDARD PROJECT.' Go to step 5, check the second box stating "My project is a 'STANDARD PROJECT ...... and complete applicant information. E-34 Page 3 of 4 REV 04/17 I I STEP 4 TO BE COMPLETED FOR REDEVELOPMENT PROJECTS THAT ARE PRIORITY DEVELOPMENT PROJECTS (PDP) ONLY 'Complete the questions below regarding your redevelopment project (MS4 Permit Provision E.3.b.(2)): YES NO Does the redevelopment project result in the creation or replacement of impervious surface in an amount of less than 50% of the surface area of the previously existing development? Complete the percent impervious calculation below: Existing impervious area (A) = 10,977.12 sq. ft. El lxi Total proposed newly created or replaced impervious area (B) = 11,325.60 sq. ft. Percent impervious area created or replaced (B/A)*1 00 = 102 % If you answered yes", the structural BMPs required for PDP apply only to the creation or replacement of impervious surface and not the entire development. Go to step 5, check the first box stating "My project is a PDP .....and complete applicant information. If you answered "no," the structural BMP's required for PDP apply to the entire development. Go to step 5, check the check the first box stating "My project is a PDP ..." and complete applicant information. STEP 5 CHECK THE APPROPRIATE BOX AND COMPLETE APPLICANT INFORMATION LXI My project is a PDP and must comply with PDP stormwater requirements of the BMP Manual. I understand I must prepare a Storm Water Quality Management Plan (SWQMP) for submittal at time of application. LI My project is a 'STANDARD PROJECT' OR EXEMPT from PDP and must only comply with 'STANDARD PROJECT' stormwater requirements of the BMP Manual. As part of these requirements, I will submit a "Standard Project Requirement Checklist Form E-36" and incorporate low impact development strategies throughout my project. Note: For projects that are close to meeting the PDP threshold, staff may require detailed impervious area calculations land exhibits to verify if 'STANDARD PROJECT' stormwater requirements apply. LI My Project is NOT a 'development project' and is not subject to the requirements of the BMP Manual. Applicant Information and Signature Box Applicant Name: LUIS A. LABRADA Applicant Title: P.E. No. 65416 Applicant Signature: Date: October 20, 2020 Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and County of San Diego; Habitat Management Plan; and any other equivalent environmentally sensitive areas which have been identified by the City. This Box for City Use Only City Concurrence: YES NO [II [I] By: Date: Project ID: E-34 Page 4 of 4 REV 04/17 SITE INFORMATION CHECKLIST Project Summary Information Project Name Reed Residence Project ID Project Address 1375 Buena Vista Way Carlsbad, CA, 92008 Assessor's Parcel Number(s) (APN(s)) 156-231-21-00 Project Watershed (Hydrologic Unit) Carlsbad 904 Parcel Area 0.39 Acres (17,00) Square Feet) Existing Impervious Area (subsetofParcelArea) 0.25Acres (10,977.12)Square Feet) Area to be disturbed by the project (Project Area) 0.44 Acres (19,167.00)Square Feet) Project Proposed Impervious Area (subset of Project Area) 0.26 Acres (11,325.60)Square Feet) Project Proposed Pervious Area (subset of Project Area) 0.18 Acres (7,841.40)Square Feet) Note: Proposed Impervious Area + Proposed Pervious Area = Area to be Disturbed by the Project. This may be less than the Parcel Area. 0 S Description of Existing Site Condition and Drainage Patterns Current Status of the Site (select all that apply): Existing development LI Previously graded but not built out U Agricultural or other non-impervious use Li Vacant, undeveloped/natural Description / Additional Information: Existing Land Cover Includes (select all that apply): Vegetative Cover Non-Vegetated Pervious Areas Impervious Areas Description / Additional Information: Underlying Soil belongs to Hydrologic Soil Group (select all that apply): U NRCS Type A NRCS Type B U NRCS Type C U NRCS Type D Approximate Depth to Groundwater (GVV): 0 G Depth <5 feet 5 feet < GW Depth < 10 feet 1110 feet < GW Depth < 20 feet UGW Depth >20 feet Existing Natural Hydrologic Features (select all that apply): U Watercourses U Seeps U Springs U Wetlands None Description /Additional Information: 0 Description of Existing Site Topography and Drainage [How is storm water runoff conveyed from the site? At a minimum, this description should answer (1) whether existing drainage conveyance is natural or urban; (2) describe existing constructed storm water conveyance systems, if applicable; and (3) is runoff from offsite conveyed through the site? if so, describe]: proposed drainage system will mimic the existing drainage pattern and basins designated to ermine the runoff amounts and to properly size any drainage systems, if required. inage improvements are proposed to convey runoff associated with the project. The proposed image improvements will include a 8'x 15' bioretention channel at the front of the property to lect the runoff from the property and allow detention and infiltration into the existing ground and ,' overflow to be conveyed north of the property by a 3" underdrain pipe into an existing image concrete basin which will flow downstream into an existing urban storm conveyance item located in Pio Pico Drive .There is no runoff from other neighboring properties that we 3erved that come to our site. S 0 11 Description of Proposed Site Development and Drainage Patterns Project Description / Proposed Land Use and/or Activities: The proposed improvements include grading to accommodate a two-story single-family residence with attached two-car garage, a detached garage/workshop & an ADU both at the rear of the property, and hardscape improvements. The project site currently consists of a lot with an existing front asphalt concrete driveway, a one-story dwelling unit, a 2-car garage and an ADU which will be demolished to accommodate the proposed private improvements. List/describe proposed impervious features of the project (e.g., buildings, roadways, parking lots, courtyards, athletic courts, other impervious features): Two story single family residence Two car garages Asphalt Concrete Driveway ADU List/describe proposed pervious features of the project (e.g., landscape areas): Landscape Area BMP Does the project include grading and changes to site topography? ®Yes No Description / Additional Information: Does the project include changes to site drainage (e.g., installation of new storm water conveyance systems)? Eli Yes No Description /Additional Information: 0 Identify whether any of the following features, activities, and/or pollutant source areas will be present (select all that apply): LI On-site storm drain inlets LI Interior floor drains and elevator shaft sump pumps Interior parking garages LI Need for future indoor & structural pest control LI Landscape/Outdoor Pesticide Use Li Pools, spas, ponds, decorative fountains, and other water features LI Food service LI Refuse areas LI Industrial processes LI Outdoor storage of equipment or materials Vehicle and Equipment Cleaning LI Vehicle/Equipment Repair and Maintenance LI Fuel Dispensing Areas LI Loading Docks Fire Sprinkler Test Water Miscellaneous Drain or Wash Water LI Plazas, sidewalks, and parking lots 0 S 11 Identification of Receiving Water Pollutants of Concern Describe path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable): In site storm-water collected will be discharged downstream into existing urban storm conveyance system ,which will convey into Buena Vista Creek, runoff is finally discharged to the manmade Buena Vista Lagoon where it finds its way to the Pacific Ocean through a weir structure. List any 303(d) impaired water bodies within the path of storm water from the project site to the Pacific Ocean (or bay, lagoon, lake or reservoir, as applicable), identify the pollutant(s)/stressor(s) causing impairment, and identify any TMDLs for the impaired water bodies: 303(d) Impaired Water Body Pollutant(s)/Stressor(s) TM DLs Buena Vista Creek Sedimentation & Siltation Bacteria Indicators Nutrients Identification of Project Site Pollutants Identify pollutants anticipated from the project site based on all proposed use(s) of the site (see BMP Design Manual Appendix B.6): Pollutant Not Applicable to the Project Site Anticipated from the Project Site Also a Receiving Water Pollutant of Concern Sediment Nutrients Heavy Metals Organic Compounds Trash _&_Debris Oxygen Demanding Substances Oil & Grease Bacteria & Viruses Pesticides fl Hydromodification Management Requirements Do hydromodification management requirements apply (see Section 1.6 of the BMP Design Manual)? Li Yes, hydromodification management flow control structural BMPs required. No, the project will discharge runoff directly to existing underground storm drains discharging directly to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. El No, the project will discharge runoff directly to conveyance channels whose bed and bank ae concrete-lined all the way from the point of discharge to water storage reservoirs, lakes, enclosed embayments, or the Pacific Ocean. Li No, the project will discharge runoff directly to an area identified as appropriate for an exemption by the WMAA for the watershed in which the project resides. Description / Additional Information (to be provided if a 'No' answer has been selected above): Critical Coarse Sediment Yield Areas* *This Section only required if hydromodification management requirements apply Based on the maps provided within the WMAA, do potential critical coarse sediment yield areas exist within the project drainage boundaries? LI Yes Li No, No critical coarse sediment yield areas to be protected based on WMAA maps If yes, have any of the optional analyses presented in Section 6.2 of the BMP Design Manual been performed? Li 6.2.1 Verification of Geomorphic Landscape Units (GLUs) Onsite Li 6.2.2 Downstream Systems Sensitivity to Coarse Sediment LI 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite Li No optional analyses performed, the project will avoid critical coarse sediment yield areas identified based on WMAA maps If optional analyses were performed, what is the final result? Li No critical coarse sediment yield areas to be protected based on verification of GLUs onsite Li Critical coarse sediment yield areas exist but additional analysis has determined that protection is not required. Documentation attached in Attachment 8 of the SWQMP. Li Critical coarse sediment yield areas exist and require protection. The project will implement management measures described in Sections 6.2.4 and 6.2.5 as applicable, and the areas are identified on the SWQMP Exhibit. Discussion /Additional Information: S Flow Control for Post-Project Runoff* *This Section only required if hydromodification management requirements apply List and describe point(s) of compliance (POCs) for flow control for hydromodification management (see Section 6.3.1). For each POC, provide a POC identification name or number correlating to the project's HMP Exhibit and a receiving channel identification name or number correlating to the project's HMP Exhibit. Has a geomorphic assessment been performed for the receiving channel(s)? No, the low flow threshold is 0.1 Q2 (default low flow threshold) [Yes, the result is the low flow threshold is 0.1Q2 ii Yes, the result is the low flow threshold is 0.3Q2 [Yes, the result is the low flow threshold is 0.5Q2 If a geomorphic assessment has been performed, provide title, date, and preparer: Discussion /Additional Information: (optional) Other Site Requirements and Constraints When applicable, list other site requirements or constraints that will influence storm water management design, such as zoning requirements including setbacks and open space, or City codes governing minimum street width, sidewalk construction, allowable pavement types, and drainage requirements. N/A Optional Additional Information or Continuation of Previous Sections As Needed This space provided for additional information or continuation of information from previous sections as needed. N/A [I 11 [Insert City's Standard Project Requirement Checklist Form E-36 (here)] [I S (city of Carlsbad STANDARD PROJECT REQUIREMENT CHECKLIST E-36 Development Services Land Development Engineering 1635 Faraday Avenue (760) 602-2750 www.carlsbadca.gov Project Information Project Name: REED RESIDENCE Project ID: DWG No. or Building Permit No.: Source Control BMPs All development projects must implement source control BMPs SC-1 through SC-6 where applicable and feasible. See Chapter 4 and Appendix EA of the BMP Design Manual (Volume 5 of City Engineering Standards) for information to implement source control BMPs shown in this checklist. Answer each category below pursuant to the following. 'Yes means the project will implement the source control BMP as described in Chapter 4 and/or Appendix EA of the Model BMP Design Manual. Discussion/justification is not required. "No' means the BMP is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. "N/A' means the BMP is not applicable at the project site because the project does not include the feature that is addressed by the BMP (e.g., the project has no outdoor materials storage areas). Discussion/justification may be provided. Source Control Requirement Applied? SC-I Prevention of Illicit Discharges into the MS4 Ii Yes El No El N/A Discussion/justification if SC-1 not implemented: SC-2 Storm Drain Stenciling or Signage El Yes El No Ill N/A Discussion/justification if SC-2 not implemented: SC-3 Protect Outdoor Materials Storage Areas from Rainfall Run-On Runoff, and Wind Ill Yes El No El N/A Dispersal Discussion/justification if SC-3 not implemented: Page 1 of 4 Revised 09116 S Source Control Requirement (continued) Applied? SC-4 Protect Materials Stored in Outdoor Work Areas from Rainfall Run-On Runoff, and Wind Dispersal I!] Yes E] No El N/A Discussion/justification if SC-4 not implemented: SC-5 Protect Trash Storage Areas from Rainfall, Run-On, Runoff, and Wind Dispersal % Yes LI No El N/A Discussion/justification if SC-5 not implemented.- SC-6 Additional BMPs based on Potential Sources of Runoff Pollutants must answer for each source listed below and identify additional BMPs. (See Table in Appendix E.1 of BMP Manual for guidance). LI On-site storm drain inlets LI Yes LI No III N/A Interior floor drains and elevator shaft sump pumps LI Yes LI No i N/A 0 Interior parking garages LI Yes LI No ii N/A Need for future indoor & structural pest control LI Yes LI No EI N/A 0 Landscape/Outdoor Pesticide Use LI Yes 0 No III N/A Pools, spas, ponds, decorative fountains, and other water features LI Yes 0 No I!J N/A Food service LI Yes 0 No ii N/A LI Refuse areas LI Yes LI No ii N/A El Industrial processes LI Yes LI No !I N/A LI Outdoor storage of equipment or materials LI Yes 0 No lJ N/A O Vehicle and Equipment Cleaning LI Yes 0 No III N/A LI Vehicle/Equipment Repair and Maintenance LI Yes LI No !I N/A LI Fuel Dispensing Areas 0 Yes 0 No !I N/A LI Loading Docks El Yes El No Ii] N/A O Fire Sprinkler Test Water El Yes LI No III N/A D Miscellaneous Drain or Wash Water LI Yes LI No III N/A LI Plazas, sidewalks, and parking lots LI Yes 0 No III N/A For "Yes" answers, identify the additional BMP per Appendix El. Provide justification for "No' answers. E-36 Page 2 of Revised 09/16 Site Design BMPs All development projects must implement site design BMPs SD-1 through SD-8 where applicable and feasible. See Chapter 4 and Appendix E.2 thru E.6 of the BMP Design Manual (Volume 5 of City Engineering Standards) for information to implement site design BMPs shown in this checklist. Answer each category below pursuant to the following. 'Yes' means the project will implement the site design BMPs as described in Chapter 4 and/or Appendix E.2 thru E.6 of the Model BMP Design Manual. Discussion /justification is not required. "No" means the BMPs is applicable to the project but it is not feasible to implement. Discussion/justification must be provided. Please add attachments if more space is needed. "N/A" means the BMPs is not applicable at the project site because the project does not include the feature that is addressed by the BMPs (e.g., the project site has no existing natural areas to conserve). Discussion/justification may be provided. Site Design Requirement Applied? SD-I Maintain Natural Drainage Pathways and Hydrologic Features LI Yes LI No !I N/A Discussion/justification if SD-1 not implemented: SD-2 Conserve Natural Areas, Soils, and Vegetation III Yes LI No LI N/A Discussion/justification if SD-2 not implemented: SD-3 Minimize Impervious Area I * Yes I LI No I 0 N/A Discussion/justification if SD-3 not implemented: SD-4 Minimize Soil Compaction I ii Yes I LI No I LI N/A Discussion/justification if SD-4 not implemented: SD-5 Impervious Area Dispersion lI Yes LI No LI N/A Discussion/justification if SD-5 not implemented: E-36 Page 3 of 4 Revised 09/16 S Site Design Requirement (continued) Applied? SD-6 Runoff Collection lj Yes El No 0 N/A Discussion/justification if SD-6 not implemented: SD-7 Landscaping with Native or Drought Tolerant Species El Yes El No lii N/A Discussion/justification if SD-7 not implemented: SD-8 Harvesting and Using Precipitation I E Yes I 0 No jj N/A Discussion/justification if SD-8 not implemented: E-36 Page 4 of 4 Revised 09/16 S PDP Structural BMPs All PDPs must implement structural BMPs for storm water pollutant control (see Chapter 5 of the BMP Design Manual). Selection of PDP structural BMPs for storm water pollutant control must be based on the selection process described in Chapter 5. PDPs subject to hydromodification management requirements must also implement structural BMPs for flow control for hydromodification management (see Chapter 6 of the BMP Design Manual). Both storm water pollutant control and flow control for hydromodification management can be achieved within the same structural BMP(s). PDP structural BMPs must be verified by the City at the completion of construction. This may include requiring the project owner or project owner's representative to certify construction of the structural BMPs (see Section 1.12 of the BMP Design Manual). PDP structural BMPs must be maintained into perpetuity, and the City must confirm the maintenance (see Section 7 of the BMP Design Manual). Use this form to provide narrative description of the general strategy for structural BMP implementation at the project site in the box below. Then complete the PDP structural BMP summary information sheet for each structural BMP within the project (copy the BMP summary information page as many times as needed to provide summary information for each individual structural BMP). Describe the general strategy for structural BMP implementation at the site. This information must describe how the steps for selecting and designing storm water pollutant control BMPs presented in Section 5.1 of the BMP Design Manual were followed, and the results (type of BMPs selected). For projects requiring hydromodification flow control BMPs, indicate whether pollutant control and flow control BMPs are integrated together or separate. Because of the low infiltration rate conditions of the site soil, full infiltration is not feasible and therefore biofiltration with partial retention treatment facility will be selected for this project. The proposed site will drain the runoff towards the biofiltration with partial retention basin at the north east corner of the site via underdrain pipes. The proposed basin will provide both water quality treatment and flow control treatment. The basin will be covered by a 18" thick engineered soil media layer in compliance to the City's standards for biofiltration. A 12" stone storage layer under he engineered soil will provide the necessary space for the water to infiltrate into the natural soil. 6" perforated underdrain will sit in the stone storage layer to convey the treated water after the stone storage is filled. A 1.5" diameter circular orifice is proposed to control the outflow for smaller storm events, and a 12" riser and overflow pipe are proposed to handle bigger storm events. The discharge will enter the underground storm system through the drainage basin located in Buena Vista Way and convey to Buena Vista Creek to finally discharge into the Pacific Ocean. See Worksheet for BMP sizing calculations. [Continue on next page as necessary.] S [Continued from previous page - This page is reserved for continuation of description of general strategy for structural BMP implementation at the site.] Structural BMP Summary Information [Copy this page as needed to provide information for each individual proposed structural BMP] Structural BMP ID No. DWG Sheet No. Type of structural BMP: LI Retention by harvest and use (HU-I) El Retention by infiltration basin (INF-l) Retention by bioretention (INF-2) Li Retention by permeable pavement (INF-3) 11 Partial retention by biofiltration with partial retention (PR-1) ® Biofiltration (BF-1) LI Flow-thru treatment control included as pre-treatment/fore bay for an onsite retention o biofiltration BMP (provide BMP type/description and indicate which onsite retention or biofiltration BMP it serves in discussion section below) LI Detention pond or vault for hydromodification management LI Other (describe in discussion section below) Purpose: Pollutant control only LI Hydromodification control only LI Combined pollutant control and hydromodification control LI Pre-treatment/forebay for another structural BMP LI Other (describe in discussion section below) Discussion (as needed): 0 ATTACHMENT I BACKUP FOR POP POLLUTANT CONTROL BMPS This is the cover sheet for Attachment 1. Check which Items are Included behind this cover sheet: Attachment Contents Checklist Sequence Attachment la DMA Exhibit (Required) A Included See DMA Exhibit Checklist on the back of this Attachment cover sheet. (24"x36" Exhibit typically required) Attachment lb Tabular Summary of DMAs Showing o Included on DMA Exhibit h DMA ID matching DMA Exhibit, DMA Attachment la Area, and DMA Type (Required)* E Included as Attachment lI separate from DMA Exhibit *Provide table in this Attachment OR on DMA Exhibit in Attachment 1 a Attachment lc Form 1-7, Harvest and Use Feasibility El Included Screening Checklist (Required unless ® Not included because the entire the entire project will use infiltration project will use infiltration BMPs BMPs) Refer to Appendix 13.3-1 of the BMP Design Manual to complete Form 1-7. Attachment ld Form 1-8, Categorization of Infiltration 9 Included Feasibility Condition (Required unless 1 Not included because the entire the project will use harvest and use project will use harvest and use BMPs) BMPs Refer to Appendices C and D of the BMP Design Manual to complete Form 1-8. Attachment le Pollutant Control BMP Design ® Included Worksheets I Calculations (Required) Refer to Appendices B and E of the BMP Design Manual for structural pollutant control BMP design guidelines 0 Use this checklist to ensure the required information has been included on the DMA Exhibit: The DMA Exhibit must identify: Underlying hydrologic soil group Approximate depth to groundwater D Existing natural hydrologic features (watercourses, seeps, springs, wetlands) Critical coarse sediment yield areas to be protected (if present) Existing topography and impervious areas Existing and proposed site drainage network and connections to drainage offsite 19 Proposed grading Proposed impervious features Proposed design features and surface treatments used to minimize imperviousness Drainage management area (DMA) boundaries, DMA ID numbers, and DMA areas (square footage or acreage), and DMA type (i.e., drains to BM P, self-retaining, or self-mitigating) Structural BMPs (identify location and type of BMP) 0 Appendix E: BMP Design Fact Sheets The following fact sheets were developed to assist the project applicants with designing BMPs to meet the storm water obligations: Source Control Source Control SC: Source Control BMP Requirements SD-I: Tree Wells SD-5: Impervious Area Dispersion Site Design Site Design SD-6A: Green Roofs SD-6B: Permeable Pavement (Site Design BMP) SD-8: Rain Barrels Harvest and Use HU-1: Cistern Retention INF-1: Infiltration Basins Infiltration INF-2: Bioretention INF-3: Permeable Pavement (Pollutant Control) Partial Retention PR-1: Biofiltration with Partial Retention Biofiltration Biofiltration Biofiltration Nutrient Sensitive Media Design Proprietary Biofiltration Vegetated Swales Flow-thru Treatment Flow-tbnr Treatment Media Filters Control with Alternative Sand Filters Control* Compliance Dry Extended Detention Basin Proprietary Flow-thru Treatment Control PL: Plant List * Flow-thru Treatment Control BMPs are not options as structural BMPs. Carlsbad does not have an Alternative Compliance 40 Program at this time. E-1 February 2016 . . I Appendix E: BMP Design Fact Sheets El Source Control BMP Requirements Worksheet E.1-1: Source Control BMP Requirements How to comply: Projects shall comply with this requirement by implementing all source control BMPs listed in this section that are applicable to their project. Applicability shall be determined through consideration of the development project's features and anticipated pollutant sources. Appendix E.1 provides guidance for identifying source couLwl BMPs appliLabic Lu a project. The City's Standard Project Requirements Checklist E--36 shall be used to document compliance with source control BMP requirements. How to use this worksheet: Review Column 1 and identify which of these potential sources of storm water pollutants apply to your site. Check each box that applies. Review Column 2 and incorporate all of the corresponding applicable BMPs in your project site plan. Review Columns 3 and 4 and incorporate all of the corresponding applicable permanent controls and operational BMPs in a table in your project specific storm water management lepulL. Describe your specific BMPs in an accompanying narrative, and explain any special conditions or situations that required omitting BMPs or substituting alternatives. E-2 February 2016 . . S Appendix E: BMP Design Fact Sheets ill1Bi Pro je_c Site.:.1. 1 Potential Sources of Runoff Pollutants I A. Onsite storm drain inlets D Not Applicable 3 Permanent Controls—List in Table and Narrative I Mark all inlets with the words "No Dumping! Flows to Bay" or similar. 4 Operational BMPs—Include in Table and Narrative L1 Maintain and periodically repaint or replace inlet markings. El Provide storm water pollution prevention information to new site owners, lessees, or operators. LI See applicable operational BMPs in Fact Sheet SC-44, "Drainage System Maintenance," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com. LI Include the following in lease agreements: "Tenant shall not allow anyone to discharge anything to storm drains or to store or deposit materials so as to create a potential discharge to storm drains." U. Tihen 2 Permanent Controls—Show on Drawings Locations of inlets. E-3 February 2016 Appendix E: BMP Design Fact Sheets T1 gg 000 _ Øy fP - (flTflV ¶Ih 1UI (iX1 1 2 3 4 Potential Sources of Permanent Controls-Show on Permanent Controls-List in Table Operational BMPs-Include in Runoff Pollutants Drawings and Narrative Table and Narrative D B. Interior floor drains Lj State that interior floor drains andJ Inspect and maintain drains to and elevator shaft elevator shaft sump pumps will be prevent blockages and overflow. sump pumps plumbed to sanitary sewer. 0 Not Applicable J C. Interior parking D State that parking garage floor D Inspect and maintain drains to garages drains will be plumbed to the prevent blockages and overflow. 0 Not Applicable sanitary sewer or an approved BMP l Dl. Need for future [J Note building design features that LJ Provide Integrated Pest indoor & structural discourage entry of pests. Management information to pest control owners, lessees, and operators. 0 Not Applicable E-4 February 2016 S . . Appendix E: BMP Design Fact Sheets 000 c4ffl iiii (inirn 1]J 2 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Table Operational BMPs—Include in Runoff Pollutants Drawings and Narrative Table and Narrative 0 D2. Landscape/ U Show locations of existing State that final landscape plans will 0 Maintain landscaping using Outdoor Pesticide trees or areas of shrubs and accomplish all of the following, minimum or no pesticides. Use U Not Applicable ground cover to be U Preserve existing drought tolerant trees, 0 See applicable operational undisturbed and retained, shrubs, and ground cover to the BMPs in Fact Sheet SC-41, 0 Show self-retaining landscape maximum extent possible. "Building and Grounds areas, if any. 0 Design landscaping to minimize Maintenance," in the CASQA Q Show storm water treatment irrigation and runoff, to promote Stormwater Quality Handbooks facilities, surface infiltration where appropriate, at www.cabmphandbooks.com. and to minimize the use of fertilizers U Provide IPM information to and pesticides that can contribute to new owners, lessees and storm water pollution. operators. 0 Where landscaped areas are used to retain or detain storm water, specify plants that are tolerant of periodic saturated soil conditions. o Consider using pest-resistant plants, especially adjacent to hardscape. O To ensure successful establishment, select plants appropriate to site soils, slopes, climate, sun, wind, rain, land use, air movement, ecological consistency, and plant interactions. E-5 February 2016 . . . Appendix E: BMP Design Fact Sheets rna (& ooc pop gft mrfl TJ (irnrnJ1 j1 1 2 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Table Operational BMPs—Include Runoff Pollutants Drawings and Narrative in Table and Narrative E. Pools, spas, ponds, U Show location of water feature U Pool backwash to be plumbed to the U See applicable operational decorative fountains, and a sanitary sewer cleanout in sanitary sewer. Place a note on the BMPs in Fact Sheet SC-72, and other water an accessible area within 10 feet. plans and state in the narrative that "Fountain and Pool features. this connection will be made Maintenance," in the CASQA Not Applicable according to city requirements. Stormwater Quality Handbooks at www.cabmphandbooks.com. U F. Food service U For restaurants, grocery stores, U Describe the location and features of Not Applicable and other food service the designated cleaning area. operations, show location U Describe the items to be cleaned in (indoors or in a covered area this facility and how it has been sized outdoors) of a floor sink or other to ensure that the largest items can be area for cleaning floor mats, accommodated. containers, and equipment. U On the drawing, show a note that this drain will be connected to a grease interceptor before discharging to the sanitary sewer. E-6 February 2016 S . S Appendix E: BMP Design Fact Sheets ri oX) 000 1tk Wii 4J ftLO cimr IJ iig. (icirniI £1J 1 2 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Table Operational BMPs—Include in Runoff Pollutants Drawings and Narrative Table and Narrative U G. Refuse areas U Show where site refuse and U State how site refuse will be U State how the following will be 0 Not Applicable recycled materials will be handled and provide supporting implemented: handled and stored for pickup. detail to what is shown on plans. Provide adequate number of U If dumpsters or other receptacles U State that signs will be posted on receptacles. Inspect receptacles are outdoors, show how the or near dumpsters with the words regularly; repair or replace leaky designated area will be covered, "Do not dump hazardous receptacles. Keep receptacles graded, and paved to prevent materials here" or similar. covered. Prohibit/prevent run- on and show locations of dumping of liquid or hazardous berms to prevent runoff from wastes. Post "no hazardous the area. Also show how the materials" signs. Inspect and pick designated area will be protected up litter daily and clean up spills from wind dispersal. immediately. Keep spill control U Any drains from dumpsters, materials available on- site. See compactors, and tallow bin areas Fact Sheet SC-34, "Waste shall be discharged to an Handling and Disposal" in the approved BMP. CASQA Stormwater Quality Handbooks at U Refer to City Standard Drawing www.cabmphandbooks.com. GS-16 for details. E-7 February 2016 Appendix E: BMP Design Fact Sheets 000 (L111 J1J -o00 1 2 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Table and Operational BMPs—Include Runoff Pollutants Drawings Narrative in Table and Narrative Table and Narrative Lj H. Industrial LJ Show process area. D If industrial processes are to be located D See Fact Sheet SC-10, "Non- processes. onsite, state: "All process activities to be Stormwater Discharges" in the D Not Applicable performed indoors. No processes to CASQA Stormwater Quality drain to exterior or to storm drain Handbooks at system." www.cabmphandbooks.com. D I. Outdoor storage of LJ Show any outdoor storage D Include a detailed description of D See the Fact Sheets SC-31, equipment or areas, including how materials materials to be stored, storage areas, and "Outdoor Liquid Container materials. (See rows J will be covered. Show how structural features to prevent pollutants Storage" and SC-33, "Outdoor and K for source areas will be graded and from entering storm drains. Storage of Raw Materials" in control measures for bermed to prevent run-on or Where appropriate, reference the CASQA Stormwater vehicle cleaning, runoff from area and protected documentation of compliance with the Quality Handbooks at repair, and from wind dispersal. requirements of local Hazardous www.cabmphandbooks.com. maintenance.) El Storage of non-hazardous Materials Programs for: D Not Applicable liquids shall be covered by a Hazardous Waste Generation roof and/or drain to the sanitary sewer system, and be Hazardous Materials Release contained by berms, dikes, Response and Inventory liners, or vaults. California Accidental Release Ll Storage of hazardous materials Prevention Program and wastes must be hi m Aboveground Storage Tank compliance with the city's hazardous materials ordinance Uniform Fire Code Article 80 and a Hazardous Materials Section 103(b) & (c) 1991 Management Plan for the site. Underground Storage Tank E-8 February 2016 Appendix E: BMP Design Fact Sheets rr .- 0 000 If1U rirnJ 1UXQ ThJ[ UóJMffib 1 2 3 4 Potential Sources of Permanent Controls—Show on Drawings Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Table and Narrative Table and Narrative U J. Vehicle and U Show on drawings as appropriate: J If a car wash area is not Describe operational measures to Equipment Cleaning Commercial/industrial facilities having provided, describe measures implement the following (if Not Applicable vehicle /equ13 ipment cleaning needs shall either taken to discourage onsite applicable): car washing and explain how provide a covered, bermed area for washing these will be enforced. activities or discourage vehicle /equipment U Washwater from vehicle and washing by removing hose bibs and installing equipment washing operations signs prohibiting such uses. shall not be discharged to the Commercial car wash facilities shall be storm drain system. designed such that no runoff from the facility U Car dealerships and similar may rinse cars with water only. is discharged to the storm drain system. Wastewater from the facility shall discharge to U See Fact Sheet SC-21, "Vehicle the sanitary sewer, or a wastewater reclamation and Equipment Cleaning," in system shall be installed. the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com E-9 February 2016 Appendix E: BMP Design Fact Sheets rut i:1IL I OR LYtt Sii R* rft'(fl ,iii__'ir XU1L (iiuRsJ1 £1UJ _' (EM 1 2 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Drawings Table and Narrative Table and Narrative U K. U Accommodate all vehicle U State that no vehicle repair or In the report, note that all of the following Vehicle/Equipment equipment repair and maintenance will be done restrictions apply to use the site: Repair and maintenance indoors or designate outdoors, or else describe the U No person shall dispose of, not permit Maintenance an outdoor work area and design required features of the the disposal, directly or indirectly of Not Applicable the area to protect from rainfall, outdoor work area. vehicle fluids, hazardous materials, or run-on runoff, and wind dispersal. U State that there are no floor rinsewater from parts cleaning into U Show secondary containment for drains or if there are floor storm drains. exterior work areas where motor drains, note the city from U No vehicle fluid removal shall be oil, brake fluid, gasoline, diesel which an industrial waste performed outside a building, nor on fuel, radiator fluid, acid- discharge permit will be asphalt or ground surfaces, whether containing batteries or other obtained and that the design inside or outside a building, except in hazardous materials or hazardous meets city's requirements. such a manner as to ensure that any wastes are used or stored. Drains U State that there are no tanks, spilled fluid will be in an area of shall not be installed within the containers or sinks to be used secondary containment. Leaking secondary containment areas. for parts cleaning or rinsing vehicle fluids shall be contained or U Add a note on the plans that states or, if there are, note the city drained from the vehicle immediately. either (1) there are no floor drains, from which an industrial U No person shall leave unattended drip or (2) floor drains are connected waste discharge permit will be parts or other open containers to wastewater pretreatment obtained and that the design containing vehicle fluid, unless such systems prior to discharge to the meets city's requirements. containers are in use or in an area of sanitary sewer and an industrial secondary containment. waste discharge permit will be obtained. E-10 February 2016 Appendix E: BMP Design Fact Sheets WT%M@WM3MWMWY MY goQQ _____ _____ coo Tom W EB on1 1Jr 1i 3IJi 1 2 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Drawings Table and Narrative Table and Narrative U L. Fuel Dispensing U Fueling areas1 shall have U The property owner shall dry sweep Areas impermeable floors (i.e., portland the fueling area routinely. 0 Not Applicable cement concrete or equivalent U See the Business Guide Sheet, smooth impervious surface) that "Automotive Service—Service are (1) graded at the minimum Stations" in the CASQA Stormwater slope necessary to prevent Quality Handbooks at ponding; and (2) separated from www.cabmphandbooks.com. the rest of the site by a grade break that prevents run-on of storm water to the MEP. U Fueling areas shall be covered by a canopy that extends a minimum of ten feet in each direction from each pump. [Alternative: The fueling area must be covered and the cover's minimum dimensions must be equal to or greater than the area within the grade break or fuel dispensing area'.] The canopy [or cover] shall not drain onto the fueling area. 1. The fueling area shall be defmed as the area extending a minimum of 6.5 feet from the corner of each fuel dispenser or the length at which the hose and nozzle assembly may be operated plus a minimum of one foot, whichever is greater. E-11 February 2016 . . . Appendix E: BMP Design Fact Sheets 000 HI ¶kiW tRtji hff1 ici iiii 2 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Drawings Table and Narrative Table and Narrative M. Loading Docks IJ Show a preliminary design for the U Move loaded and unloaded items D Not Applicable loading dock area, including indoors as soon as possible. roofing and drainage. Loading J See Fact Sheet SC-30, "Outdoor docks shall be covered and/or Loading and Unloading," in the graded to minimize run-on to and CASQA Stormwater Quality runoff from the loading area. Roof Handbooks at downspouts shall be positioned to www.cabmphandbooks.com. direct storm water away from the loading area. Water from loading dock areas should be drained to an approved BMP. Direct connections to storm drains from depressed loading docks are prohibited. LI Loading dock shall be equipped with a spill control valve or equivalent device, which shall be kept closed during periods of operation. D Provide a roof overhang over the loading area or install door skirts (cowling) at each bay that enclose the end of the trailer. E-12 February 2016 Appendix E: BMP Design Fact Sheets WTVJXQ OHM? 000 mm Stun MA03V @km idf 1JIJLX &xxiu (inrn affib 1 2 3 4 Potential Sources of Permanent Controls— Permanent Controls—List in Table and Operational BMPs—Include in Runoff Pollutants Show on Drawings Narrative Table and Narrative U N. Fire Sprinkler U Provide a means to drain fire sprinkler test water U See the note in Fact Sheet SC- Test Water to the sanitary sewer or approved BMP. 41, "Building and Grounds O Not Applicable Maintenance," in the CASQA Stormwater Quality Handbooks at www.cabmphandbooks.com. 0. Miscellaneous Drain or U Boiler drain lines shall be directly or indirectly Wash Water connected to the sanitary sewer system and may U Boiler drain lines not discharge to the storm drain system. U Condensate drain U Condensate drain lines may discharge to lines landscaped areas if the flow is small enough that U Rooftop runoff will not occur. Condensate drain lines may equipment not discharge to the storm drain system. U Drainage sumps U Rooftop mounted equipment with potential to produce pollutants shall be roofed and/or have U Roofing, gutters, secondary containment. and trim U Any drainage sumps onsite shall feature a 0 Not Applicable sediment sump to reduce the quantity of sediment in pumped water. U Avoid roofing, gutters, and trim made of copper or other unprotected metals that may leach into runoff. E-13 February 2016 Appendix E: BMP Design Fact Sheets MGM WUMR py 1ro Ww R ft1O .ii ¶1ihr rirn cjinj 1 2 3 4 Potential Sources of Permanent Controls—Show on Permanent Controls—List in Operational BMPs—Include in Runoff Pollutants Drawings Table and Narrative Table and Narrative El P. Plazas, sidewalks, LI Plazas, sidewalks, and parking lots shall and parking lots, be swept regularly to prevent the D Not Applicable accumulation of litter and debris. Debris from pressure washing shall be collected to prevent entry into the storm drain system. Washwater containing any cleaning agent or degreaser shall be collected and discharged to the sanitary sewer and not discharged to a storm drain. E-14 February 2016 — - -- . - J AVEL ~~_ C.~ Ll I — LEGEND - SUB-BASIN BOUNDARY a xx SUB-BASIN DESIGNATION XX SUB-BASIN AREA (ACRES) NODE —.....—..—FLOW PATH EXISTING DRAINAGE SUMMARY: THE EAIS71NQ SITE IS CURRENTLY IN OE1EL(PW CONDMONS ,THE SURFACE RUNOFF BILL CYJI€Y AND DISCHARGE DIRECTLY INTO A CONCRETE BASH LOCA TED IN BUENA WSTA WAY. THE RUNOFF BILL FLOW DOIWISIREAM INTO A S7M DRAIN CHANNEL LOC.41EL IN PlO FICO LIE AND FINALLY DISCHARGED TO BUENA WSTA OREBC CCSYA NOTE: THE PRO.ECT IS NOT LOCATED IN DR BILL NOT REf DR DRAIN FROM ANY CR17TOAL COURSE SEDIMENT VELD AREA. SOILS NOTE: THE FRG.ECT SITE IS EN7IRELY LOOMED BI1NIN A TIFE B CLASSEFTED AREA PER GROUNDWATER NOTE: DEPTh! 10 WATER TAKEr MORE THAN 80 INWE w NORTH GRAPHIC SCALE (IN Pr) 1Ih- Wit. SHEET CITY OF CARLSBAD SHEETS ENGINEERING DEPARTMENT I PRE DEVELOPMENT REED RESIDENCE DRAINAGE PLAN IV& 1375 BUENA VISTA WAY CARLSBAD, CA 92008 APN: 156-231-21-00 11TLE SHEET APPROVED: JASON S. GELDERT Dli ENGINEER RCE 83912 OPINES 9/30/18 DATE OWN BY: PROJECT NO. DRAPING NO. CHKD BY:................. RVWD BY: BASIN AREA C I QIOO Tc A-1 0.17 0.66 6.6 0.74 5.0 A-2 0.22 0.71 6.1 0.96 5.5 [I 0 0 FWO.ECT DESCRIP17M 1. DEMJ9I 9XS17NC MAIN DBELLIN GARAGE AND ADU 2 PROPOSED NEW OilV.JJNO NEW G4RA/0T10E NEW a44DE/1$tWKS1IGi NEW ADU. ZGVINO R-1 LEGAL FM17159 PAR 1 APt! 1562J1.2I.0O !S7RUC11DR ME V-B OCCUPANCY a.A. RS/IJ RIM(LERS PROPOSED BUILDING HEIWT 24-0 MAIN OP.E1JJNG 988S GARAGE l. 44O. ADU 552w TOTAL Z978 7tIC7URAL LOT COVERAGE, LOT 17.S36 40% ALLOWAE 6934 WiP COVERAGe OVERALL RDUARE FOOTArJEI 2-STORY DP&IJ.JNQ Z0649 4Of0 (iF 1,843S+UF Z167S) ATTACHED GARAGE 5093i O4RArE4lQTKStl0P 860.W 660St 1-STORY A.D.U. 6405C 6405 TOTAL 19.4% 4364 8I9 FRDRI' 20' 50E 9202' # 92.01'Y-5 - 92015' x .10 — 9.2015' REM, 92015' x .20 - 18.403' 97F DESM, NEW IMccRWOUS COYDREIE 01111€WAY AREA 4562S' NEW IMPERWOUS CGWDREIE YARD AREA NEW IMPERWOUS BUILDING AREA 3364g TOTAL 615X 11.006 VICINITY MAP PcT & 88018 951* 0 NORTH GRAPHIC SCALE (Di 7T) 1th08 loft. LENGTH AS-' NECESS.4RY , SIJ WflJE TPFE #L WATER 11ff z 94VOTT PER PLAN .. 170/f LINE 6' TW 7M RON5 OR HOLES i 3' ac AND 720 ANIlE APART M BE ffVSTAUW IW111 HOLES FCAIlD AT80TTL BIORETENTION BASIN NTS SHEET CITY OF CARLSBAD SHEETS ENGINEERING DEPARTMENT POST DEVEWPMBNT REED RESIDENCE DRAINAGE PLAN FDrc 1375 BUENA VISTA WAY CARLSBAD, CA 92008 APN: 156-231-21-00 TiTLE SHEET APPROVED: JASON S. GELXIERT DIV ENGINEER RCE 63912 EXPIRES 9/30/18 DATE OWN BY: PROJECT NO. DRAPING NO. CHKD BY: RVWD BY: VICINITY MAP II PRT 8ff 898* *81* TI 0 0 3 TOTAL LOT AREA =17.159 SO/PT (039 Ac) 0 TOTAL DISTURBED AREA 79,167 SQ/PT (0.44 Ac) I Z (THiS AREA INCLUDES BUT IS NOT LIMITED TO I 0 C#F-STE 80(0< INCLUDING PUBLIC IMPROVEMENTS AND TEMPORARY DISTURBANCE SUCH AS VEHICLE AND EQ'J(PMGAT STAGING AREAS; CQ'ISIRUC ITCH WORKER FOOT TRAFFIC. SC(L/QIA*EL PILES. uiiurr "- TRENCHES; BAO<FTLL CUTS AND SLOPE KEYWAYS) TOTAL REPLACED IMPERVIOUS AREA =0.252 AC TOTAL PROPOSED IMPERVIOUS AREA J5260 AC I PROPOSED DRAINAGE SUMMARY THE PROPOSM STE NILL DRAIN THE RUNT TOWARDS THE I BIDRLTRATICAV 8! 111 PARTIAL RE7ENTIOY 8AN AT THE NORTH EAST I CORNER OF THE STE WA UNDERCRAJN PIPES. THE PRQ°'OD BASIN BILL I PROVIDE 80111 WATER QUALITY TREATMENT AND FLOW CQVTRCE, I TREATMBIT THE DISCHARGE KILL ENTER THE (.WOUND STORM S)TEM ThWOUGI THE DRAINAGE 84911 LOCATED IN BUENA VISTA WAY \.L 4 AND CONVEY TO BUENA WSTA OWN TO FINALLY DI'SQVAROE INTO THE PAaF1C ocEAN SEE WK-SHEET FUR &W S27NG CAL WLA 17OY CCSYA NOTE: C THE PROECT IS NOT LOCATED IN DR KILL NOT RE(IW DR OWN FTIDR ANY CJW77C4L COURSE SEDIA(ENT VIEW AREA. SOILS NOTE: THE PROECT 91E IS ENTIRELY LOCATED KITHIN A TVF'E B IlAS9F1W AREA PER ( GROUNDWATER NOTE: DEPTH TO WATER TARE MORE THAN 80 I1S LEGEND - SUB-BASIN BOUNDARY Bx SUB-BASIN DESIGNATION SUB-BASIN AREA (ACRES) Qo> NODE ---- ....—..— FLOW PATH BASIN AREA C I QIOD Tc B-1 0.05 0.54 5.6 0.15 6.3 B-2 0.28 0.77 6.6 1.42 4.6 B-3 0.06 0.50 4.7 1 0.14 8.5 . ATTACHMENT 2 BACKUP FOR POP HYDROMODIFICATION CONTROL MEASURES [This is the cover sheet for Attachment 2.] Indicate which Items are Included behind this cover sheet: Attachment Contents Checklist Sequence Attachment 2a Hydromodification Management 9 Included Exhibit (Required) See Hydromodification Management Exhibit Checklist on the back of this Attachment cover sheet. Attachment 2b Management of Critical Coarse ® Exhibit showing project drainage Sediment Yield Areas (WMAA Exhibit boundaries marked on WMAA is required, additional analyses are Critical Coarse Sediment Yield optional) Area Map (Required) See Section 6.2 of the BMP Design Optional analyses for Critical Coarse Manual. Sediment Yield Area Determination LI 6.2.1 Verification of Geomorphic Landscape Units Onsite LI 6.2.2 Downstream Systems Sensitivity to Coarse Sediment LI 6.2.3 Optional Additional Analysis of Potential Critical Coarse Sediment Yield Areas Onsite Attachment 2c Geomorphic Assessment of Receiving 0 Not performed Channels (Optional) LI Included See Section 6.3.4 of the BMP Design Manual. Attachment 2d Flow Control Facility Design and ii Included Structural BMP Drawdown Calculations (Required) See Chapter 6 and Appendix G of the BMP Design Manual S Use this checklist to ensure the required information has been included on the Hydromodification Management Exhibit: The Hydromodification Management Exhibit must identify: ® Underlying hydrologic soil group 0 Approximate depth to groundwater Li Existing natural hydrologic features (watercourses, seeps, springs, wetlands) Li Critical coarse sediment yield areas to be protected (if present) 0 Existing topography 0 Existing and proposed site drainage network and connections to drainage offsite 0 Proposed grading 0 Proposed impervious features Li Proposed design features and surface treatments used to minimize imperviousness 0 Point(s) of Compliance (POC) for Hydromodification Management O Existing and proposed drainage boundary and drainage area to each P00 (when necessary, create separate exhibits for pre-development and post-project conditions) O Structural BMPs for hydromodification management (identify location, type of BMP, and size/detail) 0 VICINITY MAP S023'5 188.56 4ROL _____ P :•. : —2998 1—STORY '"'• ATTACHED ADU .• . .. . .• GARAGE . .: N A8KSF I A=509 SF 'H PA 88 'I I P.ECT 8rr 8WRA ROTA N TOTAL LOT AREA = 17,159 SQ/FT (0.39 Ac) TOTAL OISTURBED AREA =T9,T67 SQ/PT (0.44 AC) W(THIS AREA ITAGUJOES BUT IS NOT LIMITED IT) --STE AtRI( IFAIJI5NG PUBLIC IMPROVEMENTS ARE TEMPORARY OISTTJR8A/ACE SUCH AS VEHICLE AND EQUIPMENT STAGING AREAS ccpAsTNucTTcs'A WORKER FOOT TRAFFIC SOL/CHA9N. FILES UTTUTS TRERCHES, BA(XFTLL GUTS AND SLOPE KEYWAYS) TOTAL REPLACED TMPERWO(JS AREA -0-252 AC TOTAL PROPOSED IMPERI10EJS AREA .0.260 AC w NORTH GRAPHIC SCALE (IN PINT) Iboh lOft LOCATION MAP N7 WSE T.— EINTWO CONCRIEW STALE ALL COSTING UIIUIIES SEOWIA CR THESE PLANS ARE PLOTTED FROM TETOR) DATA AT THEIR APPRO)OMHTE LOCATCR& UNGFRTINOEND FAGUT88 MAY COST WAITS HAVE NOT BETS REPORTED OR ARE NOT OF RECORD. CONTRACTOR 549)). SERFS THE LROATTCR OF ALL PERTINENT UTTUI88 IN THE FIELD PRIER TO THE START OF CONSTRUCTION, CITY OF CARLSBAD ENGINEERING DEPARTMENT P0sr DEV!IOPWENT REED RESIDENCE - - DRAINAGE PLAIN FOR 1-475 BUENA VISTA WAY CARLSBAD, CA 92000 - ......_._ AFN 056-231-21-OS 11TTES4EET APPROVED: JASON S. GELDERT - GTE ENGINEER BEE 63912 RES 9/30/18 DATE - IDWN BY: .__—___-II PROJECT NO. IIDRA%MNG NO.' DATE INITiAL I DATE INITIAL CHKD BY: I REVISION DESCRIP11ON - 01188 APPROVAL CITE APPROVAL RVWD BY I Ii .9 OUT FALL 9 PATH POINT OF DISCHARGE CATCH II:::iET BASIN I OCATION "AS BUILT" RCE. EXP. ________ DATE REVIEWED BE W 2— EVIM C47091 B4ER REACH ID -- NAME 1 -- Santa Margarita River 2 San Luis Rey River 3 Buena Vista Creek 4 Agua Hedionda Creek 5 San Marcos Creek 6 Encinitas Creek 7 Cottonwood Creek (Carlsbad WMA) 8 Escondido Creek 9 San Dieguito Creek - Reach 1 10 San Dieguito Creek - Reach 2 11 Lusardi Creek 12 Los Penasquitos/ Poway Creek 13 Rat$tc,nakc Crcck 14 Carroll Canyon Creek 15 Rose Creek 16 San Diego River 17 Sycamore Creek 18 Woodglen Vista Creek 19 San Vicente Creek 20 Forester Creek 21 Chollas Creek 22 Sweetwater River - Reach 1 23 Sweetwater River - Reach 2 24 Otay River Jamul/ Dulzura Creek 25 26 Tijuana River 27 Cottonwood Creek (Tijuana WMA) Legend Regional WMAA Stream, Watershed Boundaries Municipal Boundaries Rivers & Streams Potential Critical Coarse Sediment Yield Areas / 1 : . ::L • I L Ir 261! 1! Potential Critical Coarse Sediment Yield Areas Regional San Diego County Watersheds Mdes0 5 10 15 - (eosyntec Exhibit Date Sept 8 2014 R1C%3 811 4124 33105N J J ' 7 .. 13133 168142 33 10'5'N MAT- 46J338 4-6, 1 C Map ScaC: 1:374 fptind on portlait (8.5 x 11") sheet. ,Meter t N o 5 10 20 33 A 60 0 15 - 30 - Map p ojecuon W.b Met hll ator rne4 ccaDrdInat WGS84 Edge tea UTM Zon DiN W USL), Natural Resources Web Soil Survey Conservatian Service National Cooperative Soil Survey Soil Map—San Diego County Area, California MAP LEGEND MAP INFORMATION Spoil Area Stony Spot Very Stony Spot Wet Spot Other .. Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography Area of Interest (AOl) Area of Interest (AOl) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features UO Blowout Borrow Pit X Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp C Mine or Quarry Miscellaneous Water o Perennial Water Rock Outcrop + Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot The soil surveys that comprise your AOl were mapped at 1:24000. Warning Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection. which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: San Diego County Area, California Survey Area Data: Version 15, May 27, 2020 Soil map units are labeled (as space allows) for map scales 1:50000 or larger. Date(s) aerial images were photographed: Jan 24, 2020—Feb 12, 2020 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. USDA Natural Resources Web Soil Survey 11/19/2020 Conservation Service National Cooperative Soil Survey Page 2 of 3 Soil Map—San Diego County Area, California Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOl Percent of AOl CcE Carlsbad-Urban land complex, 9 to 30 percent slopes 0.5 100.0% Totals for Area of Interest 0.5 100.0% USDA Natural Resources Web Soil Survey 11/19/2020 Conservation Service National Cooperative Soil Survey Page 3 of 3 S Map Unit Description: Carlsbad-Urban land complex, 9 to 30 percent slopes---San Diego County Area, California S Map Unit Description The map Units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions in this report, along with the maps, can be used to determine the composition and properties of a unit. A map Unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named, soils that are similar to the named components, and some minor components that differ in use and management from the major soils. Most of the soils similar to the major components have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Some minor components, however, have properties and behavior characteristics divergent 5 enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data. The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that have similar use and management requirements. The delineation of such segments on the map provides sufficient information for the development of resource plans. If intensive use of small areas is planned, however, onsite investigation is needed to define and locate the soils and miscellaneous areas. An identifying symbol precedes the map unit name in the map unit descriptions. Each description includes general facts about the unit and gives important soil properties and qualities. USDA Natural Resources Web Soil Survey 11/19/2020 21111111111111111 Conservation Service National Cooperative Soil Survey Page 1 of 4 Map Unit Description: Carlsbad-Urban land complex, 9 to 30 percent slopes---San Diego County Area, California Soils that have profiles that are almost alike make up a soil series. All the soils of a series have major horizons that are similar in composition, thickness, and arrangement. Soils of a given series can differ in texture of the surface layer, slope, stoniness, salinity, degree of erosion, and other characteristics that affect their use. On the basis of such differences, a soil series is divided into soil phases. Most of the areas shown on the detailed soil maps are phases of soil series. The name of a soil phase commonly indicates a feature that affects use or management. For example, Alpha silt loam, 0 to 2 percent slopes, is a phase of the Alpha series. Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes, associations, or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate pattern or in such small areas that they cannot be shown separately on the maps. The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. An association is made up of two or more geographically associated soils or miscellaneous areas that are shown as one unit on the maps. Because of present or anticipated uses of the map units in the survey area, it was not considered practical or necessary to map the soils or miscellaneous areas separately. The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha-Beta association, 0 to 2 percent slopes, is an example. An undifferentiated group is made up of two or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management. The pattern and proportion of the soils or miscellaneous areas in a mapped area are not uniform. An area can be made up of only one of the major soils or miscellaneous areas, or it can be made up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. Some surveys include miscellaneous areas. Such areas have little or no soil material and support little or no vegetation. Rock outcrop is an example. Additional information about the map units described in this report is available in other soil reports, which give properties of the soils and the limitations, capabilities, and potentials for many uses. Also, the narratives that accompany the soil reports define some of the properties included in the map unit descriptions. San Diego County Area, California CcE—Carlsbad-Urban land complex, 9 to 30 percent slopes Map Unit Setting National map unit symbol: hb9f Elevation: 30 to 300 feet Mean annual precipitation: 10 to 16 inches Mean annual air temperature: 61 to 63 degrees F Frost-free period: 330 to 350 days USDA Natural Resources Web Soil Survey 11/19/2020 Conservation Service National Cooperative Soil Survey Page 2 of 4 Map Unit Description: Carlsbad-Urban land complex, 9 to 30 percent slopes---San Diego County Area, California Farmland classification: Not prime farmland Map Unit Composition Carlsbad and similar soils: 50 percent Urban land: 30 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Carlsbad Setting Landform: Hillslopes Landform position (two-dimensional): Backslope Landform position (three-dimensional): Side slope Down-slope shape: Convex Across-slope shape: Convex Parent material: Ferruginous sandstone Typical profile HI - 0 to 21 inches: gravelly loamy sand H2 - 21 to 39 inches: loamy sand H3 - 39 to 50 inches: indurated Properties and qualities Slope: 9 to 30 percent Depth to restrictive feature: 24 to 40 inches to duripan Drainage class: Moderately well drained Runoff class: Very high Capacity of the most limiting layer to transmit water (Ksat): High (1.98 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: Very low (about 2.7 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4e Hydrologic Soil Group: B Hydric soil rating: No Description of Urban Land Typical profile HI - 0 to 6 inches: variable Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 8s USDA Natural Resources Web Soil Survey 11/19/2020 Conservation Service National Cooperative Soil Survey Page 3 of 4 Map Unit Description: Carlsbad-Urban land complex, 9 to 30 percent slopes---San Diego County Area, California Hydric soil rating: No Data Source Information Soil Survey Area: San Diego County Area, California Survey Area Data: Version 15, May 27, 2020 USDA Natural Resources Web Soil Survey 11/19/2020 Conservation Service National Cooperative Soil Survey Page 4 of 4 . ATTACHMENT 3 Structural BMP Maintenance Information Use this checklist to ensure the required information has been included in the Structural BMP Maintenance Information Attachment: Preliminary Design/Planning/CEQA level submittal: Attachment 3 must identify: El Typical maintenance indicators and actions for proposed structural BMP(s) based on Section 7.7 of the BMP Design Manual Final Design level submittal: Attachment 3 must identify: 1 Specific maintenance indicators and actions for proposed structural BMP(s). This shall be based on Section 7.7 of the BMP Design Manual and enhanced to reflect actual proposed components of the structural BMP(s) El How to access the structural BMP(s) to inspect and perform maintenance L Features that are provided to facilitate inspection (e.g., observation ports, cleanouts, silt posts, or other features that allow the inspector to view necessary components of the structural BMP and compare to maintenance thresholds) 11 Manufacturer and part number for proprietary parts of structural BMP(s) when applicable i Maintenance thresholds for BMPs subject to siltation or heavy trash(e.g., silt level posts or other markings shall be included in all BMP components that will trap and store sediment, trash, and/or debris, so that the inspector may determine how full the BMP is, and the maintenance personnel may determine where the bottom of the BMP is. If required, posts or other markings shall be indicated and described on structural BMP plans.) i Recommended equipment to perform maintenance When applicable, necessary special training or certification requirements for inspection and maintenance personnel such as confined space entry or hazardous waste management 0 r fldi ng depth Overflow Mulch (Top Soil) Chapter : Storm Water Pollutant Control Requirements for PDPs 5.5.2 Partial Retention BMP Category Partial retention category is defined by structural measures that incorporate both infiltration (in the lower treatment zone) and biofiltration (in the upper treatment zone). Example includes biofiltration with partial retention BMP. 5.5.2.1 Biofiltration with Partial Retention BMP Biofiltration with partial retention BMPs are shallow basins filled with treatment media and drainage rock that manage storm water runoff through infiltration, evapotranspiration, and biofiltration. These BMPs are characterized by a subsurface stone infiltration storage zone in the bottom of the BMP below the elevation of the discharge from the underdrains. The discharge of biofiltered water from the underdrain occurs when the water level in the infiltration storage zone exceeds the elevation of the underdrain outlet. The storage volume can be controlled by the elevation of the underdrain outlet (shown in Figure 5-8), or other configurations. Other typical biofiltration with partial retention components include a media layer and associated filtration rates, drainage layer with associated in- situ soil infiltration rates, and vegetation. Selection: Biofiltration with partial retention BMP shall be selected if the project site feasibility analysis performed according to Section 5.4.2 determines a partial infiltration feasibility condition. Design: Appendix B.5 provides guidance for sizing biofiltration with partial retention BMP and Appendix E provides a fact sheet to design biofiltration with partial retention BMP. BMP option under this category: . PR-1: Biofiltration with partial retention Inflow via surface Energy disIp\aiqr)/stone Perforated flow or pipe inlet Engineered soil medium th/ckness .... Filter Course Stone storage layer thickness Layer Infiltration Figure 5-8. Schematic of a Typical Biofiltration with Partial Retention BMP 5-15 The City of San Diego I Storm Water Standards I October 2018 Edition SD Part 1: BMP Design Manual Chapter 7: Long Term Operation & Maintenance Table 7-5. Maintenance Indicators and Actions for Detention BMPs Poor vegetation establishment Re-seed, re-establish vegetation. Overgrown vegetation Mow or trim as appropriate. Erosion due to concentrated Repair/re-seed/re-plant eroded areas and adjust the irrigation irrigation flow system. Repair/re-seed/re-plant eroded areas and make appropriate Erosion due to concentrated storm corrective measures such as adding erosion control blankets, water runoff flow adding stone at flow entry points, or re-grading where necessary. Accumulation of sediment, litter, or Remove and properly dispose of accumulated materials. debris Make appropriate corrective measures such as adjusting Standing water irrigation system, removing obstructions of debris or invasive vegetation, or minor re-grading for proper drainage. Obstructed inlet or outlet structure Clear obstructions. Damage to structural components such as weirs, inlet or outlet Repair or replace as applicable. structures 7-11 The City of San Diego I Storm Water Standards I October 2018 Edition Part 1: BMP Design Manual ATTACHMENT 4 City standard Single Sheet BMP (SSBMP) Exhibit [Use the City's standard Single Sheet BMP Plan.] [IJ WON POSr WH W MKOK NW WSIE WI1ff CONTROL Bs TnI. MAW ANO SlMGE riM SPBI PWWION AND cL riM CON W MANAGEMEXr NSW MANAGEWff Nam IBM FM M AM A LOB. ENIk I AV ISMARBERML MPE USE ff MM lOB A SFEM SON CITY OF CARLSBAD SHEEIS 6 ENGINEERING DEPARTMENT 6 EROSION CONTROL REED RESIDENCE ' 1375 BUENA VISTA WAY CARLSBAD, CA 92008 APN: 155-231-21-00 11111 SHEET APPROVED: JASON S. GELDERT CITY ENGINEER RE 83912 OPIRES 9/30/18 DATE OWN BY: __SL__ PRO.ECT NO. DRANNG NO. GHKD BY: ....i!_.... RVWD BY: 0 tRIM SI1EI87IH WE1 FADW z NEEOM WMW WRE MESH SUP SIEflOR- WOW PT NUFM SLT FENCE SHALL BE PLACEO ON SLOPE COMM10 mAlum PtIC EVNC!. POW NC .:. FENCE AM EACH SFEI EVEPif NC . SED&flff iei IlY. 9 (225m) MIXIM S ff. 3 FSOM SEDUM 9W]. BE EVPO9TED 1DM MA lINT WLL 1871 co.mit SLDa OFF-91E NO ONI BE PBaVMMY FL iVU8 0 m 1% NORTH GRAPHIC SCALE (N FT) lioh - loft - 1' PWO.ECT DESCRPTIM I. DEMCAJEN CAlSIINO MAIN ON€LLIN($ GARAGE AND ADU 2 PMDROZ) NEW 014€WNC NEW G4R4/a'F1cz NEW 0.RA(E/$KS°ICP, NEW ADU ZONING R-7 LEGAL PM? 7159 PAR I AFt! 756.237.27.00 cc8vSmijcllc8v TIME N-B OCCUPANCY a.A56 RJ/LI SPRINKLERS iss PRoposiv BUIWNO NEI(21T 24-O DEVOUSM MAIN 043€WHO 986w GARA7JE I,440 ADU 552w TOTAL Z978 SWEICXLIR4L LOT COVERAGER, LOT f7,JJ6SF x 40% ALLOWABLE 6934w OI,€RALL PROPOSED COVERAGE, SQUARE mOTA• 2-STORY 013€LLIVO &064S' 4OIO. (IF 1.8434UF 2 767w) ATTACHED G.41E4OC 509_ G4RA/13tWK91LP 660 660S' 1-STORY A.D.U. 640SF 6405 TOTAL 19.4% 4364W AW95w SETBAam FRLWT 20' BDE 9202' + 9207' &5 — 92075' x .70 - 9.2075' REAR. 92015'x .20 — 76.405' g1E l NEW I*€7!W0US C1J4E1E DRIVEWAY AREA 4562w NEW IMPERVIOUS CONCRETE` YARD AREA 3080B' NEW IMPERVIOUS B(IILLW4G AREA 4364 * TOTAL 61SK 77,008w VICINITY MAP LEGEND SUB-BASIN BOUNDARY xx SUB-BASIN DESIGNATION XX SUB-BASIN AREA (ACRES) NODE FLOW PATH BASIN AREA C I QIOO Tc A-1 0.17 0.66 6.6 0.74 5.0 A-2 0.22 0.71 6.1 0.96 5.5 8JD4A VWA 0 NORTH GRAPHIC SCALE (of PEEr) 1ih- loft. [fl CITY OF CARLSBAD [ [__J ENGINEERING DEPARTMENT - PEE DEVEIOPI&ENT REED RESIDENCE DRAINAGE PLAN 7016 1375 BUENA VISTA WAY CARLSBAD, CA 92008 APN: 156-231-21-00 TITLE SHEET APPROVED: JASON S. GELDERT COY ENGINEER RCE 83912 EXPIRES 9/30/18 DATE I DAN BY: PROJECT NO. DRANNG NO. CHKD BY: RWID BY: THE 6A1S17N0 g7E IS CURRENTLY IN (1ELDR€D CCWOIII0NS THE SURFACE RUNOFF KILL CONVEY AND A'SQIARCc DIRECTLY INTO A VDRE1E BASIN LOCA lED IN BUENA VISTA WAY. lYE RUNOFF KILL FLOW OOP#tISIREAM INTO A S7M DRAW CHANNEL LOCA7EL IN PlO PICO DOVE AND FiNALLY DISCHARGED TO BUENA VISTA DRWC CCSYA NOTE: THE PRO.ECT IS NOT LOCA lED IN LW HILL NOT RECEIW LW DRAIN FROM ANY CR17TM COURSE DMENT ND AREA. SOILS NOTE: WE PR(AECT STE IS EN11Y LOCA lED IW774IN A TYPE B CLASSIFIED AREA PER NRCS DEPTH TO WATER TABLE: MORE IHAN 80 INDIES VICINITY MAP R PROT 8ff SOHA VETA JI 0 0 0 AS LEGEND - SUB-BASIN BOUNDARY Bx SUB-BASIN DESIGNATION SUB-BASIN AREA (ACRES) NODE PATH BASIN AREA C I QIOO Tc B-1 0.05 0.54 5.6 0.15 6.3 B-2 0.28 0.77 6.6 1.42 4.6 B-3 0.06 0.50 4.7 0.14 8.5 4_ø PIPE cLE.4NOUT NUN CAP 410 WVL INVERT PER PLAN ZTGNT 6 AIW ..._ TWO RON5 OF HE -- j' av 5 f2 AND 120 ANGLE APART PFE TQ RISTALLED NUN HOLES PLACED ArBOrrcld. -. --------------- 3 TOTAL LOT AREA =17,159 SQ/FT (0.39 Ac) c TOTAL DISIIJRBW AREA 19,167 SQ/FT (044 Ac) 0 (11415 AREA INGI.UOES BUT IS NOT UMIIED TO Z LRF-GITE WORK INULNNG PUBLIC IMPROIEMEN15 AND TEMPORARY DISTURBANCE SIJOI AS VEHICLE AND EQUIPMENT STAGING AREAS; CONSTRUCTION WORKER FOOT TRAFFIC. SC(L/ENA EEL PILES. UTILITY '- TRENCHES. BACRFTLL CUTS AND SLOPE KEYWAYS) TOTAL REPLACED IMPERPOTJS AREA 0,252 Ac TOTAL PROPOSED IMPERWDUS AREA 0.26O Ac PROPOSED DRAINAGE SUMMARY WE PROPOSED gTE NfLL DRAIN WE RUNORT IDWARUS THE ORIL1ITAT1Y 617K PARTiAL RETENTION BASIN AT THE NORTH EAST CORNER OR THE gir WA (.WDERLWAIN PIPES THE PROPOSED 94gw KILL PO WOE BOTH WATER QUALITY IRE4ThIENT AND PLOW CONTROL TREATMENT; THE DISCHARGE KILL ENTER THE UN.CROUND STtW*I SYSTEM 1I2WOUI THE DRAINAGE BARN LOCATED IN BUENA WSTA WAY AND CQflEY TD BUENA WSTA atEEK 10 FiNALLY LIAROE INTO THE pAaFIc OCEAN . E WORKSHEET FOR WdP 52WG CAL WLA TraYS CCSYA NOTE: 3 THE PR06ECT IS NOT LOCATED IN DR KILL NOT RECEIW DR DRAIN FROM ANY CRITICAL covRsE smmEmr VIEW ARE4. SOILS NOTE: THE PRO.ECT SITE IS ENTIRELY LOCATED REiN/N A TYPE B aAS9'FTED AA PER NRCS GROUNDWATER NOTE: DEPTH 10 WATER TAaE MORE THAN 80 VIES NORM GRAPHIC SCALE (IN FlIT) 1h 102%. SHEET CITY OF CARLSBAD SHEETS ENGINEERING DEPARTMENT POST DEVELOPMENT REED RESIDENCE DRAINAGE PLAN )Vlt 1375 BUENA VISTA WAY CARLSBAD, CA 92008 APN: 156-231-21-00 liRE SHEET APPROVED: JASON S. GELDERT CITY ENGINEER RCE 63912 EXPIRES 9/30/16 DATE DNA BY: PROJECT NO. DRARING NO. CH/lD BY:................ RVWD BY: . ATTACHMENT Drainage Study I ARK CIVIL + STRUCTURAL DRAINAGE STUDY PREPARED FOR: REED RESIDENCE APN: 156-231-21-00 1375 Buena Vista Way Carlsbad, CA 92008 October 20, 2020 PREPARED BY: LAMAR Engineering, Inc. Civil + Structural 217 Landis Avenue Chula Vista, CA 91910 IN www.lamareng.com 217 Landis Avenue, Chula Vista, CA. 91910. TABLE OF CONTENTS Page No. Introduction 3 Proposed Improvements 3 Hydrology Analysis and Methodology of Existing Conditions 3 Hydrology Analysis and Methodology of Proposed Conditions 3 Hydrologic Results 4 Conclusions 5 References 5 Vicinity & Location Map 6 EXHIBITS "1": Exhibit Watershed Basins 8 APPENDICES Appendix "A": Hydrologic Calculations - Rational Method 9 Developed Condition 100-Year Appendix "B": Hydrologic Calculations - Rational Method 9 Developed Condition 100-Year Appendix "C": Detention Basin Calculations 9 Appendix "D": References 12 2 INTRODUCTION General This report presents a drainage study for the property located at along Buena Vista Way, east of San Diego Freeway, west of the Elmwood St. with an APN: 156-231-21-00 (Project) in the City of Carlsbad, California. The purpose of this report is to estimate storm runoff discharges and appropriately design the proposed drainage improvements associated with the referenced property. The 100-year event will be considered for both the existing and proposed conditions. Proposed Improvements The proposed improvements include grading to accommodate a two-story single-family residence with attached two-car garage, a detached garage/workshop & an ADU both at the rear of the property, and hardscape improvements. The project site currently consists of a lot with an existing front asphalt concrete driveway, a one-story dwelling unit, a 2- car garage and an ADU which will be demolished to accommodate the proposed private improvements. The proposed drainage system will mimic the existing drainage pattern and basins designated to determine the runoff amounts and to properly size any drainage systems, if required. Drainage improvements are proposed to convey runoff associated with the project. The proposed drainage improvements will include a bioretention channel at the front of the property to collect the runoff from the property and allow detention and infiltration into the existing ground and any overflow to be convey by a 3" underdrain pipe into an existing concrete basin. Hydrology Analysis and Methodology of Existing Conditions The Rational Method was used to calculate the 100-year peak storm flows for the existing subbasin. A weighted Runoff Coefficient (C) of 0.71 was determine for each existing subbasin for the percentage of develop type (Table 1). A time of concentration (Tc) was determine for each subbasin. The existing project site drainage area is approximately 0.39 acres. The site drainage area will be discharged northerly towards Buena Vista Way. Hydrology Analysis and Methodology of Proposed Conditions As with the existing drainage conditions, the Rational Method was used to calculate the peak flows from the proposed subbasins. Again, in Appendix D, the guidelines and parameter used for the Rational Method can be found. A weighted Runoff Coefficient (C) was determine for each existing subbasin for the percentage of develop type (Table 2). A time of concentration (Tc) was determine for each subbasin. 3 Subbasin B-i (0.05 ac) drainage area consist of a detached garage/workshop, an ADU and landscape drainage. This area sheet will flow southerly and captured into landscape. Subbasin B-2 (0.28 ac) drainage area consist of new concrete driveway, a proposed two- story residence with attached garage, new hardscape and landscape. Partial flow will convey into a proposed 3'x 3' vegetated swale and deposited on a 2'x2' catch basin .The remaining basin area sheet will convey from hardscape into two different proposed 2'x2' catch basins. The three proposed catch basins will finally convey into a 8'xi5' biofiltration basin. Subbasin B-3 (0.06 ac) drainage area consist of a concrete driveway, hardscape and landscape areas. This basin area sheet flows partially northly into landscape, the remaining basin will discharge directly into Buena Vista Way. The runoff captured by the biofiltration basin will be conveyed into an existing concrete basin by a 3" underdrain pipe. HYDROLOGIC RESULTS The Rational Method Hydrologic calculations for the 100-year, 6-Hour Storm Events, existing and proposed, are shown in Appendix "A" and "B", respectively. The following table presents a summary of the design storm runoff calculations: Table 1: Existing Drainage Conditions- QCIA Sub- Basin Runoff Coeficient (C) Area (Acres) Tc (mm.) 100 yr Storm Intensity (I) Q1 00 (cfs) A-1 0.66 0.170 5.00 6.6 0.74 A-2 0.71 0.220 5.58 6.1 0.96 TOTAL 0.390 1.70 Table 2: Proposed Drainage Conditions - QCIA Sub- Basin Runoff Coeficient (C) Area (Acres) Tc (mm.) 100 yr Storm Intensity (I) Q1 00 (cfs) B-1 0.54 0.050 6.35 5.6 0.15 B-2 0.77 0.280 4.69 6.6 1.42 B-3 0.50 0.060 8.57 4.7 0.14 TOTAL 0.390 1.71 Summary (100-Year): Existing Conditions Total Area = 0.39 AC Total Flow = 1.70 cfs 4 Proposed Conditions Total Area = 0.39 AC Total Flow= 1.71 cfs *Difference in runoff Q=0.01 cfs (increase) CONCLUSIONS Analysis of the existing and proposed conditions have been performed, and the finding establish as shown on the hydrologic analysis results. As noted on the summary hydrologic table, the difference between the post and pre- development flows will be capture on a bioretention basin located in the front side of the property. Partial flow will convey to Buena Vista Way by sheet flow through the driveway and the rest of the flow will be conveyed to Buena Vista Way from an existing concrete Basin by an imderdrain pipe. Therefore, no impact to the downstream conditions exists. In addition, no increase in erosion or siltation will occur as the project is implemented LID in the form of landscape area and dispersion of runoff into the proposed detention basin. The proposed two-story single-family residence is outside a SFHA (Special Flood Hazard Area) zone (Zone X); The proposed grading improvements pad elevation of 132.75 for the main garage, 133.50 for the main residence, 132.50 for the detached garage/workshop and 132.50 for the ADU, will be rise in elevation and therefore will not be impacted by the 100-year flood zone. Similarly, this proposed does not proposed any significant risk of loss, injury or death involving flooding. REFERENCES County of San Diego, San Diego County Hydrology Manual (2003) Accurate Land Survey, Topographic Survey (December 2007) 0 S VICINITY I/?JP LEUCADIA BL VD co PROJECT SITE a: Ti 0 Cj \ \t ci w \\ a \\ I \\ NORTH VDCIIIITY MAP N TS S EXHIBIT 661" WATERSHED BASINS 0 PWO,ECT pT1aiz I. OEMWI EXISTING MAIN DNELLJNG, GARAGE AND Aol! 2 PROPOSED NEW DMELJ.1N6 NEW CARAOE/06FItZ NEW G4RAOC/$ILWK9ICP. NEW AO(L ZcWING R-1 LEGAL P6(17159 PAR I AR! 156.231.21.00 cel4s7Ruc7Ic.v TYPE V-B OCCUPANCY CLASS P3/ti SPR#wajws FLW0D BUILDING HEIGHT 24!O MAIN ONEWNG 986el' GARAOC 1,440.% Aol! TOTAL Z978 STRUCTURAL LOT COVERAGE, LOT 17336W x 40% ALLOWABLE 6,934DI COVERAGE, O€R4LL SQUARE FOOT -40E, 2-STORY DNELLWG Z064el 4010el (ZF 1,8434-UP 2.167el) ATTACHED GARAGE 509el GARAOE/NQVKILW 660% 560DI l-STLWY A.D.U. 6405 5405 TOTAL 19.4% .364% Aefw FROND 20' elDR 9202' + 9201'x5 — 92015' x .10 — 9.2075' REAR. 92015' x.20 - 16.405' NEW IAERWOUS CQYLWETE DRftEWAY AREA 4562% a NEW IMPER Walls CDRLWE1E YARD AREA jLOmF *NEW IMPER WallS BUILIXNG AREA 364% * TOTAL 65.0% 11.006% - VICINITY MAP SXA VWA LEGEND - = SUB-BASIN BOUNDARY xx SUB-BASIN DESIGNATION XX SUB-BASIN AREA (ACRES) NODE —u...—..—FLOW PATH BASIN AREA C I QIOO Tc A-1 0.17 0.66 6.6 0.74 5.0 A-2 0.22 0.71 6.1 0.96 5.5 EXISTING DRAINAGE SUMMARY: THE E3QSIING STE is CURRE7ÜLY IN 06EL(PED CQYOI1TCVS SURFACE R(/NQT KILL CQVWY AND DISCHARGE DlREC!7LY INTO A CONCRE7E'BASN LOCATED IN BUENA W$TA WAY. THE RUNOFF MILL FLOW DONW$IREAM INTO A STOW DRAIN CHANNEL LOC.47a IN Pt0 FICO ORW AND FINALLY LVSIAR(JED TO BUENA WSTA CREEK. CCSYA NOTE: THE PPO.ET)T IS NOT LOCATED IN LW KILL NOT RET.TETIE LW DRAIN FROM ANY QRITYCAL COURSE 56D74BVT ND AREA. SOILS NOTE: THE PRO.ZCT ellE IS BV7TRY LOCATED NI 1MN A TYPE B CLAS9FIED AREA PER NRcS GROUNDWATER NOTE: DEPTH TO WATER TAKE, MORE THAN 80 INCHES 0 NORTH ORAPHIC SCALE (DI PEE?) Iich — LO ft. SHEET CITY OF CARLSBAD SH ENGINEERING DEPARTMENT PRE DEVELOPMENT REED RESIDENCE DRAINAGE PlAN FOR 1375 BUENA VISTA WAY CARLSBAD, CA 92008 APN: 156-231-21-00 1111.5 SHEET APPROVED JASON S. GflDERT CITY ENGINEER RCE 63912 EXPIRES 9/30/18 DATE OWN BY. PROJECT NO. DRAWING NO. 1.HKD BY:_........... RVWD BY: 4•ø PFIE EANOUT MIlK CAP 4-. NOW-A TED pv ___ 0 NORTH GRAPHIC SCALE (N ruT) 1th0h loft AS NE4RY 1.8107H AS__/j WTLET -- PWQ WATER t TRBIT 4L NVERT PER PLAN - 6 PM0WWMA7=W FM 7EV ROW OF HES -- 5 AND 120 ANIlE APART PFE TV aaINSTALLED MIlK HOLES PLACED AT BOTTZ BIORETENTION BASIN BUS SHEET CITY OF CARLSBAD TS I ENGINEERING DEPARTMENT POST DEVEIDPMENT REED RESIDENCE DRAINAGE PLAN POR 1375 BUENA VISTA WAY CRRLSBSD, CA 92008 1TTLE EN EET 156-231-21-00 APPROVED: JASON S. GELDERT CITY ENCINEER RCE 63912 EXPIRES 9/30/18 DATE OWN BY: PROJECT NO. DRAWING NO. CHKD BY:.___. RVWD BY: — VICINITY MAP PHOT 8m 9688 VETA Alp - TOTAL LOT AREA =17.159 SC/FT (0.39 Ac) I ' C) TOTAL DISTURBED AREA - 19.167 SQINT (0.44 Ac) 0 (THIS AREA INU0ES BUT IS NOT UNITED TO LPF-9TE WORK INWJD(NQ PUBLIC IMPR0EDAEN1S Z c t AND TEMPORARY DISTURBANCE SUCH AS 89110E AND EQUIPMENT STATENG AREAS crj4SmlJcTToN WORKER FOOT TRAFFIC S /ENAI€L PILES. UITLIfl' "- TRENCHES. BAENFTLL CUTS AND RiPE KEYWAYS) TOTAL. REPLACED IMPERVIOUS AREA =0252 Ac TOTAL. PROPOSED IMPEl? WOOS AREA =0.260 Ac PROPOSED DRAINAGE SUMMARY THE PRoposEv SITE HILL DRAIN THE RUNOFF TOWARDS THE CW1LTRAT7CW P11TH PARTIAL RETENTILW BASIN AT THE NCINIH EAST CORNER OR THE sTE WA (.WD4IN PIPEr. THE PROPOSED BASIN HILL PPIO WOE BOTH WATER QUALITY TREATMENT AND PLOW CQVTRCI. TREAThIENT THE DISCHARGE HILL ENTER THE UN0UND SICEIM iP..._4 S)S7U.V TAWOUGH THE DRAINAGE 84N LOCATED IN BUENA WSTA WAY AND CQVWY TO BUENA VISTA CREEK IV FINALLY DISCHARGE INTO THE PAO'FIC OCEAN SEE NORKSHEL7 FOR INIP 5ZNG CAL QULA TIC*VS. CCSYA NOTE: THE PRO.ECT IS NOT LOCATED UI OR HILL NOT RECETW OR CETAIN FROM ANY CRITICAL COURX SEDIAWVT flEID AREA. SOILS NOTE: THE PRG.ECT STE IS ENTIRELY LOCATED II? THIN A TYPE B aASS°PTED AREA PER NRCS. ç GROUNDWATER NOTE: DEPTH TV WATER TAKE, UCWE THAN 80 RICES H ~j -D 0 0 LEGEND - SUB-BASIN BOUNDARY E xx SUB-BASIN DESIGNATION XX SUB-BASIN AREA (ACRES) NODE —............FLOWPATH BASIN AREA C I QIOO Tc B-1 0.05 0.54 5.6 0.15 6.3 B-2 0.28 0.77 6.6 1.42 4.6 B-3 1 0.06 0.50 4.7 1 0.14 8.5 S APPENDIX "A" HYDROLOGY CALCULATIONS RATIONAL METHOD PRE-DEVELOPED CONDITION (EXISTING) 100-YEAR 0 100-year (Existing) Rational Method Flowrate Calculations Project: I REED RESIDENCE I Subarea:I A-I I Date:l 10/20/201 STREAM #1 ______ _ NODES [ 132fl TO 1130T r(FLOW ACROSS THE INITIAL SUBAREA) Area Subarea (A): Enter: Al =[ 0.170 1 acres Soil Type = [T (Appendix A SDCHM) ImpervousAl =1 0.102 7 acres Impervous Al % =1 Pervous Al =1 0.07 I acres Coefficient of Runoff (C): Enter: C =1 066 I (Table 3-1 of San Diego County Hydrology Manual) Slope (s): Enter: s =1 12.0 7(enter percentage, not decimal value) Watercourse Distance (D): Enter: D = 100 Ifeet Enter D(adjusted) = 100 feet Initial Overland Flow (ti): Ti = 1.8*(1.1C)*D 2 s113 TjI 3.5 _Iminutes 6-hr Storm Precipitation (P6): Enter: p6-I_2.5 _linches P6(adjusted)r _2.50 Iinches Intensity of Rainfall (I): = 744*p*T 0.645 =1 6.6 u in/hr (Table 3-2 of the Hydrology Manual) Ti minimum= 5 minutes 24-hr Storm Precipitation (P24): (Hydrology Manual - 100 Year Rainfall-24 Hours) Enter: P24 J 4.7 jinches P6/P24= 53.1915 % 0.95392 Discharge (Q) at Node I 130 Q = Q1_0.74 Icfs 0 100-year (Existing) Rational Method Flowrate Calculations Project: J REED RESIDENCE I Subarea: I A-2 I Date: I 10/20/20 I STREAM #1 NODES I 132 TO r -—i LFL0W ACROSS THE INITIAL SUBAREA) Area Subarea (A): Enter: A2 = 1 0.220 Impervous A2 =ro —i PervousA2=I 0.07 acres Soil Type = acres Impervous A2 % = acres (Appendix A SDCHM) Coefficient of Runoff (C): Enter: C =1 0.71 I (Table 3-1 of San Diego County Hydrology Manual) Slope (s): Enter: s =[ 2.0 1(enter percentage, not decimal value) Watercourse Distance (D): Enter: D = 88 lfeet Enter D(adjusted) = 100 feet Initial Overland Flow (ti): Ti = 1.8*(1.1C)*D 2 s113 TjI 5.6 Iminutes 6-hr Storm Precipitation (F6): Enter: P6= 2.5 ]inches P6 (adjusted) 2.50 Inches Intensity of Rainfall (I): I = 744*P*T 0.645 1 =1 6.1 uin/hr (Table 3-2 of the Hydrology Manual) Ti minimum= 5 minutes 24-hr Storm Precipitation (F24): (Hydrology Manual - 100 Year Rainfall-24 Hours) Enter: P24= [•1 inches P6/P24= 53.1915 % 0.95392 Discharge (Q) at Node I 131 Q= CIA, QI 0.96 Icfs 0 S APPENDIX "B" HYDROLOGY CALCULATIONS RATIONAL METHOD POST-DEVELOPED CONDITION (PROPOSED) 100-YEAR 0 100-year (Proposed) Rational Method Flowrate Calculations Project: I REED RESIDENCE I Subarea: I B-I I Date: 10/20/20 I STREAM #1 ____ NODES 1 132 T TO r131 L LOW ACROSS THE INITIAL SUBAREA)] Area Subarea (A): Enter: Bi =1 0.05 T acres Soil Type = FC-1 (Appendix A SDCHM) Impervous Bi =1 0.021 acres Impervous Bi % = 40% Pervous Bi =1 0.03 I acres Coefficient of Runoff (C): Enter: C I 0.54 (Table 3-1 of San Diego Country Hydrology Manual) Slope (s): Enter: s = 4.0 (enter percentage, not decimal value) Watercourse Distance (D): Enter: D = 25 Ifeet Enter D(adjusted) = F 100 feet Initial Overland Flow (t): = 1 .8*(1. 1 _C)*D 2 Ti I 6.4 Iminutes 6-hr Storm Precipitation (P6): Enter: P6= [2.5 inches P6 (adjusted) 2.50 inches Intensity of Rainfall (I): = 744*P*T 0.645 =1 5.6 u in/hr (Table 3-2 of the Hydrology Manual) Ti minimum= 5 minutes 24-hr Storm Precipitation (P24): (Hydrology Manual - 100 Year Rainfall-24 Hours) Enter: P24 [_4.7] inches P6/P24= 53.1915 % 0.95392 Discharge (Q) at Node I 131 Q = Ci'A1 Q1 0.15 Icfs 0 100-year (Proposed) Rational Method Flowrate Calculations Project:REED RESIDENCE I Subarea'. I B-2 I Date: I 10/20/20 I STREAM #1 NODES 1331 TO _ 1 ____ 31 i [JrLWAos THE INITIAL SUBAREA)] Area Subarea (A): Enter: B2=[ 0.28 acres Soil Type =r C 1 (Appendix A SDCHM) ImpervousB2[ 0.22 acres Impervous B2 % =1 Pervous B2 =1 0.060 I acres Coefficient of Runoff (C): Enter: C = 0.77 I (Table 3-1 of San Diego Country Hydrology Manual) Slope (s): Enter: s =1 2.0 1(enter percentage, not decimal value) Watercourse Distance (D): Enter: D =1 95 feet Enter D(adjusted) = 100 feet Initial Overland Flow (t): Ti = 1.8*(1.1C)*D 2 S s113 Ti l " Iminutes 6-hr Storm Precipitation (P6): Enter: P6 - 1 inches 6 (adjusted)= 1 2.50 inches Intensity of Rainfall (I): I = 744*P*T 0.645 1 =1 6.6 in/hr (Table 3-2 of the Hydrology Manual) Ti minimum= 5 minutes 24-hr Storm Precipitation (P24): (Hydrology Manual - 100 Year Rainfall-24 Hours) Enter: p 4=[4.7linches P6/P24= 53.1915 % 0.95392 Discharge (Q) at Node I 131 Q CVA1 Q=I 1.42 Icfs 0 100-year (Proposed) Rational Method Flowrate Calculations Project:J REED RESIDENCE I Subarea: I B-3 I Date:I 10/20/20 I STREAM #1 _______ _________________ NODES [ 133 TO 11 [7ftöw ACROSS THE INITIAL SUBAREA)] Area Subarea (A): Enter: B3= 0.06 1 acres Soil Type =11 (Appendix A SDCHM) 1mpervousB3=[ 0.02 1 acres Impervous B3 % =1 PervousB3=I 0.04 I acres Coefficient of Runoff (C): Enter: C 0.50 I (Table 3-1 of San Diego Country Hydrology Manual) Slope (5): Enter: s =r 2.0 1(enter percentage, not decimal value) Watercourse Distance (D): Enter: D J 33 ifeet Enter D(adjusted) = 100 feet Initial Overland Flow (ti): = 1.8*(1.1_C)*D 2 . S1/3 Ti=I 8.6 Iminutes 6-hr Storm Precipitation (P6): Enter: P6 2.5 ]inches P6 (adjusted)= 2.50 inches Intensity of Rainfall (I): I = 744*p*T0.645 1=1 4.7 ui n/hr (Table 3-2 of the Hydrology Manual) Ti minimum= 5 minutes 24-hr Storm Precipitation (P24): (Hydrology Manual - 100 Year Rainfall-24 Hours) Enter: P24 14.7linches P6/P24= 53.1915 % 0.95392 Discharge (Q) at Node I 132.5 I Q= CA Q1 0.14 Icfs 0 APPENDIX "C" DETENTION BASIN CALCULATION S 10 S SDHM 3.1 PROJECT REPORT Project Name: Biofiltration Basin Reed Site Name: Reed Residence Site Address: 1375 Buena Vista Way City : Carlsbad, CA 92008 Report Date: 10/26/2020 Gage : BONITA Data Start : 10/01/1971 Data End : 09/30/2004 Precip Scale: 1.00 Version Date: 2020/04/07 Low Flow Threshold for POC 1 : 50 Percent of the 2 Year High Flow Threshold for POC 1: 10 year PREDEVELOPED LAND USE Name : Basin A Bypass: No GroundWater: No Pervious Land Use acre C,NatVeg,Moderate .14 Pervious Total 0.14 Impervious Land Use acre IMPERVIOUS-FLAT 0.25 Impervious Total 0.25 Basin Total 0.39 Element Flows To: Surface Interf low Groundwater MITIGATED LAND USE Name : Bypass: No GroundWater: No S Pervious Land Use acre u,rlatveg,lxloaerate .1.5 Pervious Total 0.13 Impervious Land Use acre IMPERVIOUS-FLAT 0.26 Impervious Total 0.26 Basin Total 0.39 Element Flows To: Surface Interflow Groundwater Surface retention 1 Surface retention Name : Bioretention 1 Bottom Length: 15.00 ft. Bottom Width: 8.00 ft. Material thickness of first layer: 1.5 Material type for first layer: Mulch Material thickness of second layer: 1.5 Material type for second layer: ESM Material thickness of third layer: 1 Material type for third layer: GRAVEL Underdrain used Underdrain Diameter (feet): 0.5 Orifice Diameter (in.): 0.4 Offset (in.): 0.15 Flow Through Underdrain (ac-ft.): 2 . 733 Total Outflow (ac-ft.): 4.891 Percent Through Underdrain: 55.88 Discharge Structure Riser Height: 0.5 ft. Riser Diameter: 12 in. Element Flows To: Outlet 1 Outlet 2 Bioretention 1 Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) Infi1t(cfs) 0.0000 0.0028 0.0000 0.0000 0.0000 0.0549 0.0028 0.0000 0.0000 0.0000 0.1099 0.0028 0.0001 0.0000 0.0000 0.1648 0.0028 0.0001 0.0000 0.0000 0.2198 0.0028 0.0002 0.0000 0.0000 . 0.2747 0.0028 0.0002 0.0000 0.0000 0.3297 0.0028 0.0003 0.0000 0.0000 S 0.3846 0.0028 0.0003 0.0000 0.0000 0.4396 0.0028 0.0004 0.0000 0.0000 0.4945 0.0028 0.0004 0.0000 0.0000 0.5495 0.0028 0.0005 0.0000 0.0000 0.6044 0.0028 0.0005 0.0002 0.0000 0.6593 0.0028 0.0005 0.0003 0.0000 0.7143 0.0028 0.0006 0.0004 0.0000 0.7692 0.0028 0.0006 0.0004 0.0000 0.8242 0.0028 0.0007 0.0005 0.0000 0.8791 0.0028 0.0007 0.0006 0.0000 0.9341 0.0028 0.0008 0.0007 0.0000 0.9890 0.0028 0.0008 0.0007 0.0000 1.0440 0.0028 0.0009 0.0007 0.0000 1.0989 0.0028 0.0009 0.0010 0.0000 1.1538 0.0028 0.0010 0.0010 0.0000 1.2088 0.0028 0.0010 0.0010 0.0000 1.2637 0.0028 0.0010 0.0010 0.0000 1.3187 0.0028 0.0011 0.0011 0.0000 1.3736 0.0028 0.0011 0.0012 0.0000 1.4286 0.0028 0.0012 0.0013 0.0000 1.4835 0.0028 0.0012 0.0014 0.0000 1.5385 0.0028 0.0013 0.0015 0.0000 1.5934 0.0028 0.0013 0.0016 0.0000 1.6484 0.0028 0.0014 0.0017 0.0000 1.7033 0.0028 0.0014 0.0017 0.0000 1.7582 0.0028 0.0015 0.0018 0.0000 1.8132 0.0028 0.0015 0.0019 0.0000 1.8681 0.0028 0.0015 0.0020 0.0000 S 1.9231 0.0028 0.0016 0.0020 0.0000 1.9780 0.0028 0.0016 0.0021 0.0000 2.0330 0.0028 0.0017 0.0021 0.0000 2.0879 0.0028 0.0017 0.0022 0.0000 2.1429 0.0028 0.0018 0.0023 0.0000 2.1978 0.0028 0.0018 0.0023 0.0000 2.2527 0.0028 0.0019 0.0024 0.0000 2.3077 0.0028 0.0019 0.0024 0.0000 2.3626 0.0028 0.0020 0.0025 0.0000 2.4176 0.0028 0.0020 0.0026 0.0000 2.4725 0.0028 0.0020 0.0026 0.0000 2.5275 0.0028 0.0021 0.0027 0.0000 2.5824 0.0028 0.0021 0.0027 0.0000 2.6374 0.0028 0.0022 0.0028 0.0000 2.6923 0.0028 0.0022 0.0028 0.0000 2.7473 0.0028 0.0023 0.0028 0.0000 2.8022 0.0028 0.0023 0.0029 0.0000 2.8571 0.0028 0.0024 0.0029 0.0000 2.9121 0.0028 0.0024 0.0030 0.0000 2.9670 0.0028 0.0025 0.0030 0.0000 3.0220 0.0028 0.0025 0.0031 0.0000 3.0769 0.0028 0.0026 0.0031 0.0000 3.1319 0.0028 0.0026 0.0031 0.0000 3.1868 0.0028 0.0027 0.0032 0.0000 3.2418 0.0028 0.0028 0.0032 0.0000 3.2967 0.0028 0.0028 0.0033 0.0000 3.3516 0.0028 0.0029 0.0033 0.0000 3.4066 0.0028 0.0030 0.0034 0.0000 3.4615 0.0028 0.0030 0.0034 0.0000 . 3.5165 0.0028 0.0031 0.0034 0.0000 3.5714 0.0028 0.0031 0.0035 0.0000 3.6264 0.0028 0.0032 0.0035 0.0000 3.6813 0.0028 0.0033 0.0035 0.0000 3.7363 0.0028 0.0033 0.0036 0.0000 3.7912 0.0028 0.0034 0.0037 0.0000 3.8462 0.0028 0.0035 0.0038 0.0000 3.9011 0.0028 0.0035 0.0039 0.0000 3.9560 0.0028 0.0036 0.0040 0.0000 4.0000 0.0028 0.0036 0.0087 0.0000 Surface retention 1 Hydraulic Table Stage(feet) Area(ac.) Volume(ac-ft.) Discharge(cfs) To mended(cfs) Wetted Surface 4.0000 0.0028 0.0036 0.0000 0.0087 0.0000 4.0549 0.0028 0.0038 0.0000 0.0087 0.0000 4.1099 0.0028 0.0039 0.0000 0.0087 0.0000 4.1648 0.0028 0.0041 0.0000 0.0087 0.0000 4.2198 0.0028 0.0042 0.0000 0.0087 0.0000 4.2747 0.0028 0.0044 0.0000 0.0087 0.0000 4.3297 0.0028 0.0045 0.0000 0.0087 0.0000 4.3846 0.0028 0.0047 0.0000 0.0087 0.0000 4.4396 0.0028 0.0048 0.0000 0.0087 0.0000 4.4945 0.0028 0.0050 0.0000 0.0087 0.0000 4.5495 0.0028 0.0051 0.1165 0.0087 0.0000 4.6044 0.0028 0.0053 0.3555 0.0087 0.0000 4.6593 0.0028 0.0054 0.6597 0.0087 0.0000 4.7143 0.0028 0.0056 0.9966 0.0087 0.0000 4.7692 . 0.0028 0.0058 1.3333 0.0087 0.0000 4.8242 0.0028 0.0059 1.6378 0.0087 0.0000 4.8791 0.0028 0.0061 1.8845 0.0087 0.0000 4.9341 0.0028 0.0062 2.0620 0.0087 0.0000 4.9890 0.0028 0.0064 2.1826 0.0087 0.0000 5.0000 0.0028 0.0064 2.3230 0.0087 0.0000 Name : Surface retention 1 Element Flows To: Outlet 1 Outlet 2 Bioretention 1 ANALYSIS RESULTS Predeveloped Landuse Totals for POC #1 Total Pervious Area:0.14 Total Impervious Area:0.25 Mitigated Landuse Totals for POC #1 Total Pervious Area:0.13 Total Impervious Area:0.26 Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow (cfs) 2 year 0.120361 5 year 0.165578 10 year 0.176619 25 year 0.248669 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow (cfs) 2 year 0.104035 5 year 0.151714 10 year 0.165352 25 year 0.234884 POC #1 The Facility PASSED The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail 0.0602 143 98 68 Pass 0.0614 131 92 70 Pass 0.0625 0.0637 123 116 88 82 71 70 Pass Pass 0.0649 110 78 70 Pass 0.0661 102 73 71 Pass 0.0672 96 69 71 Pass 0.0684 90 67 74 Pass 0.0696 85 65 76 Pass 0.0708 84 63 75 Pass 0.0719 82 61 74 Pass 0.0731 73 59 80 Pass 0.0743 69 58 84 Pass 0.0755 66 56 84 Pass 0.0766 64 53 82 Pass 0.0778 59 52 88 Pass 0.0790 58 50 86 Pass 0.0802 57 46 80 Pass 0.0814 57 44 77 Pass 0.0825 54 42 77 Pass 0.0837 52 40 76 Pass 0.0849 49 38 77 Pass 0.0861 45 37 82 Pass 0.0872 45 34 75 Pass 0.0884 42 33 78 Pass 0.0896 40 32 80 Pass 0.0908 39 31 79 Pass 0.0919 39 30 76 Pass 0.0931 39 30 76 Pass 0.0943 38 30 78 Pass • 0.0955 38 30 78 Pass 0.0966 37 26 70 Pass S 0.0978 34 24 70 Pass 0.0990 32 23 71 Pass 0.1002 30 22 73 Pass 0.1013 27 20 74 Pass 0.1025 27 19 70 Pass 0.1037 26 19 73 Pass 0.1049 25 16 64 Pass 0.1061 24 16 66 Pass 0.1072 24 16 66 Pass 0.1084 23 16 69 Pass 0.1096 23 16 69 Pass 0.1108 22 14 63 Pass 0.1119 22 14 63 Pass 0.1131 21 13 61 Pass 0.1143 21 13 61 Pass 0.1155 21 13 61 Pass 0.1166 21 13 61 Pass 0.1178 19 13 68 Pass 0.1190 17 13 76 Pass 0.1202 17 13 76 Pass 0.1213 14 12 85 Pass 0.1225 13 11 84 Pass 0.1237 11 10 90 Pass 0.1249 10 10 100 Pass 0.1260 10 10 100 Pass 0.1272 10 10 100 Pass 0.1284 10 9 90 Pass 0.1296 10 9 90 Pass • 0.1307 10 9 90 Pass 0.1319 9 9 100 Pass 0.1331 9 9 100 Pass 0.1343 9 9 100 Pass 0.1355 9 9 100 Pass 0.1366 9 9 100 Pass 0.1378 9 9 100 Pass 0.1390 9 9 100 Pass 0.1402 9 9 100 Pass 0.1413 9 9 100 Pass 0.1425 9 9 100 Pass 0.1437 9 9 100 Pass 0.1449 9 9 100 Pass 0.1460 9 9 100 Pass 0.1472 9 9 100 Pass 0.1484 9 8 88 Pass 0.1496 8 7 87 Pass 0.1507 8 7 87 Pass 0.1519 8 6 75 Pass 0.1531 7 6 85 Pass 0.1543 7 5 71 Pass 0.1554 7 5 71 Pass 0.1566 7 4 57 Pass 0.1578 7 4 57 Pass 0.1590 7 4 57 Pass 0.1602 7 4 57 Pass 0.1613 7 4 57 Pass S 0.1625 7 3 42 Pass 0.1637 7 3 42 Pass 0.1649 7 3 42 Pass . 0.1660 6 3 50 Pass 0.1672 6 3 50 Pass 0.1684 6 2 33 Pass 0.1696 5 2 40 Pass 0.1707 5 2 40 Pass 0.1719 4 1 25 Pass 0.1731 4 1 25 Pass 0.1743 3 1 33 Pass 0.1754 3 1 33 Pass 0.1766 3 1 33 Pass Drawdown Time Results Perind and Impind Changes No changes have been made. This program and accompanying documentation are provided as-is without warranty of any kind. The entire risk regarding the performance and results of this program is assumed by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business interruption, . and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright © by Clear Creek solutions, Inc. 2005-2020; All Rights Reserved. 0 APPENDIX "D" REFERENCES 11 • ; - p FEMA Nation. Flood Hazard Layer FlRMette 11712 '0! 33'10'21"N 4 V - 1. • - jp7o~ w *TO N\1Lt4fJ & goal ELo:EAZARL: - Z4'4-_J 1 iii SI iq , 1,- (i .1,1 I 11111 1 SAN L1W AA ,A7 Ile \ I Tt"F-i1''*. 1' 40 AA 0 250 500 1.000 1.500 2,000 :o uuu Legend SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT I Without Base Flood Elevation (BFE) Zvn,, A. V. 459 SPECIAL FLOOD I With BEE or Depth zo,e AE 40 AH VS. AR HAZARD AREAS i Regulatory Floodway 0.2% Annual Chance Flood Hazard, Area of 1% annual chance flood with average depth less than one foot or with drainag areas of less than one square mile Future Conditions 1% Annual Chance Flood Hazard Z. Area with Reduced Flood Risk due to OTHER AREAS OF I Levee. See Notes. FLOOD HAZARD I Area with Flood Risk due to Levee: NO SCREEN Area of Minimal Flood Hazard I I Effective L0MRs OTHER AREAS Area of Undetermined Flood Hazard = GENERAL - - - - Channel, Culvert, or Storm Sewer STRUCTURES 11111111 Levee. Dike, or Floodwall Cross Sections with 1% Annual Chance i.LI Water Surface Elevation - Coastal Transect 't — Base Flood Elevation Line (BEE) Limit of Study Jurisdiction Boundary Coastal Transect Baseline OTHER - - Profile Baseline FEATURES ________ Hydrographic Feature Digital Data Available No Digital Data Available MAP PANELS Unmapped ¶ The pin displayed on the map is an approximat€ point selected by the user and does not represe an authoritative property location. This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 10/1/2020 at 6:54 PM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time. This map image is void if the one or more of the following map elements do not appear: basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers. FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. San Diego County Hydrology Manual Section: 3 Date: June 2003 Page: 60f26 Table 3-1 RUNOFF COEFFICIENTS FOR URBAN AREAS Land Use I Runoff Coefficient "C" -- Soil Type NRCS Elements County Elements % IMPER. A B C D Undisturbed Natural Terrain (Natural) Permanent Open Space 0.20 0.25 0.30 0.35 Low Density Residential (LDR) Residential, 1.0 DU/A or less 10 0.27 0.32 0.36 0.41 Low Density Residential (LDR) Residential, 2.0 DU/A or less 20 0.34 0.38 0.42 0.46 Low Density Residential (LDR) Residential, 2.9 DU/A or less 25 0.38 0.41 0.45 0.49 Medium Density Residential (MDR) Residential, 4.3 DU/A or less 30 0.41 0.45 0.48 0.52 Medium Density Residential (MDR) Residential, 7.3 DU/A or less 40 0.48 0.51 0.54 0.57 Medium Density Residential (MDR) Residential, 10.9 DU/A or less 45 0.52 0.54 0.57 0.60 Medium Density Residential (MDR) Residential, 14.5 01)/A or less 50 0.55 0.58 0.60 0.63 High Density Residential (HDR) Residential, 24.0 DU/A or less 65 0.66 0.67 0.69 0.71 High Density Residential (HDR) Residential, 43.0 DU/A or less 80 0.76 0,77 0.78 0.79 Commercial/Industrial (N. Corn) Neighborhood Commercial 80 0.76 0.77 0.78 0.79 Commercial/Industrial (G. Corn) General Commercial 85 0.80 0.80 0.81 0.82 Commercial/Industrial (O.P. Corn) Office Professional/Commercial 90 0.83 0.84 0.84 0.85 Commercial/Industrial (Limited 1.) Limited Industrial 90 0.83 0.84 0.84 0.85 Commercial/Industrial (General I) General Industrial 95 0.87 0.87 0.87 0.87 *The values associated with 0% impervious may be used for direct calculation of the runoff coefficient as described in Section 3.1.2 (representing the pervious runoff coefficient, Cp, for the soil type), or for areas that will remain undisturbed in perpetuity. Justification must be given that the area will remain natural forever (e.g., the area is located in Cleveland National Forest). DU/A = dwelling units per acre NRCS = National Resources Conservation Service 3-6 U) W I- I- Ui LU 2 U 0 20 Ui z - o z LU 0 -j Ui U, LL 10 L) LU Ui 0 EXAMPLE: Given: Watercourse Distance (D) = 70 Feet Slope (s)1.3% T= 1.8(1.1-C)\1b Runoff Coefficient (C) = 0.41 Overland Flow Time (T) = 9.5 Minutes SOURCE: Airport Drainage, Federal Aviation Administration, 1965 FIGURE Rational Formula - Overland Time of Flow Nomograph 3=3 ____ 100 WUWAW~=30 S San Diego County Hydrology Manual Date: June 2003 Section: 3 Page: 12of26 [1 Note that the Initial Time of Concentration should be reflective of the general land-use at the upstream end of a drainage basin. A single lot with an area of two or less acres does not have a significant effect where the drainage basin area is 20 to 600 acres. Table 3-2 provides limits of the length (Maximum Length (LM)) of sheet flow to be used in hydrology studies. Initial T1 values based on average C values for the Land Use Element are also included. These values can be used in planning and design applications as described below. Exceptions may be approved by the"Regulating Agency" when submitted with a detailed study. Table 3-2 MAXIMUM OVERLAND FLOW LENGTH (LM) & INITIAL TIME OF CONCENTRATION (T.' Element* DU/ Acre .5% 1% 2% 3% 5% 10% LM F LM Ti LM Ti LM Ti LM TiLM Ti Natural 50 13.2 70 12.5 85 10.9 100 10.3 100 8.7 100 6.9 LDR 1 50 12.2 70 11.5 85 10.0 100 9.5 100 8.0 100 6.4 LDR 2 50 11.3 70 10.5 85 9.2 100 8.8 100 7.4 100 5.8 LDR 2.9 50 10.7 70 10.0 85 8.8 95 8.1 100 7.0 100 5.6 MDR 4.3 50 10.2 70 9.6 80 8.1 95 7.8 100 6.7 1 100 5.3 MDR 7.3 50 9.2 65 8.4 80 7.4 95 7.0 100 6.0 100 4.8 MDR 10.9 50 8.7 65 7.9 80 6.9 90 6.4 100 5.7 100 4.5 MDR 14.5 50 8.2 65 7.4 80 6.5 90 6.0 100 5.4 100 4.3 HDR 24 50 6.7 65 6.1 75 5.1 90 4.9 95 4.3 100 3.5 HDR 43 50 5.3 65 4.7 75 4.0 85 3.8 95 3.4 100 2.7 N. Corn 50 5.3 60 4.5 75 4.0 85 3.8 95 3.4 100 2.7 G. Corn 50 4.7 60 4.1 75 3.6 85 3.4 90 2.9 100 2.4 O.P./Corn 50 4.2 60 3.7 70 3.1 80 2.9 90 2.6 100 2.2 Limited 1. 50 1 4.2 60 3.7 70 3.1 80 2.9 90 2.6 100 2.2 General!. 50 1 3.7 60 3.2 70 2.7 80 1 2.6 90 2.3 100 1.9 *See Table 3-1 for more detailed description 3-12 [i: S EQUATION LE T 111.9L3\O.365 Feet C - - IE) -5000 Tc = Time of concentration (hours) L a Watercourse Distance (miles) -4000 LE = Change In elevation along effective slope line (See Figure 3-5)(feet) —3000 Tc Hours Minutes —2000 4 240 - 3 180 —1000 900 800 120 100 2T71, o _500\\ 0 400 0 1--60 -300 -50 -200 -40 I \ Miles Feet -30 -100 4000 -20 - N —18 - —3000 —16 0.5-- -50 -14 -40 ......2000 -12 -1600 -1600 \ -10 -30 -1400 \ —9 -1200 —a -20 -1000 -7 -900 -800 -6 - 700 5 -600 -10 -500 -4 0' 1-200 L Ic SOURCE: California Division of Highways (1941) and Kirpich (1940) FIGURE Nomograph for Determination of Time of Concentration (Tc) or Travel Time (It) for Natural Watersheds II 'LI ti. I.s 9 9-.. FIG U RE 3-6 Gutter and Roadway Discharge - Velocity Chart — — — --- w-!a.mr, —ra - A VAR!!4 Al 4wuI. T A i WA WMUII 1W IU. F__IIIW. WWUWA YAUSII AU AiUI I — All __ A I m W ____________ MINOR 'V fl_____ r ____________ ______ _____ __ IA 'AIUUI A_ uii lI 0, A I- — — ) County of San Diego - 33030 Hydrology Manual 3303Q.°f Count iiii * 01 Riverside County c 5.' it 11 U B — Rainfall Isopluvials 33 15 100 Year Rainfall Event - 6 Hours OCEANSIDEU - -. '• ' [J - IsopIuvial (inches) SITE LOCATION 1D -.•---', ___ P6:2.5 CARLSBAD .--- 's:c ___) '/ - - O ENCINITAS' I 'S I'•th°: - 33 00 33°00 ------- 0 SONA BCR DEL MA 0 J pow4 '? 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'-tiri DII.Thtt ( csüLd' N THIS MAP IS PROVIDED WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Copyright SarrGIS. XI Rights Reserved. This products may contain irrtorreaborr from the SANDAG Regevol E information System which cannot be reproduced arthoul the written permission of SANDAG This product may contain information which has been reproduced with permission granted by Thomas Brothers Maps. S 3 0 3MiIes Soil Hydrologic Groups 3315' 33°OO' 2 1111 EQ EQ C Leaend Soil (3roup Group A Group B Group C Group Undetermined Data Unavailable dil- MeXi ED ED CD C) 33°3 Orange O -- County I : V. I Riverside County / -- V.-: , Wr.~;4 "\ r I f - -/ 3315 - V \ TA- OCEui. .,' :. . V •W SITE LOCATION SCO1DDQ 5 GROUP C CARl AF - ., ENCINITAS cAwl SOLANABEAC\ pj y ( S.D. 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