The URL can be used to link to this page

Home My WebLink AboutCDP 2019-0015; SAUER RESIDENCE; DRAINAGE STUDY FOR RESIDENTIAL REMODEL AND ASSOCIATED SITE IMPROVEMENTS - 2465 JEFFERSON STREET; 2021-09-01DRAINAGE STUDY FOR RESIDENTIAL REMODEL AND ASSOCIATED SITE IMPROVEMENTS – 2465 Jefferson Street Prepared for: Carefree Holdings, LLC CDP2019-0015 DWG 531-3A / GR2021-0015 September 2021 Prepared by: __________________________ John L. Majocha RCE 81240 Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 2 METHODOLOGY AND PROCEDURE 1) The 85th percentile rainfall value for the site is 0.59 inches per Figure B.1-1 of the Carlsbad BMP Design Manual. 2) The on-site soils are characterized as hydrologic soil group of “B” per Section IV. B. of the Geotechnical Update and Site/Grading Plan Review, Proposed New Building Additions and Rear Site Improvements, 2465 Jefferson Street, Carlsbad, California dated April 30. 2020. Site NRCS soil information is included in Appendix B. 3) The runoff coefficient “C” was selected based on estimated percent imperviousness of each sub area and Table B-1.1 of the Carlsbad BMP Design Manual. Runoff coefficient and Design Control Volume calculations are provided in Appendix C. 4) The proposed permeable pavers have been sized to treat the 85th percentile rainfall volume due to development of the site. T paver section volume calculations are included in Appendix D of this report. 5) The proposed permeable paver base sections have been designed to have a drawdown time of less than 36 hours per the requirements indicated in Section B.4.1 of the Carlsbad BMP Design Manual. The design infiltration rate was determined by applying a safety factor to the observed infiltration rate from the NRCS Survey information. The safety factor was determined using information in Tables D.5-1 and D.5-2 and Form I-9 in the Carlsbad BMP Design Manual. Design infiltration rate information and drawdown calculations are included in Appendix E of this report. 6) The proposed storm drain analysis was performed for the 100-year storm event with Hydraflow Storm Sewers Extension for Autodesk Civil 3D 2019. The results of the storm drain analysis are included in Appendix F of this report. 7) The proposed swale along the southern side of the building has been provided to collect runoff generated by Area F shown on the Pipe Drainage Areas Map in Appendix F. The drainage swale calculations are provided in Appendix G. These calculations support the drainage improvements associated with the remodel and associated site improvements to the residence located at 2465 Jefferson Street. The proposed site drainage will maintain existing drainage patterns. Area A will include a portion of the roof area and the proposed permeable paver driveway. 85th percentile runoff generated from proposed improvements in Area A will infiltrate into the proposed permeable pavers. Runoff from larger storm events will discharge to the Jefferson Street curb and gutter similar to existing conditions. Area B includes the remainder of the roof area, the proposed patio and associated pool, pedestrian permeable paver walkways, and various site landscaped areas. 85th percentile runoff generated from the proposed improvements will infiltrate into the various proposed permeable paver walkways. Runoff from larger storm events and the remainder Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 3 of Area B will drain to the existing area drains located on the western portion of the site similar to existing conditions. Site runoff is not increased under proposed conditions as depicted on the tables included with the drainage area maps depicting the existing and proposed on-site drainage areas are included in Appendix A. Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 3 APPENDIX A DRAINAGE MAP CONC. SIDEWALKSTEPS STEPS EACAC AC N 89°58'20" E 230.29'N 18°42'32" E 120.46'S 87°00'19" W 269.35'S 00°02'00" E 100.14'RETAINING WALLWITH CHAINLINKFENCE LSA EXIST. GATE JEFFERSON STREETCLOHLOHLOHLEXIST. CURB EXIST. BOUNDARY EXIST. BOUNDARY EXIST. BOUNDARY (25)(30)(35)(40)(45)(50)(55)(60 )(65)(30)(35)(40)(45)(50)(55)(60)(65)(68)(67 ) (6 7 ) (66)(64)(67)(67)M EXIST. MULTI-FAMILY RESIDENTIAL HOUSINGBUENA VISTA LAGOONEXIST. BUILDING AC PARKING STALL (TYP.)CONCSTEPS CONC POOLEQUIPMENT LSA 25.00 ' 25.00 ' EXISTI N G 2 5 ' A C C E S S E A S E M E N T REC. D E C . 0 9 , 2 0 1 4 AS D O C . # 2 0 1 4 - 0 5 4 2 5 9 4 N 24°53'11" E 19.19'N 24°53'11" E 120.08'S 24°53'11" W 32.42'N 24°53'11" E 121.70'118.67'27.57'84.05'WETLAND LIMIT LINEWETLAND LIMIT LINE100 YEAR FLOOD PLAIN BOUNDARY LINE (ZONE A)GATE (15)(9)EXIST. BUILDING EXIST. BUILDING PROP O S E D 2 5 ' A C C E S S E A S E M E N T PER P R 2 0 2 1 - 0 0 0 3 SCALE: 1" = 20' NORTHREGISTERED P ROFESSIONAL E NGI NEERCIVI LJOHN L . MAJO CHASTATE OF CALI F O R N IA E N 89°58'20" E 230.29'N 18°42'32" E 120.46'S 87°00'19" W 269.35'S 00°02'00" E 100.14'JEFFERSON STREETCLOHLOHLOHLEXIST. BOUNDARY EXIST. BOUNDARY (25)(30)(35)(40)(45)(50)(55)(60 )(65)(30)(35)(40)(45)(50)(55)(60)(65)(68)(67 ) (6 7 ) (66)(64)(67)(67)BUENA VISTA LAGOONN 24°53'11" E 19.19'N 24°53'11" E 120.08'S 24°53'11" W 32.42'N 24°53'11" E 121.70'118.67'27.57'84.05'WETLAND LIMIT LINEWETLAND LIMIT LINE100 YEAR FLOOD PLAIN BOUNDARY LINE (ZONE A)(15)(9)SCALE: 1" = 20' NORTHREGISTERED P ROFESSIONAL E NGI NEERCIVI LJOHN L . MAJO CHASTATE OF CALI F O R N IA Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 4 APPENDIX B NRCS SOIL SURVEY INFORMATION Soil Map—San Diego County Area, California Natural Resources Conservation Service Web Soil SurveyNational Cooperative Soil Survey 4/15/2021Page 1 of 336701483670154367016036701663670172367017836701843670148367015436701603670166367017236701783670184467456467462467468467474467480467486467492467498467504467510 467456 467462 467468 467474 467480 467486 467492 467498 467504 467510 33° 10' 11'' N 117° 20' 56'' W33° 10' 11'' N117° 20' 54'' W33° 10' 10'' N 117° 20' 56'' W33° 10' 10'' N 117° 20' 54'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 0 10 20 40 60Feet 0 4 8 16 24Meters Map Scale: 1:271 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot 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 The soil surveys that comprise your AOI were mapped at 1:24,000. 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 ServiceWeb 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, CaliforniaSurvey Area Data: Version 15, May 27, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 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. Soil Map—San Diego County Area, California Natural Resources Conservation Service Web Soil SurveyNational Cooperative Soil Survey 4/15/2021Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI MlC Marina loamy coarse sand, 2 to 9 percent slopes 0.1 20.1% TeF Terrace escarpments 0.2 79.9% Totals for Area of Interest 0.3 100.0% Soil Map—San Diego County Area, California Natural Resources Conservation Service Web Soil SurveyNational Cooperative Soil Survey 4/15/2021Page 3 of 3 Depth to Water Table—San Diego County Area, California Natural Resources Conservation Service Web Soil SurveyNational Cooperative Soil Survey 4/15/2021Page 1 of 336701483670154367016036701663670172367017836701843670148367015436701603670166367017236701783670184467456467462467468467474467480467486467492467498467504467510 467456 467462 467468 467474 467480 467486 467492 467498 467504 467510 33° 10' 11'' N 117° 20' 56'' W33° 10' 11'' N117° 20' 54'' W33° 10' 10'' N 117° 20' 56'' W33° 10' 10'' N 117° 20' 54'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 11N WGS84 0 10 20 40 60Feet 0 4 8 16 24Meters Map Scale: 1:271 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons 0 - 25 25 - 50 50 - 100 100 - 150 150 - 200 > 200 Not rated or not available Soil Rating Lines 0 - 25 25 - 50 50 - 100 100 - 150 150 - 200 > 200 Not rated or not available Soil Rating Points 0 - 25 25 - 50 50 - 100 100 - 150 150 - 200 > 200 Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. 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 ServiceWeb 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, CaliforniaSurvey Area Data: Version 15, May 27, 2020 Soil map units are labeled (as space allows) for map scales 1:50,000 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. Depth to Water Table—San Diego County Area, California Natural Resources Conservation Service Web Soil SurveyNational Cooperative Soil Survey 4/15/2021Page 2 of 3 Depth to Water Table Map unit symbol Map unit name Rating (centimeters)Acres in AOI Percent of AOI MlC Marina loamy coarse sand, 2 to 9 percent slopes >200 0.1 20.1% TeF Terrace escarpments >200 0.2 79.9% Totals for Area of Interest 0.3 100.0% Description "Water table" refers to a saturated zone in the soil. It occurs during specified months. Estimates of the upper limit are based mainly on observations of the water table at selected sites and on evidence of a saturated zone, namely grayish colors (redoximorphic features) in the soil. A saturated zone that lasts for less than a month is not considered a water table. This attribute is actually recorded as three separate values in the database. A low value and a high value indicate the range of this attribute for the soil component. A "representative" value indicates the expected value of this attribute for the component. For this soil property, only the representative value is used. Rating Options Units of Measure: centimeters Aggregation Method: Dominant Component Component Percent Cutoff: None Specified Tie-break Rule: Lower Interpret Nulls as Zero: No Beginning Month: January Ending Month: December Depth to Water Table—San Diego County Area, California Natural Resources Conservation Service Web Soil SurveyNational Cooperative Soil Survey 4/15/2021Page 3 of 3 Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 5 APPENDIX C RUNOFF COEFFICIENT AND DCV CALCULATIONS 0.90 0.14 2,436 SF 0 SF 2,436 SF 0.06 ACRES 0.90 108 CF 0.90 0.14 4,076 SF 5,433 SF 9,509 SF 0.22 ACRES 0.47 218 CF 0.59 IN Figure B.1-1 of the Carlsbad BMP Design Manual dated February 2016 Design Control Volume (DCV) = Landscape Area = Total Area = Total Area = Weighted C Factor = 85th Percentile, 24-hour rainfall (d) = AREA B Roofs, Concrete, or Asphalt (C) =Table B.1-1 of the Carlsbad BMP Design Manual dated February 2016Natural B Soil (C) = Impervious Area = SAUER RESIDENCE DCV CALCULATIONS 30-Mar-2021 Total Area = Weighted C Factor = Total Area = Existing Design Control Volume AREA A Roofs, Concrete, or Asphalt (C) = Natural B Soil (C) = Table B.1-1 of the Carlsbad BMP Design Manual dated Februaray 2016 Impervious Area = Landscape Area = Figure B.1-1 of the Carlsbad BMP Design Manual dated February 2016IN0.5985th Percentile, 24-hour rainfall (d) = Design Control Volume (DCV) = 0.90 0.14 0.10 1,326 SF 310 SF 952 SF 2,588 SF 0.06 ACRES 0.51 65 CF 0.90 0.14 0.10 4,435 SF 3,648 SF 1,274 SF 9,357 SF 0.21 ACRES 0.49 228 CF 85th Percentile, 24-hour rainfall (d) = 0.59 IN Figure B.1-1 of the Carlsbad BMP Design Manual dated February 2016 Design Control Volume (DCV) = Impervious Area = Permeable Paver Area = Total Area = Total Area = Weighted C Factor = Landscape Area = Weighted C Factor = 0.59 IN Figure B.1-1 of the Carlsbad BMP Design Manual dated February 2016 Design Control Volume (DCV) = 85th Percentile, 24-hour rainfall (d) = Impervious Area = Landscape Area = Permeable Paver Area = Total Area = Total Area = AREA B Roofs, Concrete, or Asphalt (C) = Table B.1-1 of the Carlsbad BMP Design Manual dated Februaray 2016 Natural B Soil (C) = Permeable Pavers (C) = Roofs, Concrete, or Asphalt (C) = Table B.1-1 of the Carlsbad BMP Design Manual dated Februaray 2016Permeable Pavers (C) = SAUER RESIDENCE DCV CALCULATIONS 30-Mar-2021 Proposed Design Control Volume AREA A Natural B Soil (C) = Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 6 APPENDIX D PAVER SECTION VOLUME CALCULATIONS 952 SF 2 IN 0.17 FT 48 CF 8 IN 0.67 FT 254 CF 301 CF 1,274 SF 2 IN 0.17 FT 64 CF 4 IN 0.33 FT 170 CF 234 CF Base Course Thickness = Base Course Thickness = Volume in Base Course =Assumes 40% Void Ratio Total Paver Storage Volume = Permeable Paver Area = Bedding Course Thickness = Bedding Course Thickness = Volume in Bedding Course =Assumes 30% Void Ratio Total Paver Storage Volume = Proposed Drainage Area B Bedding Course Thickness = Volume in Bedding Course = SAUER PAVER VOLUME CALCULATIONS 30-Mar-2021 Permeable Paver Area = Bedding Course Thickness = Proposed Drainage Area A Assumes 30% Void Ratio Base Course Thickness = Base Course Thickness = Volume in Base Course =Assumes 40% Void Ratio Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 7 APPENDIX E INFILTRATION RATE, SAFETY FACTOR, AND PAVER DRAWDOWN TIME CALCULATIONS Appendix I: Forms and Checklists I-7 February 2016 Factor of Safety and Design Infiltration Rate Worksheet Form I-9 Factor Category Factor Description Assigned Weight (w) Factor Value (v) Product (p) p = w x v A Suitability Assessment Soil assessment methods 0.25 Predominant soil texture 0.25 Site soil variability 0.25 Depth to groundwater / impervious layer 0.25 Suitability Assessment Safety Factor, SA = p B Design Level of pretreatment/ expected sediment loads 0.5 Redundancy/resiliency 0.25 Compaction during construction 0.25 Design Safety Factor, SB = p Combined Safety Factor, Stotal= SA x SB Observed Infiltration Rate, inch/hr, Kobserved (corrected for test-specific bias) Design Infiltration Rate, in/hr, Kdesign = Kobserved / Stotal Supporting Data Briefly describe infiltration test and provide reference to test forms: Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods B-18 February 2016 B.4.1 Simple Method Stepwise Instructions: 1. Compute DCV using Worksheet B.4-1. 2. Estimate design infiltration rate using Form I-9 in Appendix I. 3. Design BMP(s) to ensure that the DCV is fully retained (i.e., no surface discharge during the design event) and the stored effective depth draws down in no longer than 36 hours. Worksheet B.4-1: Simple Sizing Method for Infiltration BMPs Simple Sizing Method for Infiltration BMPs Worksheet B.4-1 1 DCV (Worksheet B.2-1) DCV= cubic-feet 2 Estimated design infiltration rate (Form I-9 in Appendix I) Kdesign= in/hr 3 Available BMP surface area ABMP= sq-ft 4 Average effective depth in the BMP footprint (DCV/ABMP) Davg= feet 5 Drawdown time, T (Davg *12/Kdesign) T= hours 6 Provide alternative calculation of drawdown time, if needed. Notes: ≠ Drawdown time must be less than 36 hours. This criterion was set to achieve average annual capture of 80% to account for back to back storms (See rationale in Section B.4.3). In order to use a different drawdown time, BMPs should be sized using the percent capture method (Section B.4.2). ≠ The average effective depth calculation should account for any aggregate/media in the BMP. For example, 4 feet of stone at a porosity of 0.4 would equate to 1.6 feet of effective depth. ≠ This method may overestimate drawdown time for BMPs that drain through both the bottom and walls of the system. BMP specific calculations of drawdown time may be provided that account for BMP-specific geometry. PERMEABLE PAVERS PROPOSED DRAINAGE AREA A 65 1.6 952 0.07 0.53 Appendix B: Storm Water Pollutant Control Hydrologic Calculations and Sizing Methods B-18 February 2016 B.4.1 Simple Method Stepwise Instructions: 1. Compute DCV using Worksheet B.4-1. 2. Estimate design infiltration rate using Form I-9 in Appendix I. 3. Design BMP(s) to ensure that the DCV is fully retained (i.e., no surface discharge during the design event) and the stored effective depth draws down in no longer than 36 hours. Worksheet B.4-1: Simple Sizing Method for Infiltration BMPs Simple Sizing Method for Infiltration BMPs Worksheet B.4-1 1 DCV (Worksheet B.2-1) DCV= cubic-feet 2 Estimated design infiltration rate (Form I-9 in Appendix I) Kdesign= in/hr 3 Available BMP surface area ABMP= sq-ft 4 Average effective depth in the BMP footprint (DCV/ABMP) Davg= feet 5 Drawdown time, T (Davg *12/Kdesign) T= hours 6 Provide alternative calculation of drawdown time, if needed. Notes: ≠ Drawdown time must be less than 36 hours. This criterion was set to achieve average annual capture of 80% to account for back to back storms (See rationale in Section B.4.3). In order to use a different drawdown time, BMPs should be sized using the percent capture method (Section B.4.2). ≠ The average effective depth calculation should account for any aggregate/media in the BMP. For example, 4 feet of stone at a porosity of 0.4 would equate to 1.6 feet of effective depth. ≠ This method may overestimate drawdown time for BMPs that drain through both the bottom and walls of the system. BMP specific calculations of drawdown time may be provided that account for BMP-specific geometry. PERMEABLE PAVERS PROPOSED DRAINAGE AREA B 228 1.6 1274 0.18 1.35 Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 9 APPENDIX F SITE STORM DRAIN ANALYSIS E N 89°58'20" E 230.29'N 18°42'32" E 120.46'S 87°00'19" W 269.35'S 00°02'00" E 100.14'JEFFERSON STREETCLOHLOHLOHLEXIST. BOUNDARY EXIST. BOUNDARY (25)(30)(35)(40)(45)(50)(55)(60 )(65)(30)(35)(40)(45)(50)(55)(60)(65)(68)(67 ) (6 7 ) (66)(64)(67)(67)BUENA VISTA LAGOONN 24°53'11" E 19.19'N 24°53'11" E 120.08'S 24°53'11" W 32.42'N 24°53'11" E 121.70'118.67'27.57'84.05'WETLAND LIMIT LINEWETLAND LIMIT LINE100 YEAR FLOOD PLAIN BOUNDARY LINE (ZONE A)(15)(9)SCALE: 1" = 20' NORTHREGISTERED P ROFESSIONAL E NGI NEERCIVI LJOHN L . MAJO CHASTATE OF CALI F O R N IA 178 SF 373 SF 551 SF 128 SF 300 SF 428 SF 56 SF 0 SF 56 SF SAUER RESIDENCE PIPE C-VALUE CALCULATIONS 28-Sep-2021 PIPE AREA C-VALUES Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.69 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA A AREA B Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.71 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA C Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.25 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) 208 SF 0 SF 208 SF 419 SF 362 SF 781 SF 712 SF 809 SF 1,521 SF AREA E Pervious Area C-Value (Cp)= 0.25 AREA D Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.25 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.55 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA F Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.60 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) 0 SF 292 SF 292 SF 0 SF 372 SF 372 SF 0 SF 412 SF 412 SF Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.90 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA G Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B AREA H Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.90 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA I Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.90 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) 0 SF 392 SF 392 SF 0 SF 487 SF 487 SF 188 SF 9 SF 197 SF AREA K Pervious Area C-Value (Cp)= 0.25 Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.28 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.90 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA J Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.90 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA L Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B 143 SF 365 SF 508 SF 340 SF 92 SF 432 SF 87 SF 33 SF 120 SF Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.43 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA N AREA M Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.72 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = Impervious Area = Total Area = Weighted C-Value = 0.39 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area C-Value (Cp)= 0.25 AREA O 119 SF 57 SF 176 SF Impervious Area = Total Area = Weighted C-Value = 0.46 Weighted Runoff Coefficient Equation in Section 3.1.2 of the 2003 San Diego County Hydrology Manual (C=0.90*(% Impervious)+Cp*(1-% Impervious) AREA P Pervious Area C-Value (Cp)= 0.25 Per Table 3-1 of the 2003 San Diego County Hydrology Manual , LDR, Soil Type B Pervious Area = 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual 100-Year Precipitation (P6) = SAUER RESIDENCE Pipe Intensity Calculations 9/28/2021 I = 7.44P 6 D^-0.645 PROP-AREA A 10-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA B PROP-AREA C 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA D 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA E 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min PROP-AREA F 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA G 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA H 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA I 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA J 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA K 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min 2.66 inches 5.00 min PROP-AREA P 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA O 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA N 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA L 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual PROP-AREA M 100-Year Precipitation (P6) = Duration (D) = Rainfall Intensity (I) =7.01 in/hr I = 7.44P6D^-0.645 Figure 3-1 of the San Diego Hydrology Manual Hydraflow DOT Report1LineToLineLineLengthIncr.AreaTotalAreaRunoffCoeff.IncrC x ATotalC x AInletTimeTimeConcRnfalIntTotalRunoffAdnlFlowTotalFlowCapacFullVelocPipeSizePipeSlopeInv ElevDnInv ElevUpHGLDnHGLUp(ft)(ac)(ac)(C)(min)(min)(in/hr)(cfs)(cfs)(cfs)(cfs)(ft/s)(in)(%)(ft)(ft)(ft)(ft)1Outfall5.6200.000.000.900.000.005.07.10.00.000.000.560.496.4246.5859.6560.0259.9860.45214.2700.000.000.000.000.000.07.10.00.000.000.520.495.9646.5660.0260.3060.5560.873221.6500.000.000.000.000.000.06.90.00.000.040.510.485.8446.4760.3061.7060.9562.514327.6200.000.000.510.000.005.06.80.00.000.150.350.274.0142.0361.7062.2662.9363.875473.2900.000.000.490.000.005.06.30.00.000.070.200.272.2941.9962.2663.7263.9764.786542.1600.000.000.000.000.000.05.80.00.000.000.130.271.4942.0263.7264.5764.8665.067617.3900.000.000.100.000.005.05.60.00.000.010.130.271.6942.0164.5664.9165.0865.158711.6400.000.000.100.000.005.05.50.00.000.010.120.271.8942.0664.9165.1565.2065.349814.4900.000.000.650.000.005.05.30.00.000.000.110.272.1542.0065.1565.4465.3465.6310912.2800.000.000.650.000.005.05.00.00.000.060.060.271.5142.0465.4465.6965.6365.831196.8300.000.000.670.000.005.05.00.00.000.050.050.271.3642.0565.4465.5865.6365.7012321.5000.000.000.900.000.005.05.30.00.000.060.120.271.3842.0061.7062.1362.9363.02131212.6200.000.000.900.000.005.05.00.00.000.060.060.270.6942.0662.1362.3963.0263.041415.9500.000.000.000.000.000.00.40.00.000.010.040.270.4642.0260.0260.1460.5560.5515148.2300.000.000.000.000.000.00.00.00.000.030.030.270.3942.0760.1460.3160.5560.551622.8600.000.000.000.000.000.00.00.00.000.010.010.280.1142.1060.3060.3660.9560.95 Hydraflow DOT Report2LineGrnd/RimDnGrnd/RimUpLine ID(ft)(ft)161.0061.93AREA G/O JUNCTION TO OUTFALL261.9362.24AREA G/P JUNC TO AREA G/O JUNC362.2467.02AREA G TO AREA G/P JUCTION467.0265.25AREA F TO AREA G565.2566.90AREA E TO AREA F666.9067.50ANGLE POINT TO AREA E767.5067.40AREA D TO ANGLE POINT867.4067.50AREA C TO AREA D967.5067.52AREA A/B JUNCTION TO AREA C1067.5267.35AREA A TO AREA A/B JUNCTION1167.5267.35AREA B TO AREA A/B JUNCTION1267.0267.23AREA H TO AREA G1367.2367.31AREA I TO AREA H1461.9362.00AREA O TO AREA G/O JUNCTION1562.0061.90AREA N TO AREA O1662.2462.02AREA P TO AREA G/P JUNCTION Hydraflow DOT Report1LineToLineLineLengthIncr.AreaTotalAreaRunoffCoeff.IncrC x ATotalC x AInletTimeTimeConcRnfalIntTotalRunoffAdnlFlowTotalFlowCapacFullVelocPipeSizePipeSlopeInv ElevDnInv ElevUpHGLDnHGLUp(ft)(ac)(ac)(C)(min)(min)(in/hr)(cfs)(cfs)(cfs)(cfs)(ft/s)(in)(%)(ft)(ft)(ft)(ft)1Outfall10.2400.000.000.900.000.005.05.50.00.000.010.140.272.0442.0562.3562.5662.6862.772113.4700.000.000.900.000.005.05.30.00.000.080.130.272.3142.0062.5662.8362.7763.033213.0100.000.000.900.000.005.05.00.00.000.060.060.271.4042.0062.8363.0963.0363.22 Hydraflow DOT Report2LineGrnd/RimDnGrnd/RimUpLine ID(ft)(ft)167.3367.20AREA L TO OUTFALL267.2067.31AREA K TO AREA L367.3167.31AREA J TO AREA K Hydraflow DOT Report1LineToLineLineLengthIncr.AreaTotalAreaRunoffCoeff.IncrC x ATotalC x AInletTimeTimeConcRnfalIntTotalRunoffAdnlFlowTotalFlowCapacFullVelocPipeSizePipeSlopeInv ElevDnInv ElevUpHGLDnHGLUp(ft)(ac)(ac)(C)(min)(min)(in/hr)(cfs)(cfs)(cfs)(cfs)(ft/s)(in)(%)(ft)(ft)(ft)(ft)1Outfall6.8800.000.000.670.000.005.05.00.00.000.060.060.281.2642.1863.3563.5063.6863.64 Hydraflow DOT Report2LineGrnd/RimDnGrnd/RimUpLine ID(ft)(ft)164.7664.75AREA M TO OUTFALL Residential Remodel and Associated Site Improvements – 2465 Jefferson Street 10 APPENDIX G DRAINAGE SWALE CALCULATIONS Channel Report Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Friday, Aug 27 2021 DRAINAGE SWALE TrapezoidalBottom Width (ft) = 0.25 Side Slopes (z:1) = 3.00, 3.00Total Depth (ft) = 0.25Invert Elev (ft) = 1.00Slope (%) = 2.00 N-Value = 0.035 CalculationsCompute by: Known Q Known Q (cfs) = 0.13 HighlightedDepth (ft)= 0.16 Q (cfs)= 0.130Area (sqft)= 0.12Velocity (ft/s)= 1.11Wetted Perim (ft) = 1.26 Crit Depth, Yc (ft) = 0.13Top Width (ft)= 1.21EGL (ft)= 0.18 0 .5 1 1.5 2 2.5 3 Elev (ft)Depth (ft)Section 0.75 -0.25 1.00 0.00 1.25 0.25 1.50 0.50 1.75 0.75 2.00 1.00 Reach (ft)