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HomeMy WebLinkAboutPD 16-10; 895 TAMARACK AVE; HYDROLOGY STUDY FOR TAMARACK STARBUCKS; 2016-08-20HYDROLOGY STUDY FOR Tamarack Starbucks 895 Tamarack Avenue CARLSBAD, CA. PD 16-10 Prepared For: Marrengo Morton Architects 7724 Girard Ave La Jolla, CA 92037 (858) 459-3769 Prepared By: Florez Engineering, Inc. 11440 West Bernardo Ct. San Diego, CA 92131 (858) 229-2493 Date: 4-20-2016 Revised: 8-20-2016 ENGINEER'S CERTIFICATION This Drainage Study has been prepared by Florez Engineering, and under the direction of Frank Florez, a Registered Civil Engineer in the State of California. The Registered Civil Engineer attests to the technical information contained herein and the engineering data upon which recommendations, conclusions, and decisions are based. ~~taaoqg ~~44z-? 8-23-2016 Frank Florez DATE REGISTERED CIVIL ENGINEER 9 TABLE OF CONTENTS PROJECTDISCRIBTION..............................................................................................................1 SCOPE AND PURPOSE 1 SITE DISCRIPTION .................................................. HYDROLOGIC METHODOLOGY ................................................................................................1 Pre and post development ..........................................................................................3 HYDRAULIC METhODOLOGY. 1 DetentionBasin ..................................................................................................... .4 OutletPipe .................................................................................................................4 HYDROLOGIC ANALYSIS RESULTS APPENDICES APPENDIX A APPENDIX B APPENDIX C APPENDIX D HYDROLOGIC REFERENCE MATERIAL DETENTION COMPUTER OUTPUT HYDRAULIC CALCULATOR HYDROLOGY MAPS PROJECT DISCRIPTION The project will construct a new 2,500 s.f. Starbucks building with a 500 s.f. patio deck and a parking lot on a 0.39 ac lot. SITE DISCRIPTION The entire was previously a gas station. The site topographic relieve ranges from 62 to 66 feet above mean sea level with the lower elevation at the south-east of the lot towards the Caltrans ditch. Most of the site (approx. 88%) drains to this area, while a small portion of the existing site (approx. 12%) drains toward Tamarack (north-west). The site is located at 895 Tamarack Ave in Carlsbad California and has direct access to Tamarack Avenue. - SCOPE AND PURPOSE The scope of this study is to determine the detention retardation necessary to comply with CEQA's requirement that the post developed storm water discharge from the site does not exceed the pre- developed discharge. The storm event used for this comparison is the 100 year design storm. HYDROLOGIC METHODOLOGY The small size and short drainage paths of the site makes the time of concentration calculation based on multi-sub-basin drainage paths ineffective. The calculation for the hydrologic runoff is therefore in accordance with the County of San Diego Hydrology Manual for a small single basin drainage shed utilizing the Rational Method equation. The time of concentration to determine the rainfall intensity index will be the initial area qualifying time of 5 minutes as required by the County Manual. The drainage shed area is the entire site at approximately 17,000 sf (0.39 ac) for the pre- developed condition and the post developed condition. See exhibit B, appendix A. The rainfall intensity (I) index was determined using the equation from the Intensity- Duration Design Chart, Figure 3-2, taken from the San Diego County Hydrology Manual: From: I = 7.44PD 645 Where: P6= 6-Hour Precipitation in inches = 2.5 inches as shown for the mainland costal area on the County 100 year isoprofio map. D = Duration in minutes = 5 minutes. 1=6.59 in/hr With the intensity the peak runoff can be calculated with the rational formula: Q=CIA For the pre-developed condition: C = 0.82 1= 6.59 in/hr Al =0.34ac A2=0.05ac Q2 = 2.10 cfs TO AREA 2 Qi = 0.30 cfs TO AREA] For the post-developed condition: With 13,278 s.f. of semi-impervious surface and 3,432 s.f. of landscaped surface. C = (0.79x 13,278 + 0.35 x 3,432) / 16,710 = 0.70 1= 6.59 in/hr A2=0.39ac Al =Oac Q2 = 1.79 cfs TO AREA 2 (SEE RETARDED/ADJ OUTFLOW TO ACCOUNT FOR BIO BASIN WHERE Q(ADJ)=0.487 CFS TO AREA 2 Q1=O..OcfsTO AREA 1 HYDRAULIC METHODOLOGY The peak 100 year post development discharge of 1.8 cfs is less than the pre-development discharge of 1.84 cfs. The reduction if flow is due to the permeable payers in the parking area, and the addition of a bio-retention basin, as well as landscaped areas. When the retardation of the bio basin is accounted for, the total q 10 outflow is reduced to 0.487 cfs). The project incorporates LID Bio-Retention basins that are sized in the SWMP under separate cove, to provide a surface area that can pass and treat the 85 percentile storm event through an amended soil medium at a filtration rate of 5 inches per hour per square foot. Therefore, the minimum square foot area of the basin is set by LID policy including a minimum depth of filtration medium of 1.5 feet plus a 1 foot layer of crushed rock. This 2.5 feet of material has a porosity of 40 percent. This void ratio may provide the storage volume necessary to attenuate the developed flows. Analyzing the Bio-Retention Basins as retardation detention basins is done using a computer application of the County of San Diego Flood Control District's Hydrology Manual. The application includes a routine that uses the modified plus routing method to analyze the detention basin. It is offered by CivilDesign ®Corporation and a complete program description is available upon request. TABULATED HYDROLOGIC I HYDRAULIC COMPUTATIONAL RESULTS Developed 100 year For Area 1 (to Tamarack street gutter) Condition Effective C Tc (mm.) I in/hr Area (ac) Total Qak (cfs) Total Pre-Development 0.82 5.0 6.59 0.05 0.27 Post Development 0.70 5.0 6.59 0 0 Permeable Payers Water Depth (ft) Qpeak (cfs) Discharge CEQA Compliance 0 CFS 0 For Area 2 (to Caltrans Brow Ditch) Condition Effective C Tc (mm.) I in/hr Area (ac) Total Qpeak (cfs) Total Pre-Development 0.82 5.0 6.59 0.34 1.84 Post Development 0.70 5.0 6.59 0.39 1.80* Detention Basin Water Depth (ft) Qpeak (cfs) Discharge CEQA Compliance 1.80* = See below calculation for attenuated flowrate that includes ponding affect and storage volume of Bio Basin on site. Also please see Condition Effective C Tc (mm.) I in/hr Area (ac) Total Qpeak (cfs) Total Post development 0.487 CFS including attenuation from Bio_Basin CEQA Compliance 0.487 CFS HYDROLOGIC ANALYSIS RESULTS Analyzing the LID Bio-Retention basin as a detention retardation basin shows that the basin discharge can be attenuate well below the pre-development 100 year storm discharge and achieve compliance with CEQA. See computer printout in appendix B. The basins outlet is a 6 inch pipe. Two overflow risers are incorporated within the bio basin, These risers will be used when ponding depth in the basin exceeds capacity. All water above ponding design depth will bypass the bio basin and flow directly to the outlet pipe. In the event that these inlets get clogged, all runoff will flow over the edge of the basin and toward the intended drainage ditch. Outlet pipe Capacity: The calculated flow capacity of the outlet pipe is based on the critical depth of the flow through the entrance. Considering a 6 inch (0.50 feet) diameter pipe with an entrance flow of 0.589 cfs the critical depth is 0.39 feet and the critical velocity is 3.58 f/s. See critical depth calculator in appendix C. The head water build up in the overflow riser to push the required flow into the pipe is: From the velocity head equation; Assuming an entrance loss k = 0.2: Headwater buildup in riser: Vh = kV2 / 2g Vh =1.2 (3.58)2 / 64.4 = 0.24 feet. HW = Vh + Dc = 0.63 feet Therefore for this flow, as long as the 6 inch outlet pipe has a slope that is steeper than the critical slope of 1.20 percent the pipe will exhibit entrance control and the headwater will not exceed 0.63 feet. See critical slope calculator in exhibit C. APPENDIX A HYDROLOGY REFERENCE MATERIAL J - \\' OCEANS%0OLfVEAV '1LE \ / L 7 kA / P0 ,1P.WY , MO4(ISTA0 B, LU - SPRGS cv \\\ '\ 8' - <- / } . 0 -41S - CREEK SU /° R /') of VIL Lt\l ME - --- 111 I. \ IS! I / I(Oø\ \\G $O -I / - CIO < I \ - I ----- I - - 4 0 > R11 I .4 I I L - 4C0 --- --- Coo-cøcLu C I ,' EL c q4f t. fISSIo BOR IO( I/Il /)/() \/) I I 1V (,()() Ro -. / -V 04Y tA C tA RD ws -< o ' fOi' I 04( I 71 ' - w02 SVO 8 WQ( I/OS / I( ()O\ co 4 GO1 ve- co I''o Ink Lu py it. UCADIA " MTN'JR [ti --- ENCIN,t / - APPENDIX B DETENTION COMPUTER OUTPUT This printour shows the retarded basin routing outflow that will flow into the Caltrans brow ditch. FLOOD HYDROGRAPH ROUTING PROGRAM Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2005 Study date: 08/17/16 TAMARACK STARBUCKS - CARLSBAD 100 YEAR BIO-BASIN RETENTION/RETARDATION FLOW TO CALTRANS DITCH FILE: TAMARACK100DET Program License Serial Number 6148 -------------------------------------------------------------------- HYDROGRAPH INFORMATION From study/file name: TAMARACK100DEV.rte ****************************HYDROGPJPH DATA**************************** Number of intervals = 365 Time interval = 1.0 (Mm.) Maximum/Peak flow rate = 1.770 (CFS) Total volume = 0.056 (Ac.Ft) Status of hydrographs being held in storage Stream 1 Stream 2 Stream 3 Stream 4 Stream 5 Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 **** RETARDING BASIN ROUTING **** Program computation of outflow v. depth CALCULATED OUTFLOW DATA AT DEPTH = 2.00 (Ft.)) Pipe length = 10.00 (Ft.) Elevation difference = 0.10(Ft.) Manning's N = 0.013 No. of pipes = 1 Given pipe size = 4.00(In.) NOTE: Assuming free outlet flow. NOTE: Normal flow is pressure flow. The total friction loss through the pipe is 2.100 (Ft.) Pipe friction loss = 0.997(Ft.) Minor friction loss = 1.104(Ft.) K-factor = 1.50 Calculated flow rate through pipe(s) = 0.601(CFS) Total outflow at this depth = 0.60 (CFS) CALCULATED OUTFLOW DATA AT DEPTH = 2.83 (Ft.)) Pipe length = 10.00 (Ft.) Elevation difference = 0.10 (Ft.) Manning's N = 0.013 No. of pipes = 1 Given pipe size = 4.00(In.) NOTE: Assuming free outlet flow. NOTE: Normal flow is pressure flow. The total friction loss through the pipe is 2.930 (Ft.) Pipe friction loss = 1.391(Ft.) Minor friction loss = 1.540(Ft.) K-factor = 1.50 Calculated flow rate through pipe(s) = 0.710(CFS) Total outflow at this depth = 0.71(CFS) CALCULATED OUTFLOW DATA AT DEPTH = 3.33 (Ft.)) Pipe length = 10.00 (Ft.) Elevation difference = 0.10(Ft.) Manning's N = 0.013 No. of pipes = 1 Given pipe size = 4.00(In.) NOTE: Assuming free outlet flow. NOTE: Normal flow is pressure flow. The total friction loss through the pipe is 3. 430(Ft.) Pipe friction loss = 1.628 (Ft.) Minor friction loss = 1.803(Ft.) K-factor = 1.50 Calculated flow rate through pipe(s) = 0.768(CFS) Total outflow at this depth = 0.77(CFS) -------------------------------------------------------------------- Total number of inflow hydrograph intervals = 365 Hydrograph time unit = 1.000 (Mm.) Initial depth in storage basin = 0.00(Ft.) -------------------------------------------------------------------- Initial basin depth = 0.00 (Ft.) Initial basin storage = 0.00 (Ac.Ft) Initial basin outflow --------------------------------------------------------------------- = 0.00 (CFS) Depth vs. Storage and Depth vs. Discharge data: Basin Depth Storage Outflow (S_O*dt/2) (S+O*dt/2) (Ft.) (Ac.Ft) (CFS) (Ac.Ft) --------------------------------------------------------------------- (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 2.000 0.022 0.601 0.022 0.022 2.830 0.044 0.710 0.044 0.044 3.330 0.057 0.768 0.056 0.058 Hydrograph -------------------------------------------------------------------- --------------------------------------------------------------------- Detention Basin Routing Graph values: '1= unit inflow; 'O'=outf low at time shown Time Inflow Outflow Storage Depth (Hours) (CFS) (CFS) (Ac.Ft) .0 0.4 0.89 1.33 1.77 (Ft.) 0.017 0.01 0.00 0.000 0 I I I 0.00 0.033 0.02 0.00 0.000 0 I I I 0.00 0.050 0.02 0.00 0.000 0 I I I I 0.00 0.067 0.03 0.00 0.000 0 I I I I 0.01 0.083 0.04 0.00 0.000 0 I I I I 0.01 0.100 0.04 0.00 0.000 0 I I I I 0.02 0.117 0.04 0.01 0.000 0 I I I 0.02 0.133 0.04 0.01 0.000 0 I I I I 0.02 0.150 0.04 0.01 0.000 0 I I I I 0.03 0.167 0.04 0.01 0.000 0 I I I 0.03 0.183 0.04 0.01 0.000 0 I I I 0.04 0.200 0.04 0.01 0.000 0 I I I 0.04 0.217 0.04 0.01 0.000 0 I 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I I I 1.26 4.100 1.47 0.42 0.015 I 01 I I 1 1 1.41 4.117 1.17 0.46 0.017 I 0 I I 1 1 1.52 4.133 0.88 0.48 0.017 I 0 II I I 1.59 4.150 0.58 0.49 0.018 I 0 I I I 1.62 4.167 0.28 0.48 0.018 I I 0 I I I 1.61 4.183 0.26 0.48 0.017 I I 0 I I 1.59 4.200 0.24 0.47 0.017 I I 0 I I I 1.56 4.217 0.23 0.46 0.017 I I 0 I I 1.53 4.233 0.21 0.45 0.017 I 0 I I I 1.50 4.250 0.19 0.44 0.016 1 I 01 I I I 1.47 4.267 0.18 0.43 0.016 1 I 01 I I I 1.44 4.283 0.17 0.42 0.015 I I 01 I I I 1.41 4.300 0.16 0.41 0.015 1 I CI I I I 1.37 4.317 0.16 0.40 0.015 1 I 01 1 I I 1.34 4.333 0.15 0.39 0.014 I I 01 I I I 1.31 4.350 0.14 0.39 0.014 I I 0 I I I I 1.28 4.367 0.14 0.38 0.014 I I 0 I I I I 1.25 4.383 0.13 0.37 0.013 I I 0 I I I I 1.22 4.400 0.13 0:36 0.013 I I 0 I I I I 1.19 4.417 0.12 0.35 0.013 I I 0 I I I I 1.16 4.433 0.12 0.34 0.013 I I 0 I I I 1.14 4.450 0.12 0.33 0.012 I I 0 I I I I 1.11 4.467 0.11 0.33 0.012 I I 0 I I I I 1.08 4.483 0.11 0.32 0.012 II 0 I I I 1 1.06 4.500 0.11 0.31 0.011 II 0 I I I I 1.03 4.517 0.10 0.30 0.011 II 0 I I I I 1.01 4.533 0.10 0.29 0.011 II 0 I I I I 0.98 4.550 0.10 0.29 0.011 II 0 I I I I 0.96 4.567 0.10 0.28 0.010 II 0 I I I 1 0.93 4.583 0.10 0.27 0.010 II 0 I I I I 0.91 4.600 0.09 0.27 0.010 II 0 I I I I 0.89 4.617 0.09 0.26 0.010 II 0 I I I I 0.87 4.633 0.09 0.25 0.009 II 0 I I I I 0.85 4.650 0.09 0.25 0.009 II 0 I I 1 I 0.83 4.667 0.09 0.24 0.009 II 0 I I I I 0.81 4.683 0.09 0.24 0.009 li 0 I 1 I I 0.79 4.700 0.08 0.23 0.008 11 0 I I I I 0.77 4.717 0.08 0.23 0.008 II 0 I I I I 0.75 4.733 0.08 0.22 0.008 11 0 I I I I 0.73 4.750 0.08 0.22 0.008 11 C I I I I 0.72 4.767 0.08 0.21 0.008 II 0 I I I I 0.70 4.783 0.08 0.21 0.008 II 0 1 I I I 0.68 4.800 0.08 0.20 0.007 II 0 1 I I I 0.67 4.817 0.08 0.20 0.007 II 0 1 I I I 0.65 4.833 0.07 0.19 0.007 II 0 1 I I I 0.64 4.850 0.07 0.19 0.007 II 0 1 1 I I 0.62 4.867 0.07 0.18 0.007 II 0 I I I I 0.61 4.883 0.07 0.18 0.007 II 0 I I I I 0.60 4.900 0.07 0.17 0.006 II 0 I I I I 0.58 4.917 0.07 0.17 0.006 II 0 I I I I 0.57 4.933 0.07 0.17 0.006 II 0 I I I I 0.56 4.950 0.07 0.16 0.006 110 I I I I 0.54 4.967 0.07 0.16 0.006 110 I I I I 0.53 4.983 0.07 0.16 0.006 110 I I I I 0.52 5.000 0.07 0.15 0.006 110 I I I I 0.51 5.017 0.06 0.15 0.005 110 I I I I 0.50 5.033 0.06 0.15 0.005 110 I I I I 0.49 5.050 0.06 0.14 0.005 110 I I I I 0.48 5.067 0.06 0.14 0.005 110 I I I I 0.47 5.083 0.06 0.14 0.005 110 I I I I 0.46 5.100 0.06 0.13 0.005 110 1 1 1 1 0.45 5.117 0.06 0.13 0.005 110 I I I I 0.44 5.133 0.06 0.13 0.005 110 I I I I 0.43 5.150 0.06 0.13 0.005 110 I I I I 0.42 5.167 0.06 0.12 0.005 110 I I I I 0.41 5.183 0.06 0.12 0.004 110 I I I I 0.41 5.200 0.06 0.12 0.004 110 I I I 0.40 5.217 0.06 0.12 0.004 JIO I I I 0.39 5.233 0.06 0.12 0.004 110 I I I I 0.38 5.250 0.06 0.11 0.004 JIO I I I I 0.38 5.267 0.06 0.11 0.004 110 I I I I 0.37 5.283 0.06 0.11 0.004 10 J I I 0.36 5.300 0.05 0.11 0.004 10 I I I I .0.36 5.317 0.05 0.10 0.004 10 I I I I 0.35 5.333 0.05 0.10 0.004 10 I I I 0.34 5.350 0.05 0.10 0.004 10 I I I 0.34 5.367 0.05 0.10 0.004 10 I I I 0.33 5.383 0.05 0.10 0.004 10 I I I 0.33 5.400 0.05 0.10 0.004 10 I I I 0.32 5.417 0.05 0.09 0.003 10 I I I 0.31 5.433 0.05 0.09 0.003 10 I I I I 0.31 5.450 0.05 0.09 0.003 10 I I I I 0.30 5.467 0.05 0.09 0.003 10 I I I 0.30 5.483 0.05 0.09 0.003 10 I I I I 0.29 5.500 0.05 0.09 0.003 10 I I I 0.29 5.517 0.05 0.09 0.003 10 I I I 0.28 5.533 0.05 0.08 0.003 10 I I I 0.28 5.550 0.05 0.08 0.003 10 I I I 0.28 5.567 0.05 0.08 0.003 10 I I I 0.27 5.583 0.05 0.08 0.003 10 I I I 0.27 5.600 0.05 0.08 0.003 10 I I I 0.26 5.617 0.05 0.08 0.003 10 I I I I 0.26 5.633 0.05 0.08 0.003 10 I I I I 0.26 5.650 0.05 0.08 0.003 10 I I I 0.25 5.667 0.05 0.07 0.003 10 I I I 0.25 5.683 0.05 0.07 0.003 10 I I I 0.24 5.700 0.05 0.07 0.003 10 I 0.24 5.717 0.05 0.07 0.003 10 I I I I 0.24 5.733 0.04 0.07 0.003 10 I 0.23 5.750 0.04 0.07 0.003 10 I I 0.23 5.767 0.04 0.07 0.003 10 I I I 0.23 5.783 0.04 0.07 0.002 10 I I 0.23 5.800 0.04 0.07 0.002 10 I I I 0.22 5.817 0.04 0.07 0.002 10 I I I I 0.22 5.833 0.04 0.07 0.002 10 I I I 0.22 5.850 0.04 0.06 0.002 10 I I I I 0.21 5.867 0.04 0.06 0.002 10 I I I 0.21 5.883 0.04 0.06 0.002 10 I I I 0.21 5.900 0.04 0.06 0.002 10 I I I I 0.21 5.917 0.04 0.06 0.002 10 I I I 0.20 5.933 0.04 0.06 0.002 10 I I I 0.20 5.950 0.04 0.06 0.002 10 I I I 0.20 P5.967 0.04 0.06 0.002 10 I I I 0.20 5.983 0.04 0.06 0.002 10 I I I I 0.19 6.000 0.04 0.06 0.002 10 I I I 0.19 6.017 0.04 0.06 0.002 10 I I I I 0.19 6.033 0.04 0.06 0.002 10 I I I 0.19 6.050 0.04 0.06 0.002 10 I I I 0.19 6.067 0.04 0.06 0.002 10 I I I I 0.18 6.083 0.04 0.05 0.002 0 I I . I 0.18 6.100 0.00 0.05 0.002 0 I I I I 0.18 O .O I I I I 0 0000 100 000 001L. O .O I I I I 0 0000 100 000 £80L O.O I I I I 0 0000 100 000 L90L O.O I I I I 0 0000 100 000 OSOL O.O I I I I 0 0000 100 000 EEOL O.O I I I I 0 0000 100 000 L101. O.O I I I I 0 0000 100 000 000L O.O I I I I 0 0000 100 000 £869 E00 I I I I 0 0000 100 000 L969 EOO I I I I 0 0000 100 000 OS69 E00 I I I I 0 0000 I00 000 £E69 £00 I I I I 0 0000 t00 000 L169 EOO I I I I 0 0000 I00 000 0069 E00 I I I I 0 0000 100 000 E889 E00 I I I I 0 0000 100 000 L.989 £00 I I I I 0 0000 100 000 0S89 EOO I I I I 0 0000 100 000 EE89 V0 ,0 I I I I 0 0000 100 000 LT89 O.O I I I I 0 0000 100 000 0089 O.O I I I 0 0000 100 000 E8L9 I I I I 0 0000 100 000 L9L9 I I I I 0 0000 100 000 OSL.9 I I I I 0 0000 100 000 EEL.9 O.O. I I I 0 0000 100 000 L1L9 900 I I I I 0 t000 100 000 00L9 S00 I I I 0 I000 100 000 E899 SO.O I I I 0 1000 100 000 L.999 SO.O I I I I 0 1000 OO 000 0999 S00 I I I 0 1000 OO 000 EE99 900 I I I 0 1000 OO 000 L199 900 I I I I 0 I000 ZOO 000 0099 900 I I I 0 1000 OO 000 E8S9 900 I I I 0 1000 OO 000 L9S9 900 I I I I 0 1000 OO 000 OSS9 L00 I I I I 0 1000 OO 000 L00 I I I I 0 I000 OO 000 LT9 L00 I I I I 0 t000 OO 000 00S9 L00 I I I I 0 1000 ZOO 000 E89 800 I I I I 0 1000 OO 000 L97 9 800 I I I I 0 I000 ZOO 000 OS9 800 I I I I 0 1000 EOO 000 . EE9 600 I I I I 0 1000 EOO 000 LI9 600 I I I I 0 1000 EOO 000 OO9 600 I I I I 0 1000 EOO 000 E8E9 010 I I I I 0 1000 EOO 000 L9E9 010 I I I I 0 1000 EOO 000 0SE9 110 I I I 0 tOOo E00 000 EEE9 110 I I I• I 0 1000 E00 000 L1E9 T.t .O I I I I 0 1000 E00 000 00E9 t .O I I I I .0 1000 OO 000 E89 I .O I I I I 0 1000 OO 000 L9Z.9 E10 I I I I 0 1000 OO 000 OS9 E10 I I I I 0 IOOO OO 000 EE9 FtO I' I I 0 OOO 'OO 000 Lt9 t7t0 I I I .1 0 OOO 'OO 000 OO9 ST .O I I I I 0 OOO OO 000 E8t9 ST.O I I 0 000 soo 000 L919 910 I I I I 0 OOO SOO 000 0S19 L10 I I I I 0 OOO S00 000 £E19 L10 I I I I 0 OOO S00 000 Ltt9 7.117 0.00 0.01 0.000 0 I I I I 0.02 7.133 0.00 0.01 0.000 0 I I I 0.02 7.150 0.00 0.01 0.000 0 I I 0.02 7.167 0.00 0.00 0.000 0 I I I I 0.02 7.183 0.00 0.00 0.000 0 I I I I 0.02 7.200 0.00 0.00 0.000 0 I I I 0.01 7.217 0.00 0.00 0.000 0 I I I 0.01 7.233 0.00 0.00 0.000 0 I I I 0.01 7.250 0.00 0.00 0.000 0 I I I I 0.01 7.267 0.00 0.00 0.000 0 I I I I 0.01 7.283 0.00 0.00 0.000 0 I I I 0.01 7.300 0.00 0.00 0.000 0 I I I 0.01 7.317 0.00 0.00 0.000 0 I I I 0.01 7.333 0.00 0.00 0.000 0 I I I 0.01 7.350 0.00 0.00 0.000 0 I I I 0.01 7.367 0.00 0.00 0.000 0 I I 0.01 7.383 0.00 0.00 0.000 0 I I I I 0.01 7.400 0.00 0.00 0.000 0 I I I 0.01 7.417 0.00 0.00 0.000 0 I I I I 0.01 7.433 0.00 0.00 0.000 0 I I I 0.01 7.450 0.00 0.00 0.000 0 I 0.01 7.467 0.00 0.00 0.000 0 .1 I 0.01 7.483 0.00 0.00 0.000 0 I I I 0.01 7.500 0.00 0.00 0.000 0 I I I 0.01 7.517 0.00 0.00 0.000 0 I I I 0.01 7.533 0.00 0.00 0.000 0 I I I 0.01 7.550 0.00 0.00 0.000 0 I I I 0.01 7.567 0.00 0.00 0.000 0 I I I 0.01 7.583 0.00 0.00 0.000 0 I I I 0.01 7.600 0.00 0.00 0.000 0 I 0.01 7.617 0.00 0.00 0.000 0 I I 0.01 7.633 0.00 0.00 0.000 0 I 0.01 7.650 0.00 0.00 0.000 0 I I I 0.01 7.667 0.00 0.00 0.000 0 I I I 0.01 7.683 0.00 0.00 0.000 0 I I I 0.00 7.700 0.00 0.00 0.000 0 I I I 0.00 7.717 0.00 0.00 0.000 0 I I I 0.00 7.733 0.00 0.00 0.000 0 I I I 0.00 7.750 0.00 0.00 0.000 0 I I I 0.00 7.767 0.00 0.00 0.000 0 I I I 0.00 7.783 0.00 0.00 0.000 0 I I I I 0.00 7.800 0.00 0.00 0.000 0 I I I 0.00 7.817 0.00 0.00 0.000 0 I I I I 0.00 7.833 0.00 0.00 0.000 0 I I I 0.00 7.850 0.00 0.00 0.000 0 I l I I 0.00 7.867 0.00 0.00 0.000 0 I I I I 0.00 * * * * * * * * * * * * * * * * * * * * * * * * * * * *HYDRQGPPH DATA* * * * * * * * * * * * * * * * * * * * * * * * * * * * Number of intervals = 472 Time interval = 1.0 (Mm.) Maximum/Peak flow rate = 0.487 (CFS) Total volume = 0.056 (Ac.Ft) Status of hydrographs being held in storage Stream 1 Stream .2 Stream 3 Stream 4 Stream 5 Peak (CFS) 0.000 0.000 0.000 0.000 0.000 Vol (Ac.Ft) 0.000 0.000 0.000 0.000 0.000 *********************************************************************** For comparison, the pre-project flowrate to the Caltrans ditch was 1.84 cfs The proposed Starbucks improvements will have a peak outflow of 0.487 cfs APPENDIX C HYDRAULIC REFERENCE MATERIAL San Diego County Rational Hydrology Program CIVILCADD/CIVILDESIGN Engineering Software, (c) 1991-2006 Version 7.7 Rational method hydrology program based on San Diego County Flood Control Division 2003 hydrology manual Rational Hydrology Study Date: 08/17/16 ------------------------------------------------------------------------ TAMARACK STARBUCKS - CARLSBAD 100 YEAR STORM HYDROGRAPH TO DRIVE DETENTION FLOW INTO THE BIO-RETENTION BASIN FILE: TAMARACK100DEV ********* Hydrology Study Control Information ********** Program License Serial Number 6148 ------------------------------------------------------------------------ Rational hydrology study storm event year is 100.0 English (in-lb) input data Units used Map data precipitation entered: 6 hour, precipitation(inches) = 2.500 24 hour precipitation(inches) = 4.000 P6/P24 = 62.5% San Diego hydrology manual 'C' values used Process from Point/Station 0.000 to Point/Station 0.000 USER DEFINED FLOW INFORMATION AT A POINT **** User specified 'C' value of 0.700 given for subarea Rainfall intensity (I) = 6.587(In/Hr) for a . 100.0 year storm User specified values are as follows: TC = 5.00 mm. Rain intensity = 6.59(In/Hr) Total area = 0.390(Ac.) Total runoff = 1.770(CFS) ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station 0.000 to Point/Station 0.000 6 HOUR HYDROGRAPH ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Hydrograph Data - Section 6, San Diego County Hydrology manual, June 2003 Time of Concentration = 5.00 Basin Area = 0.39 Acres 6 Hour Rainfall = 2.500 Inches Runoff Coefficient = 0.700 Peak Discharge = 1.77 CFS Time (Mm) Discharge (CFS) 0 0.000 5 0.040 10 0.040 15 0.041 20 0.042 25 0.042 30 0.043 35 0.044 40 0.044 45 0.045 50 0.046 55 0.047 60 0.047 65 0.048 70 0.049 75 0.050 80 0.051 85 0.052 90 0.053 95 0.054 100 0.055 105 0.057 110 0.058 115 0.060 120 0.061 125 0.063 130 0.064 135. 0.067 140 0.068 145 0.071 150 0.072 155 0.076 160 0.078 165 0.082 170 0.084 175 0.090 180 0.093 185 0.099 190 0.103 195 0.112 200 0.117 205 0.130 210 0.138 215 0.158 220 0.171 225 0.210 230 0.239 235 0.351 240 0.494 245 1.770 250 0.281 255 0.188 260 0.147 265 0.123 270 0.107 275 0.096 280 0.087 285 0.080 290 0.074 295 0.069 300 0.065 305 0.062 310 0.059 315 0.056 320 0.054 325 0.051 330 0.049 335 0.048 340 0.046 345 0.045 350 0.043 355 0.042 360 0.041 365 0.040 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 6-HOUR STORM Runoff H y d r o g r a p h -------------------------------------------------------------------- Hydrograph in 1 Minute intervals ((CFS)) Time(h+m) Volume Ac.Ft -------------------------------------------------------------------- Q(CFS) 0 0.4 0.9 1 1.3 1.8 0+ 0 0.0000 0.00 Q I I I 0+ 1 0.0000 0.01 Q I I I I 0+ 2 0.0000 0.02 Q I I I I 0+ 3 0.0001 0.02 Q I I I I 0+ 4 0.0001 0.03 Q I I I I 0+ 5 0.0002 0.04 Q I I I I 0+ 6 0.0002 0.04 Q I I I I 0+ 7 0.0003 0.04 Q I I I I 0+ 8 0.0003 0.04 Q I I I I 0+ 9 0.0004 0.04 Q I I I I 0+10 0.0004 0.04 0 I I I I 0+11 0.0005 0.04 Q I I I I 0+12 0.0006 0.04 Q I I I I 0+13 0.0006 0.04 Q I I I 0+14 0.0007 0.04 Q I I I I 0+15 0.0007 0.04 Q I I I I 0+16 0.0008 0.04 Q I I I I 0+17 0.0008 0.04 Q I I I I 0+18 0.0009 0.04 Q I I I I 0+19 0.0010 0.04 Q I I I I 0+20 0.0010 0.04 Q I I I I 0+21 0.0011 0.04 0 I I I I 0+22 0.0011 0.04 Q I I I I 0+23 0.0012 0.04 Q I I I I 0+24 0.0012 0.04 Q I I I I 0+25 0.0013 0.04 Q I I I I 0+26 0.0014 0.04 Q I I I I 0+27 0.0014 0.04 QV I I I I 0+28 0.0015 0.04 QV I I I I 0+29 0.0015 0.04 QV I I 0+30 0.0016 0.04 QV I I I 0+31 0.0017 0.04 QV I I I 0+32 0.0017 0.04 QV I I I 0+33 0.0018 0.04 QV I I I I 0+34 0.0018 0.04 QV I I I I 0+35 0.0019 0.04 QV I I I I 0+36 0.0020 0.04 QV I I I I 0+37 0.0020 0.04 QV I I I 0+38 0.0021 0.04 QV I I I I 0+39 0.0021 0.04 QV I I I I 0+40 0.0022 0.04 QV 0+41 0.0023 0.04 I Q 0+42 0.0023 0.04 I Q 0+43 0.0024 0.04 I Q 0+44 0.0024 0.04 I Q 0+45 0.0025 0.05 10 0+46 0.0026 0.05 I Q 0+47 0.0026 0.05 IQ 0+48 0.0027 0.05 10 0+49 0.0027 0.05 10 0+50 0.0028 0.05 by 0+51 0.0029 0.05 by 0+52 0.0029 0.05 IQV 0+53 0.0030 0.05 IQV 0+54 0.0031 0.05 IQV 0+55 0.0031 0.05 IQV 0+56 0.0032 0.05 by 0+57 0.0033 0.05 IQV 0+58 0.0033 0.05 IQV 0+59 0.0034 0.05 IQV 1+ 0 0.0035 0.05 IQV 1+ 1 0.0035 0.05 bo 1+ 2 0.0036 0.05 IQV 1+ 3 0.0037 0.05 bo 1+ 4 0.0037 0.05 IQV 1+ 5 0.0038 0.05 IQV 1+ 6 0.0038 0.05 IQV 1+ 7 0.0039 0.05 IQV 1+ 8 0.0040 0.05 IQV 1+ 9 0.0041 0.05 IQV 1+10 0.0041 0.05 bo 1+11 0.0042 0.05 IQV 1+12 0.0043 0.05 10 V 1+13 0.0043 0.05 10 V 1+14 0.0044 0.05 10 V 1+15 0.0045 0.05 10 V 1+16 0.0045 0.05 10 V 1+17 0.0046 0.05 10 V 1+18 0.0047 0.05 10 V 1+19 0.0047 0.05 IQ v 1+20 0.0048 0.05 10 V 1+21 0.0049 0.05 10 V 1+22 0.0049 0.05 10 V 1+23 0.0050 0.05 10 V 1+24 0.0051 0.05 I Q V 1+25 0.0052 0.05 10 V 1+26 0.0052 0.05 10 V 1+27 0.0053 0.05 I Q V 1+28 0.0054 0.05 10 V 1+29 0.0055. 0.05 10 V 1+30 0.0055 0.05 10 V 1+31 0.0056 0.05 10 V 1+32 0.0057 0.05 10 V 1+33 0.0057 0.05 10 V 1+34 0.0058 0.05 10 V 1+35 0.0059 0.05 10 V 1+36 0.0060 0.05 bo V 1+37 0.0060 0.05 IQ V 1+38 0.0061 0.05 IQ V 1+39 0.0062 0.05 10 V 1+40 0.0063 0.06 IQ V 1+41 0.0063 0.06 10 V 1+42 0.0064 0.06 I Q V 1+43 0.0065 0.06 10 V 1+44 0.0066 0.06 IQ V 1+45 0.0067 0.06 I Q V 1+46 0.0067 0.06 IQ V 1+47 0.0068 0.06 10 V 1+48 0.0069 0.06 1 9 V 1+49 0.0070 0.06 IQ V 1+50 0.0071 0.06 IQ V 1+51 0.0071 0.06 IQ V 1+52 0.0072 0.06 IQ V 1+53 0.0073 0.06 10 V 1+54 0.0074 0.06 IQ V 1+55 0.0075 0.06 IQ V 1+56 0.0075 0.06 10 V 1+57 0.0076 0.06 10 V 1+58 0.0077 0.06 10 V 1+59 0.0078 0.06 IQ V 2+ 0 0.0079 0.06 IQ V 2+ 1 0.0080 0.06 10 V 2+ 2 0.0080 0.06 10 V 2+ 3 0.0081 0.06 IQ V 2+ 4 0.0082 0.06 IQ V 2+ 5 0.0083 0.06 IQ V 2+ 6 0.0084 0.06 10 V 2+ 7 0.0085 0.06 IQ V 2+ 8 0.0086 0.06 10 V 2+ 9 0.0087 0.06 10 V 2+10 0.0087 0.06 I Q V 2+11 0.0088 0.06 10 V 2+12 0.0089 0.07 IQ V 2+13 0.0090 0.07 10 V 2+14 0.0091 0.07 IQ V 2+15 0.0092 0.07 Q V 2+16 0.0093 0.07 I Q V 2+17 0.0094 0.07 10 V 2+18 0.0095 0.07 IQ V 2+19 0.0096 0.07 IQ V 2+20 0.0097 0.07 IQ V 2+21 0.0097 0.07 IQ V 2+22 0.0098 0.07 IQ 2+23 0.0099 0.07 IQ 2+24 0.0100 0.07 10 2+25 0.0101 0.07 10 2+26 0.0102 0.07 IQ 2+27 0.0103 0.07 10 2+28 0.0104 0.07 IQ 2+29 0.0105 0.07 IQ 2+30 0.0106 0.07 IQ 2+31 0.0107 0.07 10 2+32 0.0108 0.07 10 2+33 0.0109 0.07 10 2+34 0.0110 0.08 I Q 2+35 0.0111 0.08 10 2+36 0.0112 0.08 IQ 2+37 0.0114 0.08 IQ 2+38 0.0115 0.08 10 2+39 0.0116 0.08 10 IQ IQ IQ IQ IQ IQ IQ IQ IQ IQ IQ IQ IQ IQ Q Q Q Q Q Q Q Q Q Q Q Q Q 2+40 0.0117 0.08 2+41 0.0118 0.08 2+42 0.0119 0.08 2+43 0.0120 0.08 2+44 0.0121 0.08 2+45 0.0122 0.08 2+46 0.0123 0.08 2+47 0.0125 0.08 2+48 0.0126 0.08 2+49 0.0127 0.08 2+50 0.0128 0.08 2+51 0.0129 0.09 2+52 0.0130 0.09 2+53 0.0132 0.09 2+54 0.0133 0.09 2+55 0.0134 0.09 2+56 0.0135 0.09 2+57 0.0137 0.09 2+58 0.0138 0:09 2+59 0.0139 0.09 3+ 0 0.0140 0.09 3+ 1 0.0142 0.09 3+ 2 0.0143 0.10 3+ 3 0.0144 0.10 3+ 4 0.0146 0.10 3+ 5 0.0147 0.10 3+ 6 0.0148 0.10 3+ 7 0.0150 0.10 3+ 8 0.0151 0.10 3+ 9 0.0153 0.10 3+10 0.0154 0.10 3+11 0.0155 0.10 3+12 0.0157 0.11 3+13 0.0158 0.11 3+14 0.0160 0.11 3+15 0.0161 0.11 3+16 0.0163 0.11 3+17 0.0165 0.11 3+18 0.0166 0.12 3+19 0.0168 0.12 3+20 0.0169 0.12 3+21 0.0171 0.12 3+22 0.0173 0.12 3+23 0.0174 0.12 3+24 0.0176 0.13 3+25 0.0178 0.13 3+26 0.0180 0.13 3+27 0.0182 0.13 3+28 0.0183 0.13 3+29 0.0185 0.14 3+30 0.0187 0.14 3+31 0.0189 0.14 3+32 0.0191 0.15 3+33 0.0193 0.15 3+34 0.0195 0.15 3+35 0.0198 0.16 3+36 0.0200 0.16 3+37 0.0202 0.16 3+38 0.0204 0.17 3+39 0.0207 0.17 VI Vj Vp VI VI VI VI VI VI VI VI VI* VI VI VI VI VI VI VI VI V V V V V V V V V V IV IV IV IV IV IV IV IV IV IV IV IV IV Iv IV V IV IV IV IV IV IV Iv Iv Iv Iv Iv 3+40 0.0209 0.17 I 0 I V 3+41 0.0212 0.18 I Q V 3+42 0.0214 0.19 I 0 I V 3+43 0.0217 0.19 I 0 I V I 3+44 0.0220 0.20 I I V 3+45 0.0222 0.21 Q I V 3+46 0.0225 0.22 I Q I V 3+47 0.0228 0.22 I Q I V 3+48 0.0232 0.23 I .• Q I V 3+49 0.0235 0.23 I Q I V I 3+50 0.0238 0.24 I Q I V I 3+51 0.0242 0.26 I 0 I V I 3+52 0.0246 0.28 I 0 I V I 3+53 0.0250 0.31 I 0 I V I 3+54 0.0254 0.33 I 0 I V I 3+55 0.0259 0.35 I 0 I V I 3+56 0.0264 0.38 I Q I V I 3+57 0.0270 0.41 I 01 VI 3+58 0.0276 0.44 I 01 VI 3+59 0.0282 0.47 I Q V 4+ 0 0.028.9 0.49 I 10 V 4+ 1 0.0300 0.75 I I 0 IV 4+ 2 0.0313 1.00 I I I Q 4+ 3 0.0331 1.26 I I I V 4+ 4 0.0352 1.51 I I I .4+ 5 0.0376 1.77 I I I 4+ 6 0.0396 1.47 I I I 4+ 7 0.0412 1.17 I I I 4+ 8 0.0424 0.88 I I 01 4+ 9 0.0432 0.58 I I 0 I 4+10 0.0436 0.28 I 0 I I 4+11 0.0440 0.26 I 0 I I 4+12 0.0443 0.24 I 0 I I 4+13 0.0446 0.23 I 0 I I 4+14 0.0449 0.21 I 0 I I 4+15 0.0452 0.19 I 0 I I 4+16 0.0454 0.18 I o I I 4+17 0.0457 0.17 I 0 I I 4+18 0.0459 0.16 I 0 I I 4+19 0.0461 0.16 I 0 I I 4+20 0.0463 0.15 I Q I I 4+21 0.0465 0.14 I 0 I I 4+22 0.0467 0.14 I 0 I I 4+23 0.0469 0.13 I 0 I I 4+24 0.0471 0.13 I 0 I I 4+25 0.0472 0.12 I o I I 4+26 0.0474 0.12 I o I I 4+27 0.0476 0.12 I 0 I I 4+28 0.0477 0.11 I 0 I I 4+29 0.0479 0.11 I 0 I I 4+30 0.0480 0.11 I 0 I I 4+31 0.0482 0.10 I 0 I I 4+32 0.0483 0.10 I 0 I I 4+33 0.0484 0.10 I 0 I I 4+34 0.0486 0.10 I 0 I I 4+35 0.0487 0.10 I 0 I I 4+36 0.0488 0.09 I o I I 4+37 0.0490 0.09 I 0 I I 4+38 0.0491 0.09 I o I I 4+39 0.0492 0.09 I 0 I I 01 V 10 I V 0 VI 0 I O VI I V I V I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I IV I Iv I Iv I Iv I IV I IV I IV I I V I Iv I 4+40 0.0493 0.09 IQ 4+41 0.0494 0.09 IQ 4+42 0.0496 0.08 IQ 4+43 0.0497 0.08 IQ 4+44 0.0498 0.08 IQ 4+45 0.0499 0.08 IQ 4+46 0.0500 0.08 10 4+47 0.0501 0.08 IQ 4+48 0.0502 0.08 IQ 4+49 0.0503 0.08 IQ 4+50 0.0504 0.07 JO 4+51 0.0505 0.07 10 4+52 0.0506 0.07 IQ 4+53 0.0507 0.07 IQ 4+54 0.0508 0.07 10 4+55 0.0509 0.07 10 4+56 0.0510 0.07 JO 4+57 0.0511 0.07 IQ 4+58 0.0512 0.07 IQ 4+59 0.0513 0.07 IQ 5+ 0 0.0514 0.07 IQ 5+ 1 0.0515 0.06 IQ 5+ 2 0.0515 0.06 10 5+ 3 0.0516 0.06 IQ 5+ 4 0.0517 0.06 IQ 5+ 5 0.0518 0.06 JO 5+ 6 0.0519 0.06 JO 5+ 7 0.0520 0.06 IQ 5+ 8 0.0521 0.06 IQ 5+ 9 0.0521 0.06 JO 5+10 0.0522 0.06 IQ 5+11 0.0523 0.06 IQ 5+12 0.0524 0.06 IQ 5+13 0.0525 0.06 10 5+14 0.0525 0.06 10 5+15 0.0526 0.06 IQ 5+16 0.0527 0.06 IQ 5+17 0.0528 0.06 10 5+18 0.0528 0.05 10 5+19 0.0529 0.05 IQ 5+20 0.0530 0.05 10 5+21 0.0531 0.05 IQ 5+22 0.0531 0.05 IQ 5+23 0.0532 0.05 JO 5+24 0.0533 0.05 10 5+25 0.0533 0.05 IQ 5+26 0.0534 0.05 JO 5+27 0.0535 0.05 IQ 5+28 0.0536 0.05 IQ 5+29 0.0536 0.05 IQ 5+30 0.0537 0.05 IQ 5+31 0.0538 0.05 Jo 5+32 0.0538 0.05 IQ 5+33 0.0539 0.05 10 5+34 0.0540 0.05 IQ 5+35 0.0540 0.05 10 5+36 0.0541 0.05 10 5+37 0.0542 0.05 IQ 5+38 0.0542 0.05 IQ 5+39 0.0543 0.05 IQ 5+40 0.0543 0.05 IQ I I I 5+41 0.0544 0.05 IQ I I I 5+42 0.0545 0.05 IQ I I I 5+43 0.0545 0.05 10 I I I 5+44 0.0546 0.04 IQ I I I 5+45 0.0547 0.04 IQ 5+46 0.0547 0.04 10 I I I 5+47 0.0548 0.04 0 I I I 5+48 0.0548 0.04 Q I I I 5+49 0.0549 0.04 Q I I I 5+50 0.0550 0.04 Q I I I 5+51 0.0550 0.04 Q I I I 5+52 0.0551 0.04 Q I I I 5+53 0.0551 0.04 Q I I 5+54 0.0552 0.04 Q I I I 5+55 0.0553 0.04 Q I I I 5+56 0.0553 0.04 Q I I I 5+57 0.0554 0.04 Q I I I 5+58 0.0554 0.04 Q I I I 5+59 0.0555 0.04 Q I I I 6+ 0 0.0555 0.04 Q I I I 6+ 1 0.0556 0.04 0 I I I 6+ 2 0.0556 0.04 0 I I I 6+ 3 0.0557 0.04 0 I I I 6+ 4 0.0558 0.04 0 I I I 6+ 5 0.0558 0.04 I I I Q----------------------------------------------------------------------- VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI VI V End of computations, total study area = 0.390 (Ac.) tJ1!1 11 'IJ HYDROLOGY MAPS