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HomeMy WebLinkAboutWPO201600035 Plan - Submittal (First) 2016-05-03DA-1 A DA-1 OFFSI E DA-1A Post -Development -1 BV-PASS 1 By -Pass 1 EASS 2 \ BY-PASS 2 e- BY-PASS 3 BASIN II) a PRE -DE OPMENT CON ITION PRE PRE -DEVELOPMENT CONDITION DA-2 DA-3 POST-DEV LOPMENT D 2 POST-DEV LOPMENT Dr A A BV-PAS54 SWM/ SW /BMP 2 P3 (BIO-RE ENTION DA-4 (BIO- ETENTION ILTER ILTER) 1 R /DA-4 3Y-P S 4 CS/ EX. STREAM BV-PASS 5 ZM(RETENTIONBASIN \\ WM/BP4 BY-PASS$1 II) AP-3 AP-2 ANALYSIS POINT 3 BV-PASS 8 e/BY-PASS 6 �1 ANALYSIS POI T 2 ANALYSIS POINT 1 POST -DEVELOPMENT CONDITION Subcat Reach on Link B -PASS 7 Q� DA-5 DA-5 ZSWM/BMP5 (BIO-RETENTION AP-4 FILTER) ANALYSIS POINT 4 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 2 Area Listing (all nodes) Area (acres) CN Description (subcatchment-numbers) 6.190 72 1/3 acre lots, 30% imp, HSG B (BY-PASS 7) 23.885 75 1/4 acre lots, 38% imp, HSG B (BY-PASS 1, BY-PASS 3, BY-PASS 4, DA-1, DA-2, DA-3, DA-4) 0.400 85 1/8 acre lots, 65% imp, HSG B (BY-PASS 5) 1.400 61 >75% Grass cover, Good, HSG B (DA-3, DA-5) 37.430 67 Brush, Poor, HSG B (PRE) 3.090 75 Commercial, 50% imp, HSG B (DA-4) 4.820 85 Gravel roads, HSG B (DA-1) 3.830 58 OFFSITE AREA DRAINING TO BMP 1 (DA-1 A) 0.760 85 ROW, HSG B (DA-3) 10.000 85 Road ROW, HSG B (BY-PASS 1, BY-PASS 7, DA-2, DA-4, DA-5) 61.240 55 Woods, Good, HSG B (BY-PASS 1, BY-PASS 4, BY-PASS 5, BY-PASS 7, DA-1, DA-2, DA-4, PRE) 1.210 58 Woods/grass comb., Good, HSG B (BY-PASS 6) 0.160 64 lots, 10% imp, HSG B (BY-PASS 2) 13.670 85 residential, 65% imp, HSG B (DA-4) 168.085 67 TOTAL AREA J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 C 2014 HydroCAD Software Solutions LLC Pate 3 Pipe Listing (all nodes) Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 SWM/BMP1 439.00 434.00 78.9 0.0634 0.013 42.0 0.0 0.0 2 SWM/BMP4 422.00 418.00 120.5 0.0332 0.011 42.0 0.0 0.0 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 4 Time span=5.00-120.00 hrs, dt=0.05 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment BY-PASS 1: By -Pass 1 Runoff Area=0.840 ac 20.36% Impervious Runoff Depth=1.03" Flow Length=334' Tc=14.0 min CN=69 Runoff=1.08 cfs 0.072 of Subcatchment BY-PASS 2: BY-PASS 2 Runoff Area=0.160 ac 10.00% Impervious Runoff Depth=0.77" Flow Length=145' Slope=0.0450'/' Tc=9.0 min CN=64 Runoff=0.17 cfs 0.010 of SubcatchmentBY-PASS 3: BY-PASS 3 Runoff Area=1.415 ac 38.00% Impervious Runoff Depth=1.39" Flow Length=325' Tc=5.5 min CN=75 Runoff=3.45 cfs 0.164 of SubcatchmentBY-PASS 4: BY-PASS 4 Runoff Area=0.720 ac 19.53% Impervious Runoff Depth=0.82" Flow Length=407' Tc=30.5 min CN=65 Runoff=0.42 cfs 0.049 of Subcatchment BY-PASS 5: BY-PASS 5 Runoff Area=3.280 ac 7.93% Impervious Runoff Depth=0.54" Flow Length=214' Tc=16.7 min CN=59 Runoff=1.54 cfs 0.148 of SubcatchmentBY-PASS 6: BY-PASS 6 Runoff Area=1.210 ac 0.00% Impervious Runoff Depth=0.50" Flow Length=275' Tc=12.8 min CN=58 Runoff=0.59 cfs 0.051 of Subcatchment BY-PASS 7: BY-PASS 7 Runoff Area=9.090 ac 20.43% Impervious Runoff Depth=0.97" Flow Length=580' Tc=54.9 min CN=68 Runoff=4.36 cfs 0.736 of SubcatchmentDA-1: Post-DevelopmentDA-1 Runoff Area=21.210 ac 19.64% Impervious Runoff Depth=1.20" Flow Length=874' Tc=36.6 min CN=72 Runoff=17.93 cfs 2.121 of SubcatchmentDA-IA: OFFSITE DA-IA Runoff Area=3.830 ac 0.00% Impervious Runoff Depth=0.50" Flow Length=1,02P Tc=52.4 min CN=58 Runoff=0.72 cfs 0.160 of SubcatchmentDA-2: POST-DEVELOPMENTDA-2 Runoff Area=3.810 ac 23.34% Impervious Runoff Depth=1.59" Flow Length=750' Tc=14.3 min CN=78 Runoff=7.92 cfs 0.505 of SubcatchmentDA-3: POST-DEVELOPMENTDA-3 Runoff Area=2.760 ac 22.03% Impervious Runoff Depth=1.45" Flow Length=361' Tc=11.6 min CN=76 Runoff=5.73 cfs 0.334 of SubcatchmentDA-4: DA-4 Runoff Area=35.360 ac 36.75% Impervious Runoff Depth=1.59" Flow Length=1,338' Tc=37.4 min CN=78 Runoff=41.08 cfs 4.683 of SubcatchmentDA-5: DA-5 Runoff Area=2.240 ac 0.00% Impervious Runoff Depth=1.32" Flow Length=89' Slope=0.1400 7' Tc=5.6 min CN=74 Runoff=5.17 cfs 0.247 of SubcatchmentPRE: PRE -DEVELOPMENT Runoff Area=82.160 ac 0.00% Impervious Runoff Depth=0.58" Flow Length=1,102' Tc=63.5 min CN=60 Runoff=17.18 cfs 3.999 of Reach 1R: EX. STREAM Avg. Flow Depth=0.13' Max Vet=1.94 fps Inflow=5.20 cfs 0.284 of n=0.040 L=650.0' 5=0.0415 '/' Capacity=2,220.75 cfs Outflow=4.05 cfs 0.284 of Pond SWM/BMPI: SWMBMP1(RETENTION Peak Elev=447.05' Storage=127,724 cf Inflow=18.38 cfs 2.281 of Outflow=1.91 cfs 2.276 of J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 5 Pond SWM/BMP2: SWMIBMP 2 (BIO-RETENTION Peak Elev=501.33' Storage=5,712 cf Inflow=7.92 cfs 0.505 of Outflow=6.70 cfs 0.409 of Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION Peak Elev=462.39' Storage=3,156 cf Inflow=5.73 cfs 0.334 of Outflow=5.20 cfs 0.284 of Pond SWM/BMP4: SWMBMP4 (RETENTION Peak Elev=433.64' Storage=286,850 cf Inflow=44.33 cfs 4.967 of Primary=3.39 cfs 4.955 of Secondary=0.00 cfs 0.000 of Outflow=3.39 cfs 4.955 of Pond SWM/BMPS: SWMIBMPS (BIO-RETENTION Peak Elev=438.63' Storage=3,460 cf Inflow=5.17 cfs 0.247 of Outflow=4.64 cfs 0.247 of Link AP-1: ANALYSIS POINT 1 Link AP-2: ANALYSIS POINT 2 Link AP-3: ANALYSIS POINT 3 Link AP-4: ANALYSIS POINT 4 Link PROJECT -POST: POST-DEVELOPMENTCONDITION Link PROJECT -PRE: PRE-DEVELOPMENTCONDITION Inflow=4.37 cfs 2.521 of Primary=4.37 cfs 2.521 of Inflow=7.00 cfs 0.458 of Primary=7.00 cfs 0.458 of Inflow=3.52 cfs 5.103 of Primary=3.52 cfs 5.103 of Inflow=4.64 cfs 0.247 of Primary=4.64 cfs 0.247 of Inflow=15.25 cfs 9.116 of Primary=15.25 cfs 9.116 of Inflow=17.18 cfs 3.999 of Primary=17.18 cfs 3.999 of Total Runoff Area = 168.085 ac Runoff Volume=13.278 of Average Runoff Depth = 0.95" 87.13% Pervious=146.445 ac 12.87% Impervious = 21.640 ac J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 6 Summary for Subcatchment BY-PASS 1: By -Pass 1 Runoff = 1.08 cfs @ 12.07 hrs, Volume= 0.072 at, Depth= 1.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 0.300 55 Woods, Good, HSG B 0.450 75 1/4 acre lots, 38% imp, HSG B * 0.090 85 Road ROW, HSG B 0.840 69 Weighted Average 0.669 79.64% Pervious Area 0.171 20.36% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 87 0.0500 0.12 Sheet Flow, sheet flow Woods: Light underbrush n= 0.400 P2= 3.62" 1.5 247 0.0150 2.79 18.68 Channel Flow, Area-- 6.7 sf Perim= 21.5' r= 0.3 P n= 0.030 Earth. Lyrassed & windine 14.0 334 Total Subcatchment BY-PASS 1: By -Pass 1 Hydrograph 1.08 cfs — — I — IType fl-24- r 1 2-year Rainfpll=3�62" Runoff Area=0.849 ac �unoif Voiume�0.072 of Runoff Depth=1 �03" o Fi r Length=P4' Tc=14.0 in CN*69 0 U�Z71 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 7 Summary for Subcatchment BY-PASS 2: BY-PASS 2 Runoff = 0.17 cfs @ 12.02 hrs, Volume= 0.010 af, Depth= 0.77" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description * 0.160 64 lots, 10% imp, HSG B 0.144 90.00% Pervious Area 0.016 10.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 145 0.0450 0.27 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" 0.1 0.1 MK8XV1. N Subcatchment BY-PASS 2: BY-PASS 2 Hydrograph -Typ� II-24-hr 2-Year I lnf�11=3.162" Runoff Area=0.169 ac liunoff V01-me=0.01-0 of —f -Rpr off-Depth=OJT� Flow Len th= 45' Slope 6.045 T C- N=64 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) ❑ Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 8 Summary for Subcatchment BY-PASS 3: BY-PASS 3 Runoff = 3.45 cfs @ 11.97 hrs, Volume= 0.164 af, Depth= 1.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 1.415 75 1/4 acre lots, 38% imp, HSG B 0.877 62.00% Pervious Area 0.538 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.9 101 0.1000 0.35 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" 0.6 224 0.0100 6.16 7.39 Channel Flow, CHANNEL FLOW Area-- 1.2 sf Perim= 3.9' r= 0.3 P n= 0.011 Concrete pipe, straight & clean 5.5 325 Total 3.45 cfs 3 1 h 2 0 FL 1 0 Subcatchment BY-PASS 3: BY-PASS 3 Hydrograph Type II 24-hr -)�e—arIRainfpll=3�62" Ru off Area=1.41 ac f�uno Vollume 0.16: of —Runoff Depth-1 �39" Flow Length= 25' Tc--5.5 in CN*75 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 9 Summary for Subcatchment BY-PASS 4: BY-PASS 4 Runoff = 0.42 cfs @ 12.29 hrs, Volume= 0.049 af, Depth= 0.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 0.350 55 Woods, Good, HSG B 0.370 75 1/4 acre lots, 38% imp, HSG B 0.720 65 Weighted Average 0.579 80.47% Pervious Area 0.141 19.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.5 300 0.0700 0.17 Sheet Flow, sheet flow Woods: Light underbrush n= 0.400 P2= 3.62" 1.0 107 0.1400 1.87 Shallow Concentrated Flow, Shallow Concenetrated Flow Woodland Kv= 5.0 fns 30.5 407 Total Subcatchment BY-PASS 4: BY-PASS 4 Hydrograph o. 0.42 cfs 1 0.4 �Typ� 11-24-Kr- 2-Year "nf�11=,IP " 0.35 Runoff Area=0.72QQ ac 0.3 Runoff Voli me0.049 of 0.25 -f-Rpnof1-Bep�h= 182''- 3 � Ftow_Le�th_= j0 0 0.2 Tc- 0.5 inin 0.15 1 CN065 0.1 0.05 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment BY-PASS 5: BY-PASS 5 Runoff = 1.54 cfs @ 12.13 hrs, Volume= 0.148 af, Depth= 0.54" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 2.880 55 Woods, Good, HSG B 0.400 85 1/8 acre lots, 65% imp, HSG B 3.280 59 Weighted Average 3.020 92.07% Pervious Area 0.260 7.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 123 0.2000 0.12 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 0.2 91 0.0670 8.34 200.22 Channel Flow, cHANNEL fLOW Area-- 24.0 sf Perim-- 29.7' r= 0.8l' n= 0.040 Mountain streams 16.7 214 Total 0 Subcatchment BY-PASS 5: BY-PASS 5 Hydrograph 1 1.54 cfs 1 Type II 24-hr 2-year Rainfpll=3�62" Runoff Area=3.28Q ac Runof�/olum��0�148 of Runoff Depth=0�54" Flow Length=�4' Tc=16.7 i n CN*59 10 20 30 40 50 60 70 80 90 100 110 120 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 (0 2014 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment BY-PASS 6: BY-PASS 6 Runoff = 0.59 cfs @ 12.08 hrs, Volume= 0.051 af, Depth= 0.50" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 1.210 58 Woods/grass comb., Good, HSG B 1.210 100.00% Pervious Area Tc Length min) (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 8.0 50 0.2000 0.10 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.8 225 0.0240 0.77 Shallow Concentrated Flow, SHALLOW CONCENTRATED FLOW Woodland Kv= 5.0 fns 12.8 275 Total Subcatchment BY-PASS 6: BY-PASS 6 Hydrograph 0.1 0.59 0.55 cfs 0.5 0.45 0.4 0.35 0 0.3 _ FL 0.25 0.2 0.15 L 1 1 0.1 0.05 t _ I I— I I I 4yp� III-h-r wear "nf�II=I1621' Runoff Area=1. ac Run-off Vol urne 0.0 of R0nao"epth=0.P0" Ftowte�th=37� c 2.9- In I— rt CNOW L 1 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 (0 2014 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment BY-PASS 7: BY-PASS 7 Runoff = 4.36 cfs @ 12.62 hrs, Volume= 0.736 af, Depth= 0.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 2.320 55 Woods, Good, HSG B 6.190 72 1/3 acre lots, 30% imp, HSG B * 0.580 85 Road ROW, HSG B 9.090 68 Weighted Average 7.233 79.57% Pervious Area 1.857 20.43% Impervious Area Tc min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 53.7 300 0.0625 0.09 Sheet Flow, sheet flow Woods: Dense underbrush n= 0.800 P2= 3.62" 1.2 280 0.6250 3.95 Shallow Concentrated Flow, SHALLOW CONCENTRATED FLOW Woodland Kv= 5.0 fns 54.9 580 Total Subcatchment BY-PASS 7: BY-PASS 7 Hydrograph 4.36 cfs 0 Runoff Type 12"- r 4 2-year Rainfpll=3�62" Runoff � rear�9.09Q ac unoffVo u m 0-13 f 3I Runoff Depth=0�97" Flo Length=Lin 0' 2 Tc=54.9 CN*68 1 1 iiiii �iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii 10 20 30 40 50 60 70 80 90 100 110 120 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 13 Summary for Subcatchment DA-1: Post -Development DA-1 Runoff = 17.93 cfs @ 12.35 hrs, Volume= 2.121 af, Depth= 1.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 5.430 55 Woods, Good, HSG B 10.960 75 1/4 acre lots, 38% imp, HSG B 4.820 85 Gravel roads, HSG B 21.210 72 Weighted Average 17.045 80.36% Pervious Area 4.165 19.64% Impervious Area Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 34.7 174 0.0625 0.08 Sheet Flow, Sheet Flow Woods: Dense underbrush n= 0.800 P2= 3.62" 1.9 700 0.0100 6.03 10.85 Channel Flow, Channel Flow Area-- 1.8 sf Perim= 4.7' r= 0.38' n= 0.013 36.6 874 Total 1 17.93 cfs I 16 14 12 10 3 8 Subcatchment DA-1: Post -Development DA-1 Hydrograph ITyp� II 24-hr 2-YOar RainfO11=162" I uno� Arga=21.219 ac RunoffVolme=2.121-af -R�-no"epih=1.LO" Howlenjth-674' -tTc—q" rM n __� I _CN772 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 14 Summary for Subcatchment DA-IA: OFFSITE DA-1A Runoff = 0.72 cfs @ 12.67 hrs, Volume= 0.160 af, Depth= 0.50" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description * 3.830 58 OFFSITE AREA DRAINING TO BMP1 3.830 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 44.5 300 0.1000 0.11 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.7 96 0.0185 0.34 Shallow Concentrated Flow, SHALLOW CONCENTRATED Forest w/Heavy Litter Kv= 2.5 fps 3.2 625 0.0500 3.30 90.66 Channel Flow, CHANNEL FLOW Area-- 27.5 sf Perim-- 110.0' r= 0.25' n= 0.040 Mountain streams 52.4 1,021 Total Subcatchment DA-IA: OFFSITE DA-1A Hydrograph 0 �.72 cfs r— T I 0 Runoff 0.7 �—Typ� II 24-hr 2-Year F�tainf�ll 3.16 " 0.6 Runoff Area=3.839 ac Aunofif V-ol-me---�0.1-60 of 0.5 -L --i Runoff Depth=0.§0" 3 0.4 1' Flow LengtLh=ltm o Tc=52. 0.3 CN058 0.2- 0.173/ 1 ' ' . ' 1 ' ' . . 1 . . . . , . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment DA-2: POST -DEVELOPMENT DA-2 Runoff = 7.92 cfs @ 12.07 hrs, Volume= 0.505 af, Depth= 1.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 0.120 55 Woods, Good, HSG B 2.340 75 1/4 acre lots, 38% imp, HSG B * 1.350 85 Road ROW, HSG B 3.810 78 Weighted Average 2.921 76.66% Pervious Area 0.889 23.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.6 138 0.1250 0.18 Sheet Flow, SHEET FLOW Woods: Light underbrush n= 0.400 P2= 3.62" 1.7 612 0.0100 6.16 7.39 Channel Flow, CHANNEL Area-- 1.2 sf Perim= 3.9' r= 0.3 P n= 0.011 Concrete nine. straiaht & clean 14.3 750 Total Subcatchment DA-2: POST -DEVELOPMENT DA-2 Hydrograph 7.92 cfs 1 Type II 24-hr 7 2-year Fainf�11=3�62" u Hoff Area=3.A1 "C 6 I I uno4 Vollumel0.505 of 5 Runoff Depth=1 �59" 3 4iov�r Len gth=5fl' ° Tc=14.3 in 3 1 1 CN*78 2 1 0 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment DA-3: POST -DEVELOPMENT DA-3 Runoff = 5.73 cfs @ 12.04 hrs, Volume= 0.334 af, Depth= 1.45" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 0.400 61 >75% Grass cover, Good, HSG B 1.600 75 1/4 acre lots, 38% imp, HSG B * 0.760 85 ROW, HSG B 2.760 76 Weighted Average 2.152 77.97% Pervious Area 0.608 22.03% Impervious Area Tc Length (min) (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 7.2 130 0.0625 0.30 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" 4.4 231 0.0500 0.88 9.67 Channel Flow, Channelized flow Area-- 11.0 sf Perim-- 44.0' r= 0.25' n= 0.150 Sheet flow over Short Grass 11.6 361 Total Subcatchment DA-3: POST -DEVELOPMENT DA-3 Hydrograph 5.73 cfs Type II 24-hr 5 2-YI ear l�aifif�ll=3�62" Runoff Area=2.76 ac 4 unoif-Volu me�0_334af Runoff Depth=1 �45" 0 3 Flow Len�gt�i=� 1' a Tc=l1l 1.6 in 2 1 Z`M*_7s 1 1 20 30 40 50 60 70 80 90 100 110 120 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment DA-4: DA-4 Runoff = 41.08 cfs @ 12.35 hrs, Volume= 4.683 at, Depth= 1.59" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 5.110 55 Woods, Good, HSG B 6.750 75 1/4 acre lots, 38% imp, HSG B * 6.740 85 Road ROW, HSG B * 13.670 85 residential, 65% imp, HSG B * 3.090 75 Commercial, 50% imp, HSG B 35.360 78 Weighted Average 22.364 63.25% Pervious Area 12.995 36.75% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 34.9 248 0.1250 0.12 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 2.5 1,090 0.0415 7.18 330.40 Channel Flow, CHANNEL FLOW Area-- 46.0 sf Perim-- 35.6' r= 1.29' n= 0.050 Mountain streams w/larize boulders 37.4 1,338 Total 1 41.08 cfs 2 3 0 2 FL 1 1 Subcatchment DA-4: DA-4 Hydrograph -Type II 24--hr rt 2=Y$ar Rain#OIF=3.0211 Ru+o Ama=3 -36 c Runoff Volue4.6of Roff�Dep h=1.'59" Flbw Llength=1,338' —Tc=37--4 �ii n -CN =--78 10 20 30 41 50 60 70 81 91 11 1 120 ❑ Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 (0 2014 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment DA-5: DA-5 Runoff = 5.17 cfs @ 11.97 hrs, Volume= 0.247 at, Depth= 1.32" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 1.000 61 >75% Grass cover, Good, HSG B * 1.240 85 Road ROW, HSG B 2.240 74 Weighted Average 2.240 100.00% Pervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 5.6 89 0.1400 0.26 Sheet Flow, sheet flow Grass: Dense n= 0.240 P2= 3.62" Subcatchment DA-5: DA-5 Hydrograph 5.17 cfs 5 +Type II 24-hr 2-Yj ear Rainfpll=3�62" 4 - Runoff -4rea=2�4Q ac Runoff Volume=0.247 of 3 - Runoff Depth=1 �32" FlowI Le gth=89' U- Sllop� .14d0-y 2 I T&5.6 knin CN-74 1 10 20 30 40 50 60 70 80 90 100 110 120 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 19 Summary for Subcatchment PRE: PRE -DEVELOPMENT CONDITION Runoff = 17.18 cfs @ 12.81 hrs, Volume= 3.999 af, Depth= 0.58" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 2-Year Rainfall=3.62" Area (ac) CN Description 44.730 55 Woods, Good, HSG B 37.430 67 Brush, Poor, HSG B 82.160 60 Weighted Average 82.160 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 58.7 300 0.0500 0.09 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.0 300 0.0625 1.25 Shallow Concentrated Flow, SHALLOW CONCENTARTED FLOW Woodland Kv= 5.0 fps 0.8 502 0.0500 10.99 104.39 Channel Flow, CHANNEL FLOW Area-- 9.5 sf Perim= 38.0' r= 0.25' n= 0.012 63.5 1,102 Total Subcatchment PRE: PRE -DEVELOPMENT CONDITION Hydrograph I 0 Runoff 7.18 cfs — L -iTyp� W24-hr 16 2-Yoar Rainfol[=-3.62" 14 4 Runo _1-%7 81 — ac N 12 Runoff Volume=3.999 of 3 10 i R�off�Depth=0.�8" 0 —FI6w Uengtfi= I J02' 8 6 F- - F- -TTc=¢3:5 pA n w — 1 -1 — I -CN = 60 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 20 Summary for Reach 1R: EX. STREAM Inflow Area = 2.760 ac, 22.03% Impervious, Inflow Depth = 1.24" for 2-Year event Inflow = 5.20 cfs @ 12.09 hrs, Volume= 0.284 of Outflow = 4.05 cfs @ 12.26 hrs, Volume= 0.284 af, Atten= 22%, Lag= 10.3 min Routing by Stor-Ind+Trans method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Max. Velocity= 1.94 fps, Min. Travel Time= 5.6 min Avg. Velocity = 1.04 fps, Avg. Travel Time= 10.4 min Peak Storage= 1,370 cf @ 12.17 hrs Average Depth at Peak Storage= 0.13' Bank -Full Depth= 5.00' Flow Area-- 130.0 sf, Capacity= 2,220.75 cfs 16.00' x 5.00' deep channel, n= 0.040 Mountain streams Side Slope Z-value= 2.0 7' Top Width= 36.00' Length= 650.0' Slope= 0.0415 '/' Inlet Invert= 452.00', Outlet Invert= 425.00' I Reach 1R: EX. STREAM Hydrograph 5.20 cfs tflow Xrea=�_.760�ac 4.05 cfs I Ayg. Flow iDepth=0�13' 4 I IYlax �/e1= I fps .. n=0.040 T- —1 L=656.0' o L --I I S_= OI441#6'/' 2 gapa�lty=?,229.75 pfs 1 10 20 30 40 50 60 70 80 90 100 110 120 Inflow ❑ Outflow J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 21 5 Ci 1 we 5 M. 3 a� a 2 0 1 Reach 1R: EX. STREAM Stage -Discharge 500 1,000 1,500 2,000 Discharge (cfs) Reach 1R: EX. STREAM Stage -Storage 10,00020,00030,000 40,00050,00060,00070,00080,000 Storage (cubic -feet) ❑ Primary ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 22 Summary for Pond SWM/BMP1: SWMBMPI (RETENTION BASIN II) Inflow Area = 25.040 ac, 16.63% Impervious, Inflow Depth = 1.09" for 2-Year event Inflow = 18.38 cfs @ 12.36 hrs, Volume= 2.281 of Outflow = 1.91 cfs @ 14.63 hrs, Volume= 2.276 af, Atten= 90%, Lag= 136.4 min Primary = 1.91 cfs @ 14.63 hrs, Volume= 2.276 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 445.00' Surf.Area= 20,329 sf Storage= 74,248 cf Peak Elev= 447.05' @ 14.63 hrs Surf.Area= 29,616 sf Storage= 127,724 cf (53,477 cf above start) Plug -Flow detention time=1,522.9 min calculated for 0.571 of (25% of inflow) Center -of -Mass det. time= 576.9 min ( 1,467.6 - 890.7 ) Volume Invert Avail.Storage Storage Description #1 439.00' 226,253 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 439.00 8,520 0 0 440.00 9,597 9,059 9,059 441.00 10,717 10,157 19,216 442.00 11,899 11,308 30,524 443.00 13,148 12,524 43,047 444.00 14,462 13,805 56,852 445.00 20,329 17,396 74,248 446.00 26,975 23,652 97,900 447.00 29,477 28,226 126,126 448.00 32,039 30,758 156,884 449.00 34,672 33,356 190,239 450.00 37,355 36,014 226,253 Device Routing Invert Outlet Devices #1 Primary 439.00' 42.0" Round Barrel (Culvert) L= 78.9' RCP, sq.cut end projecting, Ke= 0.500 Inlet / Outlet Invert= 439.00' / 434.00' S= 0.0634'/' Cc= 0.900 n= 0.013, Flow Area= 9.62 sf #2 Device 1 445.00' 6.0" Vert. Orifice C= 0.600 #3 Device 1 447.00' 48.0" Horiz. Riser C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.79 cfs @ 14.63 hrs HW=447.05' (Free Discharge) L1=Barrel (Culvert) (Passes 1.79 cfs of 116.31 cfs potential flow) E2=Orifice (Orifice Controls 1.27 cfs @ 6.47 fps) 3=Riser (Weir Controls 0.52 cfs @ 0.76 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 23 Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Hydrograph 18.38 cfs - — Inflow 2 � Ir�iflo� Are1a=25.04�ac ❑ Primary 1 Poak glev�447.p5' 16 L A = S�?ragrl2T72� cf 14 - 12 - u. 8 1.91 cfs 450 449 448 447 a 446 c 445 0 444 443 w 442 441 440 439 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Stage -Discharge Riser - - Orifice Barrel (Culvert) 0 20 40 60 80 100 Discharge (cfs) ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 24 450 446 444 a� w 442 ►„e Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Stage -Area -Storage Surface/Horizontal[Wetted Area (so-ft) 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 0 50,000 100,000 150,000 200,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 25 Summary for Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Inflow Area = 3.810 ac, 23.34% Impervious, Inflow Depth = 1.59" for 2-Year event Inflow = 7.92 cfs @ 12.07 hrs, Volume= 0.505 of Outflow = 6.70 cfs @ 12.15 hrs, Volume= 0.409 af, Atten= 15%, Lag= 4.7 min Primary = 6.70 cfs @ 12.15 hrs, Volume= 0.409 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 501.33' @ 12.15 hrs Surf.Area= 4,857 sf Storage= 5,712 cf Plug -Flow detention time=125.0 min calculated for 0.409 of (81% of inflow) Center -of -Mass det. time= 41.7 min ( 888.7 - 847.0 ) Volume Invert Avail.Storage Storage Description #1 500.00' 12,023 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 500.00 3,783 0 0 501.00 4,575 4,179 4,179 502.00 5,441 5,008 9,187 502.50 5,902 2,836 12,023 Device Routing Invert Outlet Devices #1 Primary 501.00' Custom Weir/Orifice, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 10.00 19.00 Primary Outflow Max=6.64 cfs @ 12.15 hrs HW=501.32' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 6.64 cfs @ 1.87 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 26 Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Hydrograph 1 7.92 cfs 1 6.70 cfs N 5 _0 4 3 2 1 0 502 Q 2 0 _ a 501 w 500 0 Inflow Inflov4 Aria=3181 01 ac ❑ Primary Peek Elev=501.33' Storage=51,71 -Cr 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Stage -Discharge 10 20 30 40 50 Discharge (cfs) 60 70 80 ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 27 502 0 501 a� w 500 7 Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (sq-ft) 0 1,000 2,000 3,000 4,000 5,000 Custom Stage Data 5,000 10,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page �8 Summary for Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION FILTER) Inflow Area = 2.760 ac, 22.03% Impervious, Inflow Depth = 1.45" for 2-Year event Inflow = 5.73 cfs @ 12.04 hrs, Volume= 0.334 of Outflow = 5.20 cfs @ 12.09 hrs, Volume= 0.284 af, Atten= 9%, Lag= 3.0 min Primary = 5.20 cfs @ 12.09 hrs, Volume= 0.284 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 462.39' @ 12.09 hrs Surf.Area= 2,677 sf Storage= 3,156 cf Plug -Flow detention time=103.0 min calculated for 0.284 of (85% of inflow) Center -of -Mass det. time= 33.3 min ( 883.8 - 850.5 ) Volume Invert Avail.Storage Storage Description #1 461.00' 6,517 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 461.00 1,889 0 0 462.00 2,441 2,165 2,165 463.00 3,050 2,746 4,911 463.50 3,375 1,606 6,517 Device Routing Invert Outlet Devices #1 Primary 462.00' Custom Weir/Orifice, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 5.00 19.00 Primary Outflow Max=5.10 cfs @ 12.09 hrs HW=462.38' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 5.10 cfs @ 1.96 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 29 Pond SWMBMP3: SWM/BMP3 (BIO-RETENTION FILTER) Hydrograph 5.73 cfs — — —I _ I_ Inflow -y— I I f I I Inlflov� Area=217601 ac ❑ Primary 5.2 05 1 1 1 PeAk Elev=462.39' Stor a=3 156 cf � I I fi � 4 L I - 0 3 F 2 C 0 a 462 w M 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION FILTER) Stage -Discharge 10 20 30 40 50 60 Discharge (cfs) ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam 463 0 462 a� w 461 Pond SWMBMP3: SWM/BMP3 (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (so-ft) 0 500 1,000 1,500 2,000 2,500 3,000 0 2,000 4,000 6,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 31 Summary for Pond SWM/BMP4: SWMBMP4 (RETENTION BASIN II) Inflow Area = 38.120 ac, 35.69% Impervious, Inflow Depth = 1.56" for 2-Year event Inflow = 44.33 cfs @ 12.33 hrs, Volume= 4.967 of Outflow = 3.39 cfs @ 15.01 hrs, Volume= 4.955 af, Atten= 92%, Lag= 160.7 min Primary = 3.39 cfs @ 15.01 hrs, Volume= 4.955 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 430.00' Surf.Area= 31,380 sf Storage= 161,961 cf Peak Elev= 433.64' @ 15.01 hrs Surf.Area= 37,344 sf Storage= 286,850 cf (124,889 cf above start) Plug -Flow detention time=1,461.7 min calculated for 1.237 of (25% of inflow) Center -of -Mass det. time= 569.9 min ( 1,440.1 - 870.2 ) Volume Invert Avail.Storage Storage Description #1 422.00' 443,792 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 422.00 14,564 0 0 423.00 15,872 15,218 15,218 424.00 17,203 16,538 31,756 425.00 18,559 17,881 49,637 426.00 19,941 19,250 68,887 427.00 21,343 20,642 89,529 428.00 22,774 22,059 111,587 429.00 23,297 23,036 134,623 430.00 31,380 27,339 161,961 431.00 32,994 32,187 194,148 432.00 34,626 33,810 227,958 433.00 36,279 35,453 263,411 434.00 37,951 37,115 300,526 435.00 39,643 38,797 339,323 436.00 41,352 40,498 379,820 437.00 43,090 42,221 422,041 437.50 43,914 21,751 443,792 Device Routing Invert Outlet Devices #1 Primary 422.00' 42.0" Round Barrell (Culvert) L= 120.5' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 422.00' / 418.00' S= 0.0332 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area-- 9.62 sf #2 Device 1 430.00' 8.0" Vert. Circle Orifice - 2 YR Storm Controlling Structure C= 0.600 #3 Device 1 433.50' 24.0" W x 18.0" H Vert. Square Orifice -10 YR Storm Controlling Structure C= 0.600 #4 Device 1 435.50' 48.0" Horiz. Riser C= 0.600 Limited to weir flow at low heads #5 Secondary 435.50' Emergency Spillway, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 15.00 27.00 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 32 Primary OutFlow Max=3.38 cfs @ 15.01 hrs HW=433.64' (Free Discharge) L=Barrell (Culvert) (Passes 3.38 cfs of 145.66 cfs potential flow) 2=Circle Orifice - 2 YR Storm Controlling Structure(Orifice Controls 3.05 cfs @ 8.75 fps) 3=Square Orifice -10 YR Storm Controlling Structure(Orifice Controls 0.32 cfs @ 1.19 fps) =Riser ( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=430.00' (Free Discharge) T 5=Emergency Spillway ( Controls 0.00 cfs) Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) 44.33 cfs I 45 40 35 4 30 I 3 25 �° 20 15 3.39 cfs lol 0.00 cfs PON Hydrograph ❑ Inflow �nfl Aria=3.120 ac Outflow Peak levl=433 64' Primary + Storag: 186,85b cf C Secondary l l l l l l i 10 20 30 40 50 60 70 80 90 100110 120 Time (hours) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Paae 33 Mil ig15l 432 0 430 a 428 w 426 424 422 L 0 436 434 a� 2 432 c 430 428 w 426 424 422 0 Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) Stage -Discharge ❑ Total ❑ Primary Emergency Spillway - - ❑ Secondary _ Square Orifice - 10 YR Storm Controlling Structure Circle Orifice - 2 YR Storm Controlling Structure Barrell (Culvert) 50 100 150 200 250 Discharge (cfs) Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) Stage -Area -Storage Surface/Horizontal/Wetted Area (sq-ft) 0 10,000 20,000 30,000 40,000 100,000 200,000 300,000 400,000 Storage (cubic -feet) 0 Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 34 Summary for Pond SWM/BMP5: SWM/BMP5 (BIO-RETENTION FILTER) Inflow Area = 2.240 ac, 0.00% Impervious, Inflow Depth = 1.32" for 2-Year event Inflow = 5.17 cfs @ 11.97 hrs, Volume= 0.247 of Outflow = 4.64 cfs @ 12.01 hrs, Volume= 0.247 af, Atten= 10%, Lag= 2.2 min Primary = 4.64 cfs @ 12.01 hrs, Volume= 0.247 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 438.25' Surf.Area= 2,733 sf Storage= 2,367 cf Peak Elev= 438.63' @ 12.01 hrs Surf.Area= 3,025 sf Storage= 3,460 cf (1,093 cf above start) Plug -Flow detention time=143.6 min calculated for 0.193 of (78% of inflow) Center -of -Mass det. time= 9.4 min ( 860.3 - 850.9 ) Volume Invert Avail.Storage Storage Description #1 437.25' 8,361 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 437.25 2,012 0 0 438.00 2,541 1,707 1,707 439.00 3,309 2,925 4,632 440.00 4,149 3,729 8,361 Device Routing Invert Outlet Devices #1 Primary 438.25' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 1.50 Width (feet) 5.00 15.50 Primary Outflow Max=4.54 cfs @ 12.01 hrs HW=438.62' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 4.54 cfs @ 1.92 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam Pond SWMBMPS: SWM/BMP5 (BIO-RETENTION FILTER) Hydrograph 5.17 cfs Inflow 4.64 cfs Inflovv_ Area=2 240 ac Primary Peek Elev=438.63' 4 Storage=31,469 cf T71IT o A L L 2 C „R 439 0 m w 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP5: SWM/BMP5 (BIO-RETENTION FILTER) Stage -Discharge 0 10 20 30 40 50 60 Discharge (cfs) ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam ..R a� 439 0 m w 438 Pond SWMBMPS: SWM/BMPS (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (sq-ft) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 0 2,000 4,000 6,000 8,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 37 Summary for Link AP-1: ANALYSIS POINT 1 Inflow Area = 27.455 ac, 17.81 % Impervious, Inflow Depth > 1.10" for 2-Year event Inflow = 4.37 cfs @ 11.98 hrs, Volume= 2.521 of Primary = 4.37 cfs @ 11.98 hrs, Volume= 2.521 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link AP-1: ANALYSIS POINT 1 Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 38 Summary for Link AP-2: ANALYSIS POINT 2 Inflow Area = 4.530 ac, 22.73% Impervious, Inflow Depth = 1.21" for 2-Year event Inflow = 7.00 cfs @ 12.15 hrs, Volume= 0.458 of Primary = 7.00 cfs @ 12.15 hrs, Volume= 0.458 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link AP-2: ANALYSIS POINT 2 Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 39 Summary for Link AP-3: ANALYSIS POINT 3 Inflow Area = 41.400 ac, 33.49% Impervious, Inflow Depth > 1.48" for 2-Year event Inflow = 3.52 cfs @ 14.94 hrs, Volume= 5.103 of Primary = 3.52 cfs @ 14.94 hrs, Volume= 5.103 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link AP-3: ANALYSIS POINT 3 Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 40 Summary for Link AP-4: ANALYSIS POINT 4 Inflow Area = 2.240 ac, 0.00% Impervious, Inflow Depth = 1.32" for 2-Year event Inflow = 4.64 cfs @ 12.01 hrs, Volume= 0.247 of Primary = 4.64 cfs @ 12.01 hrs, Volume= 0.247 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Link AP-4: ANALYSIS POINT 4 Hydrograph � --r I I T - 4.64 cfs 1r flov� Aria=212401 ac 4 3 o Ifi�IIfi- " 2 1 20 30 40 50 61 70 :1 91 100 110 120 Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 41 Summary for Link PROJECT -POST: POST -DEVELOPMENT CONDITION Inflow Area = 85.925 ac, 25.18% Impervious, Inflow Depth > 1.27" for 2-Year event Inflow = 15.25 cfs @ 12.12 hrs, Volume= 9.116 of Primary = 15.25 cfs @ 12.12 hrs, Volume= 9.116 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link PROJECT -POST: POST -DEVELOPMENT CONDITION Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 2-Year Rainfall=3.62" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 42 Summary for Link PROJECT -PRE: PRE -DEVELOPMENT CONDITION Inflow Area = 82.160 ac, 0.00% Impervious, Inflow Depth = 0.58" for 2-Year event Inflow = 17.18 cfs @ 12.81 hrs, Volume= 3.999 of Primary = 17.18 cfs @ 12.81 hrs, Volume= 3.999 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link PROJECT -PRE: PRE -DEVELOPMENT CONDITION Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 43 Time span=5.00-120.00 hrs, dt=0.05 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment BY-PASS 1: By -Pass 1 Runoff Area=0.840 ac 20.36% Impervious Runoff Depth=2.30" Flow Length=334' Tc=14.0 min CN=69 Runoff=2.54 cfs 0.161 of Subcatchment BY-PASS 2: BY-PASS 2 Runoff Area=0.160 ac 10.00% Impervious Runoff Depth=1.89" Flow Length=145' Slope=0.0450'/' Tc=9.0 min CN=64 Runoff=0.47 cfs 0.025 of SubcatchmentBY-PASS 3: BY-PASS 3 Runoff Area=1.415 ac 38.00% Impervious Runoff Depth=2.83" Flow Length=325' Tc=5.5 min CN=75 Runoff=7.02 cfs 0.333 of SubcatchmentBY-PASS 4: BY-PASS 4 Runoff Area=0.720 ac 19.53% Impervious Runoff Depth=1.97" Flow Length=407' Tc=30.5 min CN=65 Runoff=1.16 cfs 0.118 of Subcatchment BY-PASS 5: BY-PASS 5 Runoff Area=3.280 ac 7.93% Impervious Runoff Depth=1.50" Flow Length=214' Tc=16.7 min CN=59 Runoff=5.56 cfs 0.411 of SubcatchmentBY-PASS 6: BY-PASS 6 Runoff Area=1.210 ac 0.00% Impervious Runoff Depth=1.43" Flow Length=275' Tc=12.8 min CN=58 Runoff=2.22 cfs 0.144 of Subcatchment BY-PASS 7: BY-PASS 7 Runoff Area=9.090 ac 20.43% Impervious Runoff Depth=2.21" Flow Length=580' Tc=54.9 min CN=68 Runoff=11.02 cfs 1.677 of SubcatchmentDA-1: Post-DevelopmentDA-1 Runoff Area=21.210 ac 19.64% Impervious Runoff Depth=2.56" Flow Length=874' Tc=36.6 min CN=72 Runoff=40.50 cfs 4.521 of SubcatchmentDA-IA: OFFSITE DA-1A Runoff Area=3.830 ac 0.00% Impervious Runoff Depth=1.43" Flow Length=1,021' Tc=52.4 min CN=58 Runoff=2.77 cfs 0.456 of SubcatchmentDA-2: POST-DEVELOPMENTDA-2 Runoff Area=3.810 ac 23.34% Impervious Runoff Depth=3.11" Flow Length=750' Tc=14.3 min CN=78 Runoff=15.54 cfs 0.986 of SubcatchmentDA-3: POST-DEVELOPMENTDA-3 Runoff Area=2.760 ac 22.03% Impervious Runoff Depth=2.92" Flow Length=361' Tc=11.6 min CN=76 Runoff=11.58 cfs 0.671 of SubcatchmentDA-4: DA-4 Runoff Area=35.360 ac 36.75% Impervious Runoff Depth=3.11" Flow Length=1,338' Tc=37.4 min CN=78 Runoff=82.04 cfs 9.153 of SubcatchmentDA-5: DA-5 Runoff Area=2.240 ac 0.00% Impervious Runoff Depth=2.74" Flow Length=89' Slope=0.1400'/' Tc=5.6 min CN=74 Runoff=10.73 cfs 0.511 of SubcatchmentPRE: PRE -DEVELOPMENT Runoff Area=82.160 ac 0.00% Impervious Runoff Depth=1.58" Flow Length=1,102' Tc=63.5 min CN=60 Runoff=58.91 cfs 10.802 of Reach 1R: EX. STREAM Avg. Flow Depth=0.23' Max Vet=2.79 fps Inflow=11.28 cfs 0.622 of n=0.040 L=650.0' S=0.0415 '/' Capacity=2,220.75 cfs Outflow=10.30 cfs 0.622 of Pond SWM/BMPI: SWMBMP1(RETENTION Peak Elev=447.69' Storage=146,977 cf Inflow=42.54 cfs 4.977 of Outflow=24.87 cfs 4.971 of J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 44 Pond SWM/BMP2: SWMIBMP 2 (BIO-RETENTIONPeak Elev=501.54' Storage=6,772 cf Inflow=15.54 cfs 0.986 of Outflow=14.99 cfs 0.890 of Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION Peak Elev=462.60' Storage=3,740 cf Inflow=11.58 cfs 0.671 of Outflow --I 1.28 cfs 0.622 of Pond SWM/BMP4: SWMBMP4 (RETENTION Peak Elev=435.61' Storage=363,964 cf Inflow=87.63 cfs 9.775 of Primary=22.24 cfs 9.701 of Secondary=2.20 cfs 0.062 of Outflow=24.44 cfs 9.762 of Pond SWM/BMP5: SWMIBMP5 (BIO-RETENTION Peak Elev=438.85' Storage=4,140 cf Inflow=10.73 cfs 0.511 of Outflow=10.13 cfs 0.511 of Link AP-1: ANALYSIS POINT 1 Link AP-2: ANALYSIS POINT 2 Link AP-3: ANALYSIS POINT 3 Link AP-4: ANALYSIS POINT 4 Link PROJECT -POST: POST-DEVELOPMENTCONDITION Link PROJECT -PRE: PRE-DEVELOPMENTCONDITION Inflow=25.70 cfs 5.491 of Primary=25.70 cfs 5.491 of Inflow=15.76 cfs 1.008 of Primary=15.76 cfs 1.008 of Inflow=25.10 cfs 10.173 of Primary=25.10 cfs 10.173 of Inflow=10.13 cfs 0.511 of Primary=10.13 cfs 0.511 of Inflow=58.76 cfs 19.004 of Primary=58.76 cfs 19.004 of Inflow=58.91 cfs 10.802 of Primary=58.91 cfs 10.802 of Total Runoff Area = 168.085 ac Runoff Volume = 29.971 of Average Runoff Depth = 2.14" 87.13% Pervious=146.445 ac 12.87% Impervious = 21.640 ac J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 45 Summary for Subcatchment BY-PASS 1: By -Pass 1 Runoff = 2.54 cfs @ 12.06 hrs, Volume= 0.161 at, Depth= 2.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 0.300 55 Woods, Good, HSG B 0.450 75 1/4 acre lots, 38% imp, HSG B * 0.090 85 Road ROW, HSG B 0.840 69 Weighted Average 0.669 79.64% Pervious Area 0.171 20.36% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 87 0.0500 0.12 Sheet Flow, sheet flow Woods: Light underbrush n= 0.400 P2= 3.62" 1.5 247 0.0150 2.79 18.68 Channel Flow, Area-- 6.7 sf Perim= 21.5' r= 0.3 P n= 0.030 Earth. Lyrassed & windine 14.0 334 Total Subcatchment BY-PASS 1: By -Pass 1 Hydrograph 2.54 cfs Type II 24-hr 10-bear I ainf�11=5�46" 2-Runoff-Area=034 ac Runoff Voiume�0.161af Runoff Depth=2�30" o Fi r Length= 34' LL — — ——Tc-114 0 inin 1 CN*69 i 0 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 46 Summary for Subcatchment BY-PASS 2: BY-PASS 2 Runoff = 0.47 cfs @ 12.01 hrs, Volume= 0.025 af, Depth= 1.89" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description * 0.160 64 lots, 10% imp, HSG B 0.144 90.00% Pervious Area 0.016 10.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 145 0.0450 0.27 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" L 0.3- 0.? 0 0.2F U_ 0.2 0.1 F 0.1 <00y; Subcatchment BY-PASS 2: BY-PASS 2 Hydrograph i - -4 I Ijyp� II-z4-Kr- � 11"ear F ainf�11= 4C Runoff Ar-ea=0.1 ac l4unoff Vol%rne�0.025 of Rpnoff Depth=1.09" Flow Len th=145' —SI�pe.0450 T CN=64 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) ❑ Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 47 Summary for Subcatchment BY-PASS 3: BY-PASS 3 Runoff = 7.02 cfs @ 11.96 hrs, Volume= 0.333 af, Depth= 2.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 1.415 75 1/4 acre lots, 38% imp, HSG B 0.877 62.00% Pervious Area 0.538 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.9 101 0.1000 0.35 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" 0.6 224 0.0100 6.16 7.39 Channel Flow, CHANNEL FLOW Area-- 1.2 sf Perim= 3.9' r= 0.3 P n= 0.011 Concrete pipe, straight & clean 5.5 325 Total Subcatchment BY-PASS 3: BY-PASS 3 Hydrograph 7.02 cfs 7 I Type II 214-hr 6 1 1-0-y--ear-Rainfal l=5�46" Ru off Area=1.41 ac 5 f�unoff Volume-0.333 of Runoff Dept h=183" 3 4 FIoLength= 25' ° Tc_5:5 in F3 CN45 2 0 2 0 3 0 4 0 5 0 61 7 0 8I 91 11 1 1 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 48 Summary for Subcatchment BY-PASS 4: BY-PASS 4 Runoff = 1.16 cfs @ 12.27 hrs, Volume= 0.118 af, Depth= 1.97" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 0.350 55 Woods, Good, HSG B 0.370 75 1/4 acre lots, 38% imp, HSG B 0.720 65 Weighted Average 0.579 80.47% Pervious Area 0.141 19.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.5 300 0.0700 0.17 Sheet Flow, sheet flow Woods: Light underbrush n= 0.400 P2= 3.62" 1.0 107 0.1400 1.87 Shallow Concentrated Flow, Shallow Concenetrated Flow Woodland Kv= 5.0 fns 30.5 407 Total Subcatchment BY-PASS 4: BY-PASS 4 Hydrograph 1.16 cfs Type II 24-hr 10-year-Rainfpll=5�46" Runoff Area=0.729 ac Runoff Voiume�0.118 of Runoff Depth=1 �97" 3 Flow Length= I407' ° Tc=30.5 � in VA CW65 10 20 30 40 50 60 70 80 90 100 110 120 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 49 Summary for Subcatchment BY-PASS 5: BY-PASS 5 Runoff = 5.56 cfs @ 12.11 hrs, Volume= 0.411 af, Depth= 1.50" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 2.880 55 Woods, Good, HSG B 0.400 85 1/8 acre lots, 65% imp, HSG B 3.280 59 Weighted Average 3.020 92.07% Pervious Area 0.260 7.93% Impervious Area Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 16.5 123 0.2000 0.12 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 0.2 91 0.0670 8.34 200.22 Channel Flow, cHANNEL fLOW Area-- 24.0 sf Perim-- 29.7' r= 0.8l' n= 0.040 Mountain streams 16.7 N 0 214 Total Subcatchment BY-PASS 5: BY-PASS 5 Hydrograph 1 5.56 cfs 5 3 2 1 0 I Type II 24-hr 110-bear I ainf�11=5j46" Runoff Area=3.289 ac F unoff Volume�0.411 of —Runoff Depth=1 �50" Flo? Length=�4' Tc=16.7 in I CW59 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 50 Summary for Subcatchment BY-PASS 6: BY-PASS 6 Runoff = 2.22 cfs @ 12.06 hrs, Volume= 0.144 af, Depth= 1.43" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 1.210 58 Woods/grass comb., Good, HSG B 1.210 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 50 0.2000 0.10 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.8 225 0.0240 0.77 Shallow Concentrated Flow, SHALLOW CONCENTRATED FLOW Woodland Kv= 5.0 fps 12.8 275 Total Subcatchment BY-PASS 6: BY-PASS 6 Hydrograph If- 2.22 cfs Runoff Type II 24-hr 2 1 10-bear I ainfpll=5�46" Runoff Area=1.21 T ac Runoff Volume=0.144 of Runoff Depth=1 �43" 3 Flov, Lenpth=?75' FL � Tc 12.8 min CN=58 I � 10 20 30 40 50 60 70 80 90 100 110 120 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 51 Summary for Subcatchment BY-PASS 7: BY-PASS 7 Runoff = 11.02 cfs @ 12.58 hrs, Volume= 1.677 af, Depth= 2.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 2.320 55 Woods, Good, HSG B 6.190 72 1/3 acre lots, 30% imp, HSG B * 0.580 85 Road ROW, HSG B 9.090 68 Weighted Average 7.233 79.57% Pervious Area 1.857 20.43% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 53.7 300 0.0625 0.09 Sheet Flow, sheet flow 1.2 280 0.6250 54.9 580 Total 11.02 cfs 11 10 N .. 7 3 6 0 5 r 1 Woods: Dense underbrush n= 0.800 P2= 3.62" 3.95 Shallow Concentrated Flow, SHALLOW CONCENTRATED FLOW Woodland Kv= 5.0 fps Subcatchment BY-PASS 7: BY-PASS 7 Hydrograph ITy_p� II 24-hr 4 10-YOar Rainf011_5.146" (Runoff Area=9 0-9q ac Runoff-lolume=1-.677 of L -i-Ru-no"epih=2.3l" 14owlenith=6-80' —Tc=P4.9 M i n ZN168 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 52 Summary for Subcatchment DA-1: Post -Development DA-1 Runoff = 40.50 cfs @ 12.33 hrs, Volume= 4.521 af, Depth= 2.56" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 5.430 55 Woods, Good, HSG B 10.960 75 1/4 acre lots, 38% imp, HSG B 4.820 85 Gravel roads, HSG B 21.210 72 Weighted Average 17.045 80.36% Pervious Area 4.165 19.64% Impervious Area Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 34.7 174 0.0625 0.08 Sheet Flow, Sheet Flow Woods: Dense underbrush n= 0.800 P2= 3.62" 1.9 700 0.0100 6.03 10.85 Channel Flow, Channel Flow Area-- 1.8 sf Perim= 4.7' r= 0.38' n= 0.013 36.6 874 Total Subcatchment DA-1: Post -Development DA-1 Hydrograph 40.50 cfs 40 Type II 24-hr 35 I 11�Yar F�ainfll=5.I46" 30 --�uno�f a 2121(-ac Runoff-lolume=4-521 of 25 I I R� noff Depih=2.156" o 20 Plowl Lenith=$74' U_ 15 _Tc=�6.6 ffi n 10 1 �N772 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 53 Summary for Subcatchment DA-IA: OFFSITE DA-1A Runoff = 2.77 cfs @ 12.59 hrs, Volume= 0.456 af, Depth= 1.43" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description * 3.830 58 OFFSITE AREA DRAINING TO BMP1 3.830 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 44.5 300 0.1000 0.11 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.7 96 0.0185 0.34 Shallow Concentrated Flow, SHALLOW CONCENTRATED Forest w/Heavy Litter Kv= 2.5 fps 3.2 625 0.0500 3.30 90.66 Channel Flow, CHANNEL FLOW Area-- 27.5 sf Perim-- 110.0' r= 0.25' n= 0.040 Mountain streams 52.4 1,021 Total 3 0 1 2.77 cfs is 1 Subcatchment DA-IA: OFFSITE DA-1A Hydrograph Type II 24-hr 10-bear Rainfpll=5�46" Runoff Area_=3.83QQ ac Runoff Volume0.4 56of Runoff Depth=1 �43" Flow Length=1,P21' Tc=52.4 in CW58 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 54 Summary for Subcatchment DA-2: POST -DEVELOPMENT DA-2 Runoff = 15.54 cfs @ 12.06 hrs, Volume= 0.986 af, Depth= 3.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 0.120 55 Woods, Good, HSG B 2.340 75 1/4 acre lots, 38% imp, HSG B * 1.350 85 Road ROW, HSG B 3.810 78 Weighted Average 2.921 76.66% Pervious Area 0.889 23.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.6 138 0.1250 0.18 Sheet Flow, SHEET FLOW Woods: Light underbrush n= 0.400 P2= 3.62" 1.7 612 0.0100 6.16 7.39 Channel Flow, CHANNEL Area-- 1.2 sf Perim= 3.9' r= 0.3 P n= 0.011 Concrete nine. straiaht & clean 14.3 750 Total Subcatchment DA-2: POST -DEVELOPMENT DA-2 Hydrograph 15.54 cfs ITYP� II 24-hr 14 1 1 110-Yoar Rainfoll=5.146" 12 Runpff Area=�.819 ac 10 Runof�Voltlme=0�86 of _R�noff I Depih=3.11 " 3 0 8 Plowl Lenith=750' U_ - 6 Tc=l4.3 Min 4 1 1 CN1 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 55 Summary for Subcatchment DA-3: POST -DEVELOPMENT DA-3 Runoff = 11.58 cfs @ 12.04 hrs, Volume= 0.671 af, Depth= 2.92" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 0.400 61 >75% Grass cover, Good, HSG B 1.600 75 1/4 acre lots, 38% imp, HSG B * 0.760 85 ROW, HSG B 2.760 76 Weighted Average 2.152 77.97% Pervious Area 0.608 22.03% Impervious Area Tc Length (min) (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 7.2 130 0.0625 0.30 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" 4.4 231 0.0500 0.88 9.67 Channel Flow, Channelized flow Area-- 11.0 sf Perim-- 44.0' r= 0.25' n= 0.150 Sheet flow over Short Grass 11.6 361 Total 1 11.58 cfs 11 1C 7 3 6 0 FL R 1 Subcatchment DA-3: POST -DEVELOPMENT DA-3 Hydrograph �- �— 4Typ� W2"h r 1 _F j (Y-Y4_a_ r Rai-fOP-5.46" Runoff Afea=F.760ac _ Runoff Volume=0.671 of Ru�nof#�Dep h=2.�92" IIowv Len6th=361' -T 1— -TTc=11.6 min L -CN=76 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 56 Summary for Subcatchment DA-4: DA-4 Runoff = 82.04 cfs @ 12.34 hrs, Volume= 9.153 at, Depth= 3.11" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 5.110 55 Woods, Good, HSG B 6.750 75 1/4 acre lots, 38% imp, HSG B * 6.740 85 Road ROW, HSG B * 13.670 85 residential, 65% imp, HSG B * 3.090 75 Commercial, 50% imp, HSG B 35.360 78 Weighted Average 22.364 63.25% Pervious Area 12.995 36.75% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 34.9 248 0.1250 0.12 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 2.5 1,090 0.0415 7.18 330.40 Channel Flow, CHANNEL FLOW Area-- 46.0 sf Perim-- 35.6' r= 1.29' n= 0.050 Mountain streams w/larize boulders 37.4 1,338 Total Subcatchment DA-4: DA-4 Hydrograph • .� • / - • • • OA Runoff Volume=9.15 af • 1 e • • I' I/ • • • li . i ; ❑ Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 57 Summary for Subcatchment DA-5: DA-5 Runoff = 10.73 cfs @ 11.97 hrs, Volume= 0.511 at, Depth= 2.74" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 1.000 61 >75% Grass cover, Good, HSG B * 1.240 85 Road ROW, HSG B 2.240 74 Weighted Average 2.240 100.00% Pervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 5.6 89 0.1400 0.26 Sheet Flow, sheet flow Grass: Dense n= 0.240 P2= 3.62" Subcatchment DA-5: DA-5 Hydrograph 10.73 cfs L -i Ty�e-fl 24-h r 10 - I — 10-y-ear-faiafl U--5�46" 9 8 ff-Area=2.24QQac -R ZVo�mme10-51 kunoaf 7 - — Runo f Deoth=2.T 0 6 Tw Le gth=889' Uo 5 _ Slope-�.1400 / 4 T4=5.6 knin 3 CN-74 2 1 � 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 58 Summary for Subcatchment PRE: PRE -DEVELOPMENT CONDITION Runoff = 58.91 cfs @ 12.74 hrs, Volume= 10.802 af, Depth= 1.58" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 10-Year Rainfall=5.46" Area (ac) CN Description 44.730 55 Woods, Good, HSG B 37.430 67 Brush, Poor, HSG B 82.160 60 Weighted Average 82.160 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 58.7 300 0.0500 0.09 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.0 300 0.0625 1.25 Shallow Concentrated Flow, SHALLOW CONCENTARTED FLOW Woodland Kv= 5.0 fps 0.8 502 0.0500 10.99 104.39 Channel Flow, CHANNEL FLOW Area-- 9.5 sf Perim= 38.0' r= 0.25' n= 0.012 63.5 1,102 Total Subcatchment PRE: PRE -DEVELOPMENT CONDITION Hydrograph r p Runoff 58.91 cfs L J Type # 24-h r 55fl 1-0-Fear-tairvfp l--5�46" 50 45 — Runoff L ea=82-.46 c -Ruftof Vo e=10-.803--af rt Rurnoff Depth--1 �5$" 35 0 30 0 F �ength=1,t02' T-&-6�5 �in 25 20 rt -CN*60 15 10 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 59 Summary for Reach 1R: EX. STREAM Inflow Area = 2.760 ac, 22.03% Impervious, Inflow Depth = 2.70" for 10-Year event Inflow = 11.28 cfs @ 12.06 hrs, Volume= 0.622 of Outflow = 10.30 cfs @ 12.16 hrs, Volume= 0.622 af, Atten= 9%, Lag= 6.4 min Routing by Stor-Ind+Trans method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Max. Velocity= 2.79 fps, Min. Travel Time= 3.9 min Avg. Velocity = 1.08 fps, Avg. Travel Time= 10.0 min Peak Storage= 2,453 cf @ 12.10 hrs Average Depth at Peak Storage= 0.23' Bank -Full Depth= 5.00' Flow Area-- 130.0 sf, Capacity= 2,220.75 cfs 16.00' x 5.00' deep channel, n= 0.040 Mountain streams Side Slope Z-value= 2.0 7' Top Width= 36.00' Length= 650.0' Slope= 0.0415 '/' Inlet Invert= 452.00', Outlet Invert= 425.00' I Reach 1R: EX. STREAM Hydrograph 11.28cfs I 10.30 cfs inflow Area=1766 ac 10 1 1 A�tJ• Flow (Depth=0�23' r T -flax Y-eA=F.79 fps- N g n=0.040 0 6 1 S=01.0415 T 4 1 gapa¢lty=12,229.751Cfs 2 10 20 30 40 50 60 70 80 90 100 110 11 Inflow ❑ Outflow J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam 5 Ci 1 we 5 M. 3 a� a 2 0 1 Reach 1R: EX. STREAM Stage -Discharge 500 1,000 1,500 2,000 Discharge (cfs) Reach 1R: EX. STREAM Stage -Storage 10,00020,00030,000 40,00050,00060,00070,00080,000 Storage (cubic -feet) ❑ Primary ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 61 Summary for Pond SWM/BMP1: SWMBMPI (RETENTION BASIN II) Inflow Area = 25.040 ac, 16.63% Impervious, Inflow Depth = 2.39" for 10-Year event Inflow = 42.54 cfs @ 12.34 hrs, Volume= 4.977 of Outflow = 24.87 cfs @ 12.68 hrs, Volume= 4.971 af, Atten= 42%, Lag= 20.5 min Primary = 24.87 cfs @ 12.68 hrs, Volume= 4.971 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 445.00' Surf.Area= 20,329 sf Storage= 74,248 cf Peak Elev= 447.69' @ 12.68 hrs Surf.Area= 31,237 sf Storage= 146,977 cf (72,730 cf above start) Plug -Flow detention time= 648.4 min calculated for 3.266 of (66% of inflow) Center -of -Mass det. time= 320.7 min ( 1,188.7 - 868.0 ) Volume Invert Avail.Storage Storage Description #1 439.00' 226,253 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 439.00 8,520 0 0 440.00 9,597 9,059 9,059 441.00 10,717 10,157 19,216 442.00 11,899 11,308 30,524 443.00 13,148 12,524 43,047 444.00 14,462 13,805 56,852 445.00 20,329 17,396 74,248 446.00 26,975 23,652 97,900 447.00 29,477 28,226 126,126 448.00 32,039 30,758 156,884 449.00 34,672 33,356 190,239 450.00 37,355 36,014 226,253 Device Routing Invert Outlet Devices #1 Primary 439.00' 42.0" Round Barrel (Culvert) L= 78.9' RCP, sq.cut end projecting, Ke= 0.500 Inlet / Outlet Invert= 439.00' / 434.00' S= 0.0634'/' Cc= 0.900 n= 0.013, Flow Area= 9.62 sf #2 Device 1 445.00' 6.0" Vert. Orifice C= 0.600 #3 Device 1 447.00' 48.0" Horiz. Riser C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=24.80 cfs @ 12.68 hrs HW=447.69' (Free Discharge) L1=Barrel (Culvert) (Passes 24.80 cfs of 122.00 cfs potential flow) E2=Orifice (Orifice Controls 1.48 cfs @ 7.51 fps) 3=Riser (Weir Controls 23.32 cfs @ 2.71 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Hydrograph 3 0 FL 450 449 448 447 a 446 c 445 0 444 443 w 442 441 440 439 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Stage -Discharge Riser - - Orifice Barrel (Culvert) 0 20 40 60 80 100 Discharge (cfs) Inflow ❑ Primary ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam 450 446 444 a� w 442 ►„e Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Stage -Area -Storage Surface/Horizontal[Wetted Area (so-ft) 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 0 50,000 100,000 150,000 200,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 64 Summary for Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Inflow Area = 3.810 ac, 23.34% Impervious, Inflow Depth = 3.11" for 10-Year event Inflow = 15.54 cfs @ 12.06 hrs, Volume= 0.986 of Outflow = 14.99 cfs @ 12.10 hrs, Volume= 0.890 af, Atten= 4%, Lag= 2.0 min Primary = 14.99 cfs @ 12.10 hrs, Volume= 0.890 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 501.54' @ 12.10 hrs Surf.Area= 5,042 sf Storage= 6,772 cf Plug -Flow detention time= 74.5 min calculated for 0.890 of (90% of inflow) Center -of -Mass det. time= 24.7 min ( 852.5 - 827.8 ) Volume Invert Avail.Storage Storage Description #1 500.00' 12,023 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 500.00 3,783 0 0 501.00 4,575 4,179 4,179 502.00 5,441 5,008 9,187 502.50 5,902 2,836 12,023 Device Routing Invert Outlet Devices #1 Primary 501.00' Custom Weir/Orifice, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 10.00 19.00 Primary Outflow Max=14.89 cfs @ 12.10 hrs HW=501.54' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 14.89 cfs @ 2.39 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Hydrograph 1 14.99 cfs 502 Q 2 0 a 501 w 500 0 Inflow lii 1" Ar�a=3-1810l ac— ❑Primary Peak Elev=1501.54' Storage=C,77� cf 1 —1 1 L A 1 —1 1_ L - 1 L 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Stage -Discharge 10 20 30 40 50 Discharge (cfs) 60 70 80 ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam 502 0 501 a� w 500 7 Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (sq-ft) 0 1,000 2,000 3,000 4,000 5,000 Custom Stage Data 5,000 10,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 67 Summary for Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION FILTER) Inflow Area = 2.760 ac, 22.03% Impervious, Inflow Depth = 2.92" for 10-Year event Inflow = 11.58 cfs @ 12.04 hrs, Volume= 0.671 of Outflow = 11.28 cfs @ 12.06 hrs, Volume= 0.622 af, Atten= 3%, Lag= 1.4 min Primary = 11.28 cfs @ 12.06 hrs, Volume= 0.622 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 462.60' @ 12.06 hrs Surf.Area= 2,807 sf Storage= 3,740 cf Plug -Flow detention time= 59.6 min calculated for 0.621 of (93% of inflow) Center -of -Mass det. time=19.8 min ( 850.1 - 830.3 ) Volume Invert Avail.Storage Storage Description #1 461.00' 6,517 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 461.00 1,889 0 0 462.00 2,441 2,165 2,165 463.00 3,050 2,746 4,911 463.50 3,375 1,606 6,517 Device Routing Invert Outlet Devices #1 Primary 462.00' Custom Weir/Orifice, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 5.00 19.00 Primary OutFlow Max=11.11 cfs @ 12.06 hrs HW=462.60' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 11.11 cfs @ 2.40 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pa e�68 Pond SWMBMP3: SWM/BMP3 (BIO-RETENTION FILTER) Hydrograph 1 11.28 cfs 10 8 0 6 u. 0 _ a 462 w _ _ Inflow 1r flov� Area=2I.760I ac ❑ Primary PeWk Eiev=462.60' + Storage=3,740 cf- 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) M Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION FILTER) Stage -Discharge 10 20 30 40 50 60 Discharge (cfs) ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam 463 0 462 a� w 461 Pond SWMBMP3: SWM/BMP3 (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (so-ft) 0 500 1,000 1,500 2,000 2,500 3,000 0 2,000 4,000 6,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 70 Summary for Pond SWM/BMP4: SWMBMP4 (RETENTION BASIN II) Inflow Area = 38.120 ac, 35.69% Impervious, Inflow Depth = 3.08" for 10-Year event Inflow = 87.63 cfs @ 12.31 hrs, Volume= 9.775 of Outflow = 24.44 cfs @ 13.00 hrs, Volume= 9.762 af, Atten= 72%, Lag= 41.1 min Primary = 22.24 cfs @ 13.00 hrs, Volume= 9.701 of Secondary = 2.20 cfs @ 13.00 hrs, Volume= 0.062 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 430.00' Surf.Area= 31,380 sf Storage= 161,961 cf Peak Elev= 435.61' @ 13.00 hrs Surf.Area= 40,691 sf Storage= 363,964 cf (202,003 cf above start) Plug -Flow detention time= 753.0 min calculated for 6.042 of (62% of inflow) Center -of -Mass det. time= 383.9 min ( 1,233.9 - 850.0 ) Volume Invert Avail.Storage Storage Description #1 422.00' 443,792 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 422.00 14,564 0 0 423.00 15,872 15,218 15,218 424.00 17,203 16,538 31,756 425.00 18,559 17,881 49,637 426.00 19,941 19,250 68,887 427.00 21,343 20,642 89,529 428.00 22,774 22,059 111,587 429.00 23,297 23,036 134,623 430.00 31,380 27,339 161,961 431.00 32,994 32,187 194,148 432.00 34,626 33,810 227,958 433.00 36,279 35,453 263,411 434.00 37,951 37,115 300,526 435.00 39,643 38,797 339,323 436.00 41,352 40,498 379,820 437.00 43,090 42,221 422,041 437.50 43,914 21,751 443,792 Device Routing Invert Outlet Devices #1 Primary 422.00' 42.0" Round Barrell (Culvert) L= 120.5' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 422.00' / 418.00' S= 0.0332 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area-- 9.62 sf #2 Device 1 430.00' 8.0" Vert. Circle Orifice - 2 YR Storm Controlling Structure C= 0.600 #3 Device 1 433.50' 24.0" W x 18.0" H Vert. Square Orifice -10 YR Storm Controlling Structure C= 0.600 #4 Device 1 435.50' 48.0" Horiz. Riser C= 0.600 Limited to weir flow at low heads #5 Secondary 435.50' Emergency Spillway, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 15.00 27.00 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 71 Primary OutFlow Max=22.07 cfs @ 13.00 hrs HW=435.61' (Free Discharge) L=Barrell (Culvert) (Passes 22.07 cfs of 159.56 cfs potential flow) 2=Circle Orifice - 2 YR Storm Controlling Structure(Orifice Controls 3.86 cfs @ 11.06 fps) 3=Square Orifice -10 YR Storm Controlling Structure(Orifice Controls 16.64 cfs @ 5.55 fps) =Riser (Weir Controls 1.56 cfs @ 1.10 fps) Secondary OutFlow Max=1.96 cfs @ 13.00 hrs HW=435.61' (Free Discharge) T 5=Emergency Spillway (Weir Controls 1.96 cfs @ 1.12 fps) Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) 87.63 cfs I 90 80 70 X 1 4 60 3 50 4 22.24 cfs 3 Hydrograph I1I_ El Inflow InflQI0v Ar�a7-:3$.1120 -ac Outflow Peak levl-I��435rr61' ❑ Primary + Storag: 363,964 cf C Secondary T T T T 1 1 I l l l l i t —I 00000000 .0 70 :0 90 100 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT1_1ST SUBMITTAL Type I124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Paae 72 Mil ig15l 432 0 430 a 428 w 426 424 422 L 0 436 434 a� 2 432 c 430 428 w 426 424 422 0 Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) Stage -Discharge ❑ Total ❑ Primary Emergency Spillway - - ❑ Secondary _ Square Orifice - 10 YR Storm Controlling Structure Circle Orifice - 2 YR Storm Controlling Structure Barrell (Culvert) 50 100 150 200 250 Discharge (cfs) Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) Stage -Area -Storage Surface/Horizontal/Wetted Area (sq-ft) 0 10,000 20,000 30,000 40,000 100,000 200,000 300,000 400,000 Storage (cubic -feet) 0 Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 73 Summary for Pond SWM/BMP5: SWM/BMP5 (BIO-RETENTION FILTER) Inflow Area = 2.240 ac, 0.00% Impervious, Inflow Depth = 2.74" for 10-Year event Inflow = 10.73 cfs @ 11.97 hrs, Volume= 0.511 of Outflow = 10.13 cfs @ 12.00 hrs, Volume= 0.511 af, Atten= 6%, Lag= 1.8 min Primary = 10.13 cfs @ 12.00 hrs, Volume= 0.511 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 438.25' Surf.Area= 2,733 sf Storage= 2,367 cf Peak Elev= 438.85' @ 12.00 hrs Surf.Area= 3,193 sf Storage= 4,140 cf (1,774 cf above start) Plug -Flow detention time= 79.5 min calculated for 0.456 of (89% of inflow) Center -of -Mass det. time= 7.4 min ( 837.1 - 829.6 ) Volume Invert Avail.Storage Storage Description #1 437.25' 8,361 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 437.25 2,012 0 0 438.00 2,541 1,707 1,707 439.00 3,309 2,925 4,632 440.00 4,149 3,729 8,361 Device Routing Invert Outlet Devices #1 Primary 438.25' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 1.50 Width (feet) 5.00 15.50 Primary Outflow Max=10.01 cfs @ 12.00 hrs HW=438.84' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 10.01 cfs @ 2.38 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT1_1ST SUBMITTAL Type I124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Paae 74 Pond SWM/BMP5: SWM/BMP5 (BIO-RETENTION FILTER) Hydrograph N C) 3 0 E „N 439 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP5: SWM/BMP5 (BIO-RETENTION FILTER) Stage -Discharge Custom Weir/Orifice 0 10 20 30 40 50 60 Discharge (cfs) ❑ Inflow ❑ Primary ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam ..R a� 439 0 m w 438 Pond SWMBMPS: SWM/BMPS (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (sq-ft) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 0 2,000 4,000 6,000 8,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 76 Summary for Link AP-1: ANALYSIS POINT 1 Inflow Area = 27.455 ac, 17.81% Impervious, Inflow Depth = 2.40" for 10-Year event Inflow = 25.70 cfs @ 12.68 hrs, Volume= 5.491 of Primary = 25.70 cfs @ 12.68 hrs, Volume= 5.491 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Link AP-1: ANALYSIS POINT 1 Hydrograph 25.70 V/VI Ir�iflov� Are6=21i.--456- ac 25 VVI 20 -1 T I F 7 15 3 I L -L _o " 10 5 i 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 77 Summary for Link AP-2: ANALYSIS POINT 2 Inflow Area = 4.530 ac, 22.73% Impervious, Inflow Depth = 2.67" for 10-Year event Inflow = 15.76 cfs @ 12.10 hrs, Volume= 1.008 of Primary = 15.76 cfs @ 12.10 hrs, Volume= 1.008 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs ENUOTOM r1:9®-w� 1 1 � 1 0 FL 0 Link AP-2: ANALYSIS POINT 2 Hydrograph 1 1 Inflow 1r fiov� Aria=41.5301 ac 0 Primary i I L I —1 1 L 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 78 Summary for Link AP-3: ANALYSIS POINT 3 Inflow Area = 41.400 ac, 33.49% Impervious, Inflow Depth > 2.95" for 10-Year event Inflow = 25.10 cfs @ 12.99 hrs, Volume= 10.173 of Primary = 25.10 cfs @ 12.99 hrs, Volume= 10.173 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link AP-3: ANALYSIS POINT 3 Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 79 Summary for Link AP-4: ANALYSIS POINT 4 Inflow Area = 2.240 ac, 0.00% Impervious, Inflow Depth = 2.74" for 10-Year event Inflow = 10.13 cfs @ 12.00 hrs, Volume= 0.511 of Primary = 10.13 cfs @ 12.00 hrs, Volume= 0.511 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link AP-4: ANALYSIS POINT 4 Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 80 Summary for Link PROJECT -POST: POST -DEVELOPMENT CONDITION Inflow Area = 85.925 ac, 25.18% Impervious, Inflow Depth = 2.65" for 10-Year event Inflow = 58.76 cfs @ 12.70 hrs, Volume= 19.004 of Primary = 58.76 cfs @ 12.70 hrs, Volume= 19.004 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link PROJECT -POST: POST -DEVELOPMENT CONDITION Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 10-Year Rainfall=5.46" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 81 Summary for Link PROJECT -PRE: PRE -DEVELOPMENT CONDITION Inflow Area = 82.160 ac, 0.00% Impervious, Inflow Depth = 1.58" for 10-Year event Inflow = 58.91 cfs @ 12.74 hrs, Volume= 10.802 of Primary = 58.91 cfs @ 12.74 hrs, Volume= 10.802 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link PROJECT -PRE: PRE -DEVELOPMENT CONDITION Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 82 Time span=5.00-120.00 hrs, dt=0.05 hrs, 2301 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment BY-PASS 1: By -Pass 1 Runoff Area=0.840 ac 20.36% Impervious Runoff Depth=5.17" Flow Length=334' Tc=14.0 min CN=69 Runoff=5.75 cfs 0.362 of Subcatchment BY-PASS 2: BY-PASS 2 Runoff Area=0.160 ac 10.00% Impervious Runoff Depth=4.55" Flow Length=145' Slope=0.0450'/' Tc=9.0 min CN=64 Runoff=1.15 cfs 0.061 of SubcatchmentBY-PASS 3: BY-PASS 3 Runoff Area=1.415 ac 38.00% Impervious Runoff Depth=5.91" Flow Length=325' Tc=5.5 min CN=75 Runoff=14.31 cfs 0.696 of SubcatchmentBY-PASS 4: BY-PASS 4 Runoff Area=0.720 ac 19.53% Impervious Runoff Depth=4.68" Flow Length=407' Tc=30.5 min CN=65 Runoff=2.88 cfs 0.281 of Subcatchment BY-PASS 5: BY-PASS 5 Runoff Area=3.280 ac 7.93% Impervious Runoff Depth=3.94" Flow Length=214' Tc=16.7 min CN=59 Runoff=15.65 cfs 1.077 of SubcatchmentBY-PASS 6: BY-PASS 6 Runoff Area=1.210 ac 0.00% Impervious Runoff Depth=3.82" Flow Length=275' Tc=12.8 min CN=58 Runoff=6.36 cfs 0.385 of Subcatchment BY-PASS 7: BY-PASS 7 Runoff Area=9.090 ac 20.43% Impervious Runoff Depth=5.04" Flow Length=580' Tc=54.9 min CN=68 Runoff=26.06 cfs 3.821 of SubcatchmentDA-1: Post-DevelopmentDA-1 Runoff Area=21.210 ac 19.64% Impervious Runoff Depth=5.54" Flow Length=874' Tc=36.6 min CN=72 Runoff=89.14 cfs 9.787 of SubcatchmentDA-IA: OFFSITE DA-IA Runoff Area=3.830 ac 0.00% Impervious Runoff Depth=3.82" Flow Length=1,021' Tc=52.4 min CN=58 Runoff=8.36 cfs 1.218 of SubcatchmentDA-2: POST-DEVELOPMENTDA-2 Runoff Area=3.810 ac 23.34% Impervious Runoff Depth=6.28" Flow Length=750' Tc=14.3 min CN=78 Runoff=30.80 cfs 1.992 of SubcatchmentDA-3: POST-DEVELOPMENTDA-3 Runoff Area=2.760 ac 22.03% Impervious Runoff Depth=6.03" Flow Length=361' Tc=11.6 min CN=76 Runoff=23.44 cfs 1.387 of SubcatchmentDA-4: DA-4 Runoff Area=35.360 ac 36.75% Impervious Runoff Depth=6.28" Flow Length=1,338' Tc=37.4 min CN=78 Runoff=164.92 cfs 18.491 of SubcatchmentDA-5: DA-5 Runoff Area=2.240 ac 0.00% Impervious Runoff Depth=5.78" Flow Length=89' Slope=0.1400 '/' Tc=5.6 min CN=74 Runoff=22.16 cfs 1.080 of SubcatchmentPRE: PRE -DEVELOPMENT Runoff Area=82.160 ac 0.00% Impervious Runoff Depth=4.06" Flow Length=1,102' Tc=63.5 min CN=60 Runoff=167.04 cfs 27.809 of Reach 1R: EX. STREAM Avg. Flow Depth=0.36' Max Vet=3.67 fps Inflow=23.16 cfs 1.337 of n=0.040 L=650.0' S=0.0415 '/' Capacity=2,220.75 cfs Outflow=22.09 cfs 1.337 of Pond SWM/BMPI: SWMBMP1(RETENTION Peak Elev=448.65' Storage=178,220 cf Inflow=95.60 cfs 11.005 of Outflow=79.43 cfs 10.999 of J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 83 Pond SWM/BMP2: SWMIBMP 2 (BIO-RETENTIONPeak Elev=501.83' Storage=8,249 cf Inflow=30.80 cfs 1.992 of Outflow=30.07 cfs 1.896 of Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION Peak Elev=462.88' Storage=4,564 cf Inflow=23.44 cfs 1.387 of Outflow=23.16 cfs 1.337 of Pond SWM/BMP4: SWMBMP4 (RETENTION Peak Elev=436.66' Storage=407,645 cf Inflow=174.18 cfs 19.828 of Primary=78.24 cfs 16.239 of Secondary=78.96 cfs 3.576 of Outflow=157.19 cfs 19.815 of Pond SWM/BMP5: SWMIBMP5 (BIO-RETENTION Peak Elev=439.16' Storage=5,173 cf Inflow=22.16 cfs 1.080 of Outflow=21.43 cfs 1.080 of Link AP-1: ANALYSIS POINT 1 Link AP-2: ANALYSIS POINT 2 Link AP-3: ANALYSIS POINT 3 Link AP-4: ANALYSIS POINT 4 Link PROJECT -POST: POST-DEVELOPMENTCONDITION Link PROJECT -PRE: PRE-DEVELOPMENTCONDITION Inflow=81.62 cfs 12.118 of Primary=81.62 cfs 12.118 of Inflow=32.07 cfs 2.177 of Primary=32.07 cfs 2.177 of Inflow=161.25 cfs 20.892 of Primary=161.25 cfs 20.892 of Inflow=21.43 cfs 1.080 of Primary=21.43 cfs 1.080 of Inflow=278.94 cfs 40.473 of Primary=278.94 cfs 40.473 of Inflow=167.04 cfs 27.809 of Primary=167.04 cfs 27.809 of Total Runoff Area = 168.085 ac Runoff Volume = 68.446 of Average Runoff Depth = 4.89" 87.13% Pervious=146.445 ac 12.87% Impervious = 21.640 ac J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pa eg_84 Summary for Subcatchment BY-PASS 1: By -Pass 1 Runoff = 5.75 cfs @ 12.06 hrs, Volume= 0.362 at, Depth= 5.17" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 0.300 55 Woods, Good, HSG B 0.450 75 1/4 acre lots, 38% imp, HSG B * 0.090 85 Road ROW, HSG B 0.840 69 Weighted Average 0.669 79.64% Pervious Area 0.171 20.36% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.5 87 0.0500 0.12 Sheet Flow, sheet flow Woods: Light underbrush n= 0.400 P2= 3.62" 1.5 247 0.0150 2.79 18.68 Channel Flow, Area-- 6.7 sf Perim= 21.5' r= 0.3 P n= 0.030 Earth. Lyrassed & windine 14.0 334 Total Subcatchment BY-PASS 1: By -Pass 1 Hydrograph 5.75 cfs Type II 24-hr 5 T 1100-year Rainfplt-8�95" Runoff 4- �Area=0.84 ac unoif-Voi me�0:361af 4—Runoff Depth=5�17" 3 f1ow Len�gti=' 3 0 I- iL Tc=14.0 imin 2 T 1 MEN 1 � -------------------- 1 20 30 40 50 60 70 80 90 100 110 120 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 85 Summary for Subcatchment BY-PASS 2: BY-PASS 2 Runoff = 1.15 cfs @ 12.01 hrs, Volume= 0.061 af, Depth= 4.55" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description * 0.160 64 lots, 10% imp, HSG B 0.144 90.00% Pervious Area 0.016 10.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 145 0.0450 0.27 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" 3 0 FL 11.15cfs I 1 Subcatchment BY-PASS 2: BY-PASS 2 Hydrograph I Type II 24-hr - 1100-year-�ai-nfpl 8�95" Ru off Area=0.16 ac l4uno f Vol, umel0.06 of Runoff Depl h=4�55" Flog Len th- 45' Slope=0.04 0 T Tc*9.0 in i n CN764 1 ii1.i - 1 ...iiiiiiiiiiiiiiiiiiiii1 1 .. i...... 1 20 30 40 50 60 70 :1 91 100 110 120 ❑ Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 86 Summary for Subcatchment BY-PASS 3: BY-PASS 3 Runoff = 14.31 cfs @ 11.96 hrs, Volume= 0.696 af, Depth= 5.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 1.415 75 1/4 acre lots, 38% imp, HSG B 0.877 62.00% Pervious Area 0.538 38.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.9 101 0.1000 0.35 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" 0.6 224 0.0100 6.16 7.39 Channel Flow, CHANNEL FLOW Area-- 1.2 sf Perim= 3.9' r= 0.3 P n= 0.011 Concrete pipe, straight & clean 5.5 325 Total Subcatchment BY-PASS 3: BY-PASS 3 Hydrograph 14.31 cfs 14 t — — rt — t- rtTYp� II 24--hr 12 + — — -100-YOar RainfAlt=-8.95" IRunff Area=1.415ac N 10 I— Runoff Volume=0.696 of rtt�o"epih=5.91" 8 o L L -i i lbwlen6tk_=�25' 6 Tc:75.5 Arlin 4 CN= 75 -- .0 70 80 90 100 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 87 Summary for Subcatchment BY-PASS 4: BY-PASS 4 Runoff = 2.88 cfs @ 12.25 hrs, Volume= 0.281 af, Depth= 4.68" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 0.350 55 Woods, Good, HSG B 0.370 75 1/4 acre lots, 38% imp, HSG B 0.720 65 Weighted Average 0.579 80.47% Pervious Area 0.141 19.53% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 29.5 300 0.0700 0.17 Sheet Flow, sheet flow Woods: Light underbrush n= 0.400 P2= 3.62" 1.0 107 0.1400 1.87 Shallow Concentrated Flow, Shallow Concenetrated Flow Woodland Kv= 5.0 fns 30.5 407 Total 1 2.88 cfs 2 N 3 0 FL Subcatchment BY-PASS 4: BY-PASS 4 Hydrograph Type II 24-hr 100-Year Rainfpll=8�95" Runoff �Area=0.729 ac unoff vol'ume�0 28 of Runoff Depth=4�68" Flow Length= I407' Tc=30.5 � i n 1 CN45 - - 1 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 88 Summary for Subcatchment BY-PASS 5: BY-PASS 5 Runoff = 15.65 cfs @ 12.10 hrs, Volume= 1.077 af, Depth= 3.94" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 2.880 55 Woods, Good, HSG B 0.400 85 1/8 acre lots, 65% imp, HSG B 3.280 59 Weighted Average 3.020 92.07% Pervious Area 0.260 7.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.5 123 0.2000 0.12 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 0.2 91 0.0670 8.34 200.22 Channel Flow, cHANNEL fLOW Area-- 24.0 sf Perim-- 29.7' r= 0.8l' n= 0.040 Mountain streams 16.7 214 Total 1 15.65 cfs 1 i Subcatchment BY-PASS 5: BY-PASS 5 Hydrograph ITyp� II 24-hr 1 Q0-YOar Rainfall=8.I95" lunOff Aea= 28q ac Runoff-/Olume=1-.077-af _R noff Depih=3.�W' Plowl Len jth=�14' Tc=l 6.7 Inin -CN-59 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 89 Summary for Subcatchment BY-PASS 6: BY-PASS 6 Runoff = 6.36 cfs @ 12.05 hrs, Volume= 0.385 af, Depth= 3.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 1.210 58 Woods/grass comb., Good, HSG B 1.210 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 50 0.2000 0.10 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.8 225 0.0240 0.77 Shallow Concentrated Flow, SHALLOW CONCENTRATED FLOW Woodland Kv= 5.0 fps 12.8 275 Total Subcatchment BY-PASS 6: BY-PASS 6 Hydrograph 6.36 cfs t 0 Runoff - - Type II 24-hr 6 1100-year �ainfpll=8195" 5 - -Ru off -A 4:1 ac 4 _ f.21 uno Vollume 0.38 of Runoff Depth=3�82" 3 Bovy Len�gtJ =- n' ° 3 Tc=12.8 min -I CN�=58 2 1 0 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 (0 2014 HydroCAD Software Solutions LLC Page 90 Summary for Subcatchment BY-PASS 7: BY-PASS 7 Runoff = 26.06 cfs @ 12.56 hrs, Volume= 3.821 af, Depth= 5.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 2.320 55 Woods, Good, HSG B 6.190 72 1/3 acre lots, 30% imp, HSG B * 0.580 85 Road ROW, HSG B 9.090 68 Weighted Average 7.233 79.57% Pervious Area 1.857 20.43% Impervious Area Tc min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 53.7 300 0.0625 0.09 Sheet Flow, sheet flow Woods: Dense underbrush n= 0.800 P2= 3.62" 1.2 280 0.6250 3.95 Shallow Concentrated Flow, SHALLOW CONCENTRATED FLOW Woodland Kv= 5.0 fns 54.9 580 Total Subcatchment BY-PASS 7: BY-PASS 7 Hydrograph IT- 26.06 cfs 0 Runoff 25 Type II 24-hr 100-YOar Rainfall=8.05" 20 Runoff Aea=? Mq ac Runoff Volume=3.821 of 3 15 R�_noff�1Depih=5.04_ " _o Plowl Lenith=$80' 10 Tc=�4.9 In! n 5 CN=68 rl 10 20 30 40 50 60 70 80 90 100 110 120 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 91 Summary for Subcatchment DA-1: Post -Development DA-1 Runoff = 89.14 cfs @ 12.32 hrs, Volume= 9.787 af, Depth= 5.54" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 5.430 55 Woods, Good, HSG B 10.960 75 1/4 acre lots, 38% imp, HSG B 4.820 85 Gravel roads, HSG B 21.210 72 Weighted Average 17.045 80.36% Pervious Area 4.165 19.64% Impervious Area Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 34.7 174 0.0625 0.08 Sheet Flow, Sheet Flow Woods: Dense underbrush n= 0.800 P2= 3.62" 1.9 700 0.0100 6.03 10.85 Channel Flow, Channel Flow Area-- 1.8 sf Perim= 4.7' r= 0.38' n= 0.013 36.6 874 Total 1 89.14 cfs n 6 3 5 0 a: 4 3 2 1 Subcatchment DA-1: Post -Development DA-1 Hydrograph ITyp� II 24-hr 100-YOar Rainfall=8.I95" L 1 L runoff Ar7a=21'21(_ac Runoff Volume=9.787 of —R�—no"epih=5.�4" Howleln jth-674' -tTc—q" "n T_ _T I -CN �72 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 92 Summary for Subcatchment DA-IA: OFFSITE DA-1A Runoff = 8.36 cfs @ 12.54 hrs, Volume= 1.218 af, Depth= 3.82" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description * 3.830 58 OFFSITE AREA DRAINING TO BMP1 3.830 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 44.5 300 0.1000 0.11 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.7 96 0.0185 0.34 Shallow Concentrated Flow, SHALLOW CONCENTRATED Forest w/Heavy Litter Kv= 2.5 fps 3.2 625 0.0500 3.30 90.66 Channel Flow, CHANNEL FLOW Area-- 27.5 sf Perim-- 110.0' r= 0.25' n= 0.040 Mountain streams 52.4 1,021 Total Subcatchment DA-IA: OFFSITE DA-1A Hydrograph 8.36 cfs 8 +Ty-p6 tt-2"hr 10 0 -Year -Ra i nfp l [-8 � 95" 7 Runoff Area=3.839 ac ^, 6 - Runoff Volume�1.218 of 5 fi 1 RunoTDep�ft-3�82" 3 _ —Flow eng1h=-1 U. 4- Tc=52.4 in 3 1 CW58 2 1 0 . 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 93 Summary for Subcatchment DA-2: POST -DEVELOPMENT DA-2 Runoff = 30.80 cfs @ 12.06 hrs, Volume= 1.992 af, Depth= 6.28" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 0.120 55 Woods, Good, HSG B 2.340 75 1/4 acre lots, 38% imp, HSG B * 1.350 85 Road ROW, HSG B 3.810 78 Weighted Average 2.921 76.66% Pervious Area 0.889 23.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.6 138 0.1250 0.18 Sheet Flow, SHEET FLOW Woods: Light underbrush n= 0.400 P2= 3.62" 1.7 612 0.0100 6.16 7.39 Channel Flow, CHANNEL Area-- 1.2 sf Perim= 3.9' r= 0.3 P n= 0.011 Concrete nine. straiaht & clean 14.3 750 Total Subcatchment DA-2: POST -DEVELOPMENT DA-2 Hydrograph 30.80 cfs 30 t__ -tTyp� II 24--hr -1Q�YOar R�ainfalL=8.25" 25 Run?ff Area=�.819 ac 20 Runoff-Volume=1-192-af R�noff Depih=6.�8" 0 15 Plowl Len6th=150' -+Tc=14.3 Tin 10 CN= 78 i 5 1 i; ��.iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii 10 20 30 40 50 60 70 80 90 100 110 120 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 94 Summary for Subcatchment DA-3: POST -DEVELOPMENT DA-3 Runoff = 23.44 cfs @ 12.03 hrs, Volume= 1.387 af, Depth= 6.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 0.400 61 >75% Grass cover, Good, HSG B 1.600 75 1/4 acre lots, 38% imp, HSG B * 0.760 85 ROW, HSG B 2.760 76 Weighted Average 2.152 77.97% Pervious Area 0.608 22.03% Impervious Area Tc Length (min) (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 7.2 130 0.0625 0.30 Sheet Flow, SHEET FLOW Grass: Short n= 0.150 P2= 3.62" 4.4 231 0.0500 0.88 9.67 Channel Flow, Channelized flow Area-- 11.0 sf Perim-- 44.0' r= 0.25' n= 0.150 Sheet flow over Short Grass 11.6 361 Total 1 23.44 cfs oil n u. 1 Subcatchment DA-3: POST -DEVELOPMENT DA-3 Hydrograph I I L Type II 24-hr — I — r- -T -100---YOar Rainfall=8.95" no f lea=? T6q ac Runoff Volume=1.387 of rt �u�noff_�'Depih=6.63" kowlenith=361' r- -Tc=I1-. 6 on L _L I �NL6 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 95 Summary for Subcatchment DA-4: DA-4 Runoff = 164.92 cfs @ 12.33 hrs, Volume= 18.491 at, Depth= 6.28" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 5.110 55 Woods, Good, HSG B 6.750 75 1/4 acre lots, 38% imp, HSG B * 6.740 85 Road ROW, HSG B * 13.670 85 residential, 65% imp, HSG B * 3.090 75 Commercial, 50% imp, HSG B 35.360 78 Weighted Average 22.364 63.25% Pervious Area 12.995 36.75% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 34.9 248 0.1250 0.12 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 2.5 1,090 0.0415 7.18 330.40 Channel Flow, CHANNEL FLOW Area-- 46.0 sf Perim-- 35.6' r= 1.29' n= 0.050 Mountain streams w/larize boulders 37.4 1,338 Total Subcatchment DA-4: DA-4 Hydrograph ❑ Runoff P VA I tlypte 11 24--hr— Ru= Area=35.369 ac 49 af 11 1 I . . r: • •1 1� 1 iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii 1 1 1 1 1 .1 1 :1 •1 11 1 1 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 (0 2014 HydroCAD Software Solutions LLC Page 96 Summary for Subcatchment DA-5: DA-5 Runoff = 22.16 cfs @ 11.96 hrs, Volume= 1.080 at, Depth= 5.78" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 1.000 61 >75% Grass cover, Good, HSG B * 1.240 85 Road ROW, HSG B 2.240 74 Weighted Average 2.240 100.00% Pervious Area Tc Length Slope Velocity Capacity Description min) (feet) (ft/ft) (ft/sec) (cfs) 5.6 89 0.1400 0.26 Sheet Flow, sheet flow Grass: Dense n= 0.240 P2= 3.62" Subcatchment DA-5: DA-5 Hydrograph 22.16cfs 22 _ - - Type 112�hr 20 1100- (year n11=8�95" 18 Ru off Area=2.249 ac 16 unoffVo�ume�1.086 of 4 14 Runaff Depfth=5 j8" 0 12 �Fl�w Lepgth=, 89, 10 Slope=0.1400 / 8 Tc1=5.6 �nin 6 , CN-74 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 97 Summary for Subcatchment PRE: PRE -DEVELOPMENT CONDITION Runoff = 167.04 cfs @ 12.68 hrs, Volume= 27.809 af, Depth= 4.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Year Rainfall=8.95" Area (ac) CN Description 44.730 55 Woods, Good, HSG B 37.430 67 Brush, Poor, HSG B 82.160 60 Weighted Average 82.160 100.00% Pervious Area Tc (min) Length (feet) Slope (ft/ft) Velocity (ft/sec) Capacity Description (cfs) 58.7 300 0.0500 0.09 Sheet Flow, SHEET FLOW Woods: Dense underbrush n= 0.800 P2= 3.62" 4.0 300 0.0625 1.25 Shallow Concentrated Flow, SHALLOW CONCENTARTED FLOW Woodland Kv= 5.0 fps 0.8 502 0.0500 10.99 104.39 Channel Flow, CHANNEL FLOW Area-- 9.5 sf Perim= 38.0' r= 0.25' n= 0.012 63.5 1,102 Total 140 ^. 120 100 3 0 80 FL 60 40 20 0 Subcatchment PRE: PRE -DEVELOPMENT CONDITION Hydrograph Type II 24-- r - I -�- -100-1 ear "infpll=8.j95" Rungpff Area=82.160 ac t I-unofflvolu�e�7.806_of I r -1 -R1 wof -Dept h=4.106" -loam Length -tJ 2' Tc=63.5 inin CN060 i 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 0 Runoff J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 98 Summary for Reach 1R: EX. STREAM Inflow Area = 2.760 ac, 22.03% Impervious, Inflow Depth = 5.81" for 100-Year event Inflow = 23.16 cfs @ 12.05 hrs, Volume= 1.337 of Outflow = 22.09 cfs @ 12.13 hrs, Volume= 1.337 af, Atten= 5%, Lag= 4.9 min Routing by Stor-Ind+Trans method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Max. Velocity= 3.67 fps, Min. Travel Time= 2.9 min Avg. Velocity = 1.14 fps, Avg. Travel Time= 9.5 min Peak Storage= 3,896 cf @ 12.08 hrs Average Depth at Peak Storage= 0.36' Bank -Full Depth= 5.00' Flow Area-- 130.0 sf, Capacity= 2,220.75 cfs 16.00' x 5.00' deep channel, n= 0.040 Mountain streams Side Slope Z-value= 2.0 7' Top Width= 36.00' Length= 650.0' Slope= 0.0415 '/' Inlet Invert= 452.00', Outlet Invert= 425.00' I Reach 1R: EX. STREAM Hydrograph 1• .i ac ii -. i-0 i0 r- qapa�lty=2,220-75 cfs --------------- Inflow ❑ Outflow J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam 5 Ci 1 we 5 M. 3 a� a 2 0 1 Reach 1R: EX. STREAM Stage -Discharge 500 1,000 1,500 2,000 Discharge (cfs) Reach 1R: EX. STREAM Stage -Storage 10,00020,00030,000 40,00050,00060,00070,00080,000 Storage (cubic -feet) ❑ Primary ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 100 Summary for Pond SWM/BMP1: SWMBMPI (RETENTION BASIN II) Inflow Area = 25.040 ac, 16.63% Impervious, Inflow Depth = 5.27" for 100-Year event Inflow = 95.60 cfs @ 12.33 hrs, Volume= 11.005 of Outflow = 79.43 cfs @ 12.51 hrs, Volume= 10.999 af, Atten= 17%, Lag= 10.7 min Primary = 79.43 cfs @ 12.51 hrs, Volume= 10.999 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 445.00' Surf.Area= 20,329 sf Storage= 74,248 cf Peak Elev= 448.65' @ 12.51 hrs Surf.Area= 33,747 sf Storage= 178,220 cf (103,973 cf above start) Plug -Flow detention time= 282.1 min calculated for 9.295 of (84% of inflow) Center -of -Mass det. time=161.1 min ( 1,007.1 - 845.9 ) Volume Invert Avail.Storage Storage Description #1 439.00' 226,253 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 439.00 8,520 0 0 440.00 9,597 9,059 9,059 441.00 10,717 10,157 19,216 442.00 11,899 11,308 30,524 443.00 13,148 12,524 43,047 444.00 14,462 13,805 56,852 445.00 20,329 17,396 74,248 446.00 26,975 23,652 97,900 447.00 29,477 28,226 126,126 448.00 32,039 30,758 156,884 449.00 34,672 33,356 190,239 450.00 37,355 36,014 226,253 Device Routing Invert Outlet Devices #1 Primary 439.00' 42.0" Round Barrel (Culvert) L= 78.9' RCP, sq.cut end projecting, Ke= 0.500 Inlet / Outlet Invert= 439.00' / 434.00' S= 0.0634'/' Cc= 0.900 n= 0.013, Flow Area= 9.62 sf #2 Device 1 445.00' 6.0" Vert. Orifice C= 0.600 #3 Device 1 447.00' 48.0" Horiz. Riser C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=79.36 cfs @ 12.51 hrs HW=448.65' (Free Discharge) L1=Barrel (Culvert) (Passes 79.36 cfs of 130.17 cfs potential flow) E2=Orifice (Orifice Controls 1.74 cfs @ 8.87 fps) 3=Riser (Orifice Controls 77.62 cfs @ 6.18 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type I124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 101 Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Hydrograph 95.60 cfs _ _ Inflow 100 Ind ovv�Are�--25.046-ac ❑ Primary 79.43 cfs t- Pok-�Iev�448."' 80 IStrn-agrll7 ,22"f 70 0 60 0 50 L FL 40 30 20 10 0 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) 450 449 448 447 a 446 c 445 0 444 443 w 442 441 440 439 Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Stage -Discharge Riser - - Orifice Barrel (Culvert) 0 20 40 60 80 100 Discharge (cfs) ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 102 450 446 444 a� w 442 ►„e Pond SWM/BMP1: SWM/BMP1 (RETENTION BASIN II) Stage -Area -Storage Surface/Horizontal[Wetted Area (so-ft) 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 0 50,000 100,000 150,000 200,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pale 103 Summary for Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Inflow Area = 3.810 ac, 23.34% Impervious, Inflow Depth = 6.28" for 100-Year event Inflow = 30.80 cfs @ 12.06 hrs, Volume= 1.992 of Outflow = 30.07 cfs @ 12.09 hrs, Volume= 1.896 af, Atten= 2%, Lag= 1.6 min Primary = 30.07 cfs @ 12.09 hrs, Volume= 1.896 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 501.83' @ 12.08 hrs Surf.Area= 5,290 sf Storage= 8,249 cf Plug -Flow detention time= 46.8 min calculated for 1.896 of (95% of inflow) Center -of -Mass det. time=18.9 min ( 826.7 - 807.8 ) Volume Invert Avail.Storage Storage Description #1 500.00' 12,023 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 500.00 3,783 0 0 501.00 4,575 4,179 4,179 502.00 5,441 5,008 9,187 502.50 5,902 2,836 12,023 Device Routing Invert Outlet Devices #1 Primary 501.00' Custom Weir/Orifice, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 10.00 19.00 Primary Outflow Max=29.58 cfs @ 12.09 hrs HW=501.82' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 29.58 cfs @ 2.91 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pale 104 502 0 a 501 w Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Hydrograph ❑ Inflow ❑ Primary 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Stage -Discharge 10 20 30 40 50 60 70 80 Discharge (cfs) ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Paze 105 502 0 501 a� w 500 7 Pond SWM/BMP2: SWM/BMP 2 (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (sq-ft) 0 1,000 2,000 3,000 4,000 5,000 Custom Stage Data 5,000 10,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 106 Summary for Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION FILTER) Inflow Area = 2.760 ac, 22.03% Impervious, Inflow Depth = 6.03" for 100-Year event Inflow = 23.44 cfs @ 12.03 hrs, Volume= 1.387 of Outflow = 23.16 cfs @ 12.05 hrs, Volume= 1.337 af, Atten= 1%, Lag= 1.0 min Primary = 23.16 cfs @ 12.05 hrs, Volume= 1.337 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 462.88' @ 12.05 hrs Surf.Area= 2,980 sf Storage= 4,564 cf Plug -Flow detention time= 36.2 min calculated for 1.336 of (96% of inflow) Center -of -Mass det. time=15.0 min ( 824.6 - 809.6 ) Volume Invert Avail.Storage Storage Description #1 461.00' 6,517 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 461.00 1,889 0 0 462.00 2,441 2,165 2,165 463.00 3,050 2,746 4,911 463.50 3,375 1,606 6,517 Device Routing Invert Outlet Devices #1 Primary 462.00' Custom Weir/Orifice, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 5.00 19.00 Primary Outflow Max=23.08 cfs @ 12.05 hrs HW=462.88' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 23.08 cfs @ 2.86 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 107 Pond SWMBMP3: SWM/BMP3 (BIO-RETENTION FILTER) Hydrograph 23.16 cfs 20 15 0 FL 10 6i 0 _ a 462 w �— Inflow 1r flov� Area=21 Ml ac ❑ Primary T Peek Elev=462.S8v_ Storage=4,564 cf 10 20 30 40 50 60 70 80 Time (hours) M Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION FILTER) Stage -Discharge 10 20 30 40 50 60 Discharge (cfs) ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pale 108 463 0 462 as w 461 Pond SWM/BMP3: SWM/BMP3 (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (sq-ft) 0 500 1,000 1,500 2,000 2,500 3,000 0 2,000 4,000 6,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 109 Summary for Pond SWM/BMP4: SWMBMP4 (RETENTION BASIN II) Inflow Area = 38.120 ac, 35.69% Impervious, Inflow Depth = 6.24" for 100-Year event Inflow = 174.18 cfs @ 12.30 hrs, Volume= 19.828 of Outflow = 157.19 cfs @ 12.44 hrs, Volume= 19.815 af, Atten= 10%, Lag= 8.3 min Primary = 78.24 cfs @ 12.44 hrs, Volume= 16.239 of Secondary = 78.96 cfs @ 12.44 hrs, Volume= 3.576 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 430.00' Surf.Area= 31,380 sf Storage= 161,961 cf Peak Elev= 436.66' @ 12.44 hrs Surf.Area= 42,505 sf Storage= 407,645 cf (245,684 cf above start) Plug -Flow detention time= 375.8 min calculated for 16.090 of (81 % of inflow) Center -of -Mass det. time=225.3 min ( 1,054.8 - 829.6 ) Volume Invert Avail.Storage Storage Description #1 422.00' 443,792 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 422.00 14,564 0 0 423.00 15,872 15,218 15,218 424.00 17,203 16,538 31,756 425.00 18,559 17,881 49,637 426.00 19,941 19,250 68,887 427.00 21,343 20,642 89,529 428.00 22,774 22,059 111,587 429.00 23,297 23,036 134,623 430.00 31,380 27,339 161,961 431.00 32,994 32,187 194,148 432.00 34,626 33,810 227,958 433.00 36,279 35,453 263,411 434.00 37,951 37,115 300,526 435.00 39,643 38,797 339,323 436.00 41,352 40,498 379,820 437.00 43,090 42,221 422,041 437.50 43,914 21,751 443,792 Device Routing Invert Outlet Devices #1 Primary 422.00' 42.0" Round Barrell (Culvert) L= 120.5' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 422.00' / 418.00' S= 0.0332 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area-- 9.62 sf #2 Device 1 430.00' 8.0" Vert. Circle Orifice - 2 YR Storm Controlling Structure C= 0.600 #3 Device 1 433.50' 24.0" W x 18.0" H Vert. Square Orifice -10 YR Storm Controlling Structure C= 0.600 #4 Device 1 435.50' 48.0" Horiz. Riser C= 0.600 Limited to weir flow at low heads #5 Secondary 435.50' Emergency Spillway, Cv= 2.68 (C= 3.35) Head (feet) 0.00 1.50 Width (feet) 15.00 27.00 J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 110 Primary OutFlow Max=77.92 cfs @ 12.44 hrs HW=436.66' (Free Discharge) L=Barrell (Culvert) (Passes 77.92 cfs of 166.45 cfs potential flow) 2=Circle Orifice - 2 YR Storm Controlling Structure(Orifice Controls 4.23 cfs @ 12.11 fps) 3=Square Orifice -10 YR Storm Controlling Structure(Orifice Controls 22.33 cfs @ 7.44 fps) =Riser (Weir Controls 51.36 cfs @ 3.52 fps) Secondary OutFlow Max=78.35 cfs @ 12.44 hrs HW=436.66' (Free Discharge) T 5=Emergency Spillway (Weir Controls 78.35 cfs @ 3.44 fps) 180 160 140 1 3 7 ° 80 u_ 60 40 20 0 Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) ❑ Inflow [ Outflow ❑ Primary [ Secondary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECTA 1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pam Mil ig15l 432 0 430 a 428 w 426 424 422 L 0 436 434 a� 2 432 c 430 428 w 426 424 422 0 Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) Stage -Discharge ❑ Total ❑ Primary Emergency Spillway - - ❑ Secondary _ Square Orifice - 10 YR Storm Controlling Structure Circle Orifice - 2 YR Storm Controlling Structure Barrell (Culvert) 50 100 150 200 250 Discharge (cfs) Pond SWM/BMP4: SWM/BMP4 (RETENTION BASIN II) Stage -Area -Storage Surface/Horizontal/Wetted Area (sq-ft) 0 10,000 20,000 30,000 40,000 100,000 200,000 300,000 400,000 Storage (cubic -feet) 0 Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 112 Summary for Pond SWM/BMP5: SWM/BMP5 (BIO-RETENTION FILTER) Inflow Area = 2.240 ac, 0.00% Impervious, Inflow Depth = 5.78" for 100-Year event Inflow = 22.16 cfs @ 11.96 hrs, Volume= 1.080 of Outflow = 21.43 cfs @ 11.99 hrs, Volume= 1.080 af, Atten= 3%, Lag= 1.5 min Primary = 21.43 cfs @ 11.99 hrs, Volume= 1.080 of Routing by Stor-Ind method, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Starting Elev= 438.25' Surf.Area= 2,733 sf Storage= 2,367 cf Peak Elev= 439.16' @ 11.99 hrs Surf.Area= 3,444 sf Storage= 5,173 cf (2,806 cf above start) Plug -Flow detention time= 47.2 min calculated for 1.025 of (95% of inflow) Center -of -Mass det. time= 5.9 min ( 814.2 - 808.3 ) Volume Invert Avail.Storage Storage Description #1 437.25' 8,361 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 437.25 2,012 0 0 438.00 2,541 1,707 1,707 439.00 3,309 2,925 4,632 440.00 4,149 3,729 8,361 Device Routing Invert Outlet Devices #1 Primary 438.25' Custom Weir/Orifice, Cv= 2.62 (C= 3.28) Head (feet) 0.00 1.50 Width (feet) 5.00 15.50 Primary Outflow Max=20.76 cfs @ 11.99 hrs HW=439.14' (Free Discharge) L1=Custom Weir/Orifice (Weir Controls 20.76 cfs @ 2.86 fps) J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 113 Pond SWMBMPS: SWM/BMP5 (BIO-RETENTION FILTER) Hydrograph 1 21.43 cfs r. 1 „R 439 0 m w 4- _t + — 4 Inflow 1 _ liiflo�e�r Ar�a=2t24Ql ac_ Primary 4- _t - + Pik--E1ev=4-39-.16 Storage--",", 71-cf- 4- A I 4 T —1 1 F 7 4- � 4 T F � 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Pond SWM/BMP5: SWM/BMP5 (BIO-RETENTION FILTER) Stage -Discharge 0 10 20 30 40 50 60 Discharge (cfs) ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 114 ..R a� 439 0 m w 438 Pond SWMBMPS: SWM/BMPS (BIO-RETENTION FILTER) Stage -Area -Storage Surface/Horizontal[Wetted Area (sq-ft) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 0 2,000 4,000 6,000 8,000 Storage (cubic -feet) Surface ❑ Storage J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 115 Summary for Link AP-1: ANALYSIS POINT 1 Inflow Area = 27.455 ac, 17.81% Impervious, Inflow Depth = 5.30" for 100-Year event Inflow = 81.62 cfs @ 12.50 hrs, Volume= 12.118 of Primary = 81.62 cfs @ 12.50 hrs, Volume= 12.118 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link AP-1: ANALYSIS POINT 1 Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 116 Summary for Link AP-2: ANALYSIS POINT 2 Inflow Area = 4.530 ac, 22.73% Impervious, Inflow Depth = 5.77" for 100-Year event Inflow = 32.07 cfs @ 12.09 hrs, Volume= 2.177 of Primary = 32.07 cfs @ 12.09 hrs, Volume= 2.177 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link AP-2: ANALYSIS POINT 2 Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 117 Summary for Link AP-3: ANALYSIS POINT 3 Inflow Area = 41.400 ac, 33.49% Impervious, Inflow Depth = 6.06" for 100-Year event Inflow = 161.25 cfs @ 12.44 hrs, Volume= 20.892 of Primary = 161.25 cfs @ 12.44 hrs, Volume= 20.892 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Link AP-3: ANALYSIS POINT 3 Hydrograph 161.25 cfs 160 1 Intlowl Are6=411.4001 ac 140 120 1 1 L)100 80 _ 60 40 L 1 —1 20 0 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type II24-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 118 Summary for Link AP-4: ANALYSIS POINT 4 Inflow Area = 2.240 ac, 0.00% Impervious, Inflow Depth = 5.78" for 100-Year event Inflow = 21.43 cfs @ 11.99 hrs, Volume= 1.080 of Primary = 21.43 cfs @ 11.99 hrs, Volume= 1.080 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs 3 3 0 FL Link AP-4: ANALYSIS POINT 4 Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Page 119 Summary for Link PROJECT -POST: POST -DEVELOPMENT CONDITION Inflow Area = 85.925 ac, 25.18% Impervious, Inflow Depth = 5.65" for 100-Year event Inflow = 278.94 cfs @ 12.44 hrs, Volume= 40.473 of Primary = 278.94 cfs @ 12.44 hrs, Volume= 40.473 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs Link PROJECT -POST: POST -DEVELOPMENT CONDITION Hydrograph 278.94 cfs Intlowl Area=86.9251 ac 250 F T —1 1 1 N 200 0 150 _ 1 1 1 I 100 7T-1 50 1 20 30 41 50 61 70 81 91 100 110 120 Inflow ❑ Primary J:\SDSKPROJ\20150290\Documents\Calculations\SWM-CBPA\HydroCAD\1st submittal\ NP-SECT.1_1ST SUBMITTAL Type 1124-hr 100-Year Rainfall=8.95" Prepared by TOWNES SITE ENGINEERING HydroCAD® 10.00-12 s/n 06356 © 2014 HydroCAD Software Solutions LLC Pate 120 Summary for Link PROJECT -PRE: PRE -DEVELOPMENT CONDITION Inflow Area = 82.160 ac, 0.00% Impervious, Inflow Depth = 4.06" for 100-Year event Inflow = 167.04 cfs @ 12.68 hrs, Volume= 27.809 of Primary = 167.04 cfs @ 12.68 hrs, Volume= 27.809 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span-- 5.00-120.00 hrs, dt= 0.05 hrs WAR 140 N 120 100 0 80 FL 0 Link PROJECT -PRE: PRE -DEVELOPMENT CONDITION Hydrograph 10 20 30 40 50 60 70 80 90 100 110 120 Time (hours) Inflow ❑ Primary