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Stormwater 0 EXISTING SOUTH H USE ROOF FRONT AWN & DRIV WAY FRONT RF& REAR A AID ROOF INFILTRATION DRIVEWAY GRASSED TRENCH SWALE 11111 OFFSITE (Subca) Reach Pon ti Drainage Diagram for 291653-LOT 9 PRE&POST Prepared by{enter your company name here}, Printed 11/15/2020 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC I 291653- LOT 9 PRE & POST Prepared by {enter your company name here} Printed 11/15/2020 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 0.832 30 Woods, Good, HSG A (3S, EX) 0.294 39 >75% Grass cover, Good, HSG A (2S, 3S) 0.047 98 Paved parking, HSG A (2S) 0.046 98 Roofs, HSG A (1S, 3S) 1.218 TOTAL AREA 291653- LOT 9 PRE & POST Prepared by{enter your company name here} Printed 11/15/2020 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 1.218 HSG A 1S, 2S, 3S, EX 0.000 HSG B 0.000 HSG C 0.000 HSG D 0.000 Other 1.218 TOTAL AREA 291653- LOT 9 PRE & POST Type 1124-hr 25 YR STORM Rainfall=4.50" Prepared by{enter your company name here} Printed 11/15/2020 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC Page 4 Time span=0.00-30.00 hrs, dt=0.05 hrs, 601 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: SOUTH HOUSE ROOF Runoff Area=880 sf 100.00% Impervious Runoff Depth=4.26" Flow Length=16' Slope=0.5833'/' Tc=0.1 min CN=98 Runoff=0.15 cfs 0.01 af Subcatchment 2S: FRONT LAWN & Runoff Area=4,532 sf 44.88% Impervious Runoff Depth=1.33" Flow Length=55' Slope=0.0272 '/' Tc=0.8 min CN=65 Runoff=0.28 cfs 0.01 af Subcatchment 3S: FRONT ROOF & REAR Runoff Area=21,125 sf 5.39% Impervious Runoff Depth=0.09" Flow Length=176' Tc=0.9 min CN=38 Runoff=0.00 cfs 0.00 af Subcatchment EX: EXISTING Runoff Area=26,537 sf 0.00% Impervious Runoff Depth=0.00" Flow Length=190' Tc=17.0 min CN=30 Runoff=0.00 cfs 0.00 af Pond 4P: DRIVEWAY GRASSED SWALE Peak Elev=502.69' Storage=125 cf Inflow=0.28 cfs 0.01 af Discarded=0.07 cfs 0.01 af Primary=0.00 cfs 0.00 af Outflow=0.07 cfs 0.01 af Pond 6P: ROOF INFILTRATION TRENCH Peak EIev=1.91' Storage=0.00 af Inflow=0.15 cfs 0.01 af Outflow=0.02 cfs 0.01 af Link IL: OFFSITE Inflow=0.00 cfs 0.00 af Primary=0.00 cfs 0.00 af Total Runoff Area= 1.218 ac Runoff Volume= 0.02 af Average Runoff Depth = 0.22" 92.36%Pervious= 1.125 ac 7.64%Impervious=0.093 ac 291653- LOT 9 PRE & POST Type 1124-hr 25 YR STORM Rainfall=4.50" Prepared by{enter your company name here} Printed 11/15/2020 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment 1 S: SOUTH HOUSE ROOF Runoff = 0.15 cfs @ 11.89 hrs, Volume= 0.01 af, Depth= 4.26" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs Type II 24-hr 25 YR STORM Rainfall=4.50" Area (sf) CN Description 880 98 Roofs, HSG A 880 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.1 16 0.5833 3.18 Sheet Flow, SHEET FLOW Smooth surfaces n= 0.011 P2= 2.40" Summary for Subcatchment 2S: FRONT LAWN & DRIVEWAY Runoff = 0.28 cfs @ 11.91 hrs, Volume= 0.01 af, Depth= 1.33" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs Type II 24-hr 25 YR STORM Rainfall=4.50" Area (sf) CN Description 2,034 98 Paved parking, HSG A 2,498 39 >75% Grass cover, Good, HSG A 4,532 65 Weighted Average 2,498 55.12% Pervious Area 2,034 44.88% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 55 0.0272 1.20 Sheet Flow, SHEET FLOW Smooth surfaces n= 0.011 P2= 2.40" Summary for Subcatchment 3S: FRONT ROOF & REAR YARD Runoff = 0.00 cfs @ 14.94 hrs, Volume= 0.00 af, Depth= 0.09" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs Type II 24-hr 25 YR STORM Rainfall=4.50" Area (sf) CN Description 1,139 98 Roofs, HSG A 10,299 39 >75% Grass cover, Good, HSG A 9,687 30 Woods, Good, HSG A 21,125 38 Weighted Average 19,986 94.61% Pervious Area 1,139 5.39% Impervious Area 291653- LOT 9 PRE & POST Type ll 24-hr 25 YR STORM Rainfall=4.50" Prepared by {enter your company name here} Printed 11/15/2020 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC Page 6 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.3 96 0.1042 4.84 Shallow Concentrated Flow, SHALLOW CONC FLOW Grassed Waterway Kv= 15.0 fps 0.6 80 0.2250 2.37 Shallow Concentrated Flow, SHALLOW CONC. FLOW Woodland Kv= 5.0 fps 0.9 176 Total Summary for Subcatchment EX: EXISTING Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0.00 af, Depth= 0.00" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs Type II 24-hr 25 YR STORM Rainfall=4.50" Area (sf) CN Description 26,537 30 Woods, Good, HSG A 26,537 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.7 150 0.1200 0.15 Sheet Flow, SHEET FLOW Woods: Light underbrush n= 0.400 P2= 2.40" 0.3 40 0.2250 2.37 Shallow Concentrated Flow, SHALLOW CONC. FLOW Woodland Kv= 5.0 fps 17.0 190 Total Summary for Pond 4P: DRIVEWAY GRASSED SWALE Inflow Area = 0.104 ac, 44.88% Impervious, Inflow Depth = 1.33" for 25 YR STORM event Inflow = 0.28 cfs @ 11.91 hrs, Volume= 0.01 af Outflow = 0.07 cfs @ 12.02 hrs, Volume= 0.01 af, Atten= 73%, Lag= 6.8 min Discarded = 0.07 cfs @ 12.02 hrs, Volume= 0.01 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.00 af Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs Peak Elev= 502.69' @ 12.02 hrs Surf.Area= 323 sf Storage= 125 cf Plug-Flow detention time= 11.4 min calculated for 0.01 af(100% of inflow) Center-of-Mass det. time= 11.4 min ( 871.0 - 859.6 ) Volume Invert Avail.Storage Storage Description #1 502.00' 243 cf Custom Stage Data(Prismatic) Listed below(Recaic) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 502.00 35 0 0 503.00 450 243 243 291653- LOT 9 PRE & POST Type 1124-hr 25 YR STORM Rainfall=4.50" Prepared by {enter your company name here} Printed 11/15/2020 HydroCAD®9.10 s/n 03732 ©2010 HydroCAD Software Solutions LLC Page 7 Device Routing Invert Outlet Devices #1 Discarded 502.00' 10.000 in/hr Exfiltration over Surface area #2 Primary 503.00' 5.0' long (Profile 10) Broad-Crested Rectangular Weir Head (feet) 1.97 2.46 2.95 3.94 4.92 Coef. (English) 3.51 3.48 3.42 3.48 3.57 Qiscarded OutFlow Max=0.07 cfs @ 12.02 hrs HW=502.69' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.07 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=502.00' (Free Discharge) t2=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Summary for Pond 6P: ROOF INFILTRATION TRENCH Inflow Area = 0.020 ac,100.00% Impervious, Inflow Depth = 4.26" for 25 YR STORM event Inflow = 0.15 cfs @ 11.89 hrs, Volume= 0.01 af Outflow = 0.02 cfs @ 11.60 hrs, Volume= 0.01 af, Atten= 84%, Lag= 0.0 min Discarded = 0.02 cfs @ 11.60 hrs, Volume= 0.01 af Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs Peak Elev= 1.91' @ 12.02 hrs Surf.Area= 0.002 ac Storage= 0.00 af Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 17.9 min ( 758.2 - 740.3 ) Volume Invert Avail.Storage Storage Description #1 0.00' 0.00 af 5.00'W x 20.00'L x 3.00'H 2OFT X 5FT TRENCH 0.01 af Overall - 0.00 af Embedded = 0.01 af x 40.0% Voids #2 0.00' 0.00 af StormTech SC-310 Inside#1 Effective Size= 28.9"W x 16.0"H => 2.07 sf x 7.12'L = 14.7 cf Overall Size= 34.0"W x 16.0"H x 7.56'L with 0.44' Overlap 0.00 af Total Available Storage Device Routing Invert Outlet Devices #1 Discarded 0.00' 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.02 cfs @ 11.60 hrs HW=0.04' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.02 cfs) Summary for Link 1 L: OFFSITE Inflow Area = 0.589 ac, 12.37% Impervious, Inflow Depth = 0.07" for 25 YR STORM event Inflow = 0.00 cfs @ 14.94 hrs, Volume= 0.00 af Primary = 0.00 cfs @ 14.94 hrs, Volume= 0.00 af, Atten= 0%, Lag= 0.0 min Primary outflow= Inflow, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs oc a14. z CC o3 la20° CI)O 2 Q 2c �rt U W Q ` Ca �" _ � c� a= x to c Z 0 c co y t 'O,'c .S) O • :Y.j AN - ' . i' O A \\ #,.eIt." 4 , k*8_ ,„ 0 %_.z.,‘ la k'p 4111111141%.''' 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