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Type II 24-hr 10-Year Rainfall=4.26"21308 - PROPOSED Printed 7/15/2021Prepared by {enter your company name here} Page 24HydroCAD® 10.10-6a s/n 02202 © 2020 HydroCAD Software Solutions LLC Summary for Pond 1P: FILTRATION BASIN Inflow Area = 1.367 ac, 87.34% Impervious, Inflow Depth = 3.80" for 10-Year event Inflow = 7.92 cfs @ 11.97 hrs, Volume= 0.433 af Outflow = 0.81 cfs @ 12.35 hrs, Volume= 0.433 af, Atten= 90%, Lag= 22.9 min Primary = 0.81 cfs @ 12.35 hrs, Volume= 0.433 af Routing by Stor-Ind method, Time Span= 0.00-240.00 hrs, dt= 0.01 hrs Peak Elev= 926.82' @ 12.35 hrs Surf.Area= 7,252 sf Storage= 7,794 cf Plug-Flow detention time= 173.1 min calculated for 0.433 af (100% of inflow) Center-of-Mass det. time= 173.1 min ( 925.9 - 752.7 ) Volume Invert Avail.Storage Storage Description #1A 925.25' 6,270 cf 58.50'W x 123.96'L x 3.48'H Field A 25,199 cf Overall - 9,523 cf Embedded = 15,676 cf x 40.0% Voids #2A 925.75' 9,523 cf Prinsco HydroStor v2 HS75 x 204 Inside #1 Effective Size= 45.4"W x 29.0"H => 6.55 sf x 7.08'L = 46.4 cf Overall Size= 51.0"W x 29.7"H x 7.26'L with 0.18' Overlap 204 Chambers in 12 Rows Cap Storage= 2.8 cf x 2 x 12 rows = 66.0 cf 15,793 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Device 3 925.25'1.600 in/hr Exfiltration over Surface area #2 Device 4 926.45'12.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Device 4 923.75'6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Primary 923.75'12.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.81 cfs @ 12.35 hrs HW=926.82' (Free Discharge) 4=Orifice/Grate (Passes 0.81 cfs of 6.06 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.54 cfs @ 2.06 fps) 3=Orifice/Grate (Passes 0.27 cfs of 1.59 cfs potential flow) 1=Exfiltration (Exfiltration Controls 0.27 cfs)