Inflow Area = 77,967 sf, 31.84% Impervious, Inflow Depth = 1.02" for 2 YR-C event

Inflow = 1.93 cfs @ 12.10 hrs, Volume= 6,616 cf

Outflow = 0.21 cfs @ 12.84 hrs, Volume= 6,616 cf, Atten= 89%, Lag= 44.5 min

Primary = 0.21 cfs @ 12.84 hrs, Volume= 6,616 cf

Routed to Pond 2P : Subsurface Infiltration Basin 1

Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 3

Automatic Starting Elev= 91.55' Surf.Area= 1,500 sf Storage= 2,325 cf

Peak Elev= 93.29' @ 12.83 hrs Surf.Area= 1,500 sf Storage= 4,929 cf (2,604 cf above start)

Plug-Flow detention time= 381.5 min calculated for 4,291 cf (65% of inflow)

Center-of-Mass det. time= 126.6 min ( 882.8 - 756.2 )

Volume Invert Avail.Storage Storage Description

#1 90.00' 8,250 cf Custom Stage Data (Prismatic) Listed below (Recalc)

Elevation (feet) Surf.Area (sq-ft) Inc.Store (cubic-feet) Cum.Store (cubic-feet)

90.00 1,500 0 0

95.50 1,500 8,250 8,250

Device Routing Invert Outlet Devices

#1 Device 3 91.00' 2.5" Vert. Orifice C= 0.600 Limited to weir flow at low heads

#2 Device 3 95.00' 48.0" x 48.0" Horiz. Grate C= 0.600

#3 Primary 87.48' 12.0" Round Culvert L= 28.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 87.48' / 87.00' S= 0.0171 ' /' Cc= 0.900 n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf

Primary OutFlow Max=0.21 cfs @ 12.84 hrs HW=93.29' TW=91.58' (Dynamic Tailwater)

3=Culvert (Passes 0.21 cfs of 5.90 cfs potential flow)

1=Orifice (Orifice Controls 0.21 cfs @ 6.29 fps)

2=Grate ( Controls 0.00 cfs)