PERMFILE135209

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 9/2/2004
• Doc Name: Attachment 1 to 9
• Section_Exhibit Name: Exhibit 7 West Pit Pond - 008A
• Media Type: D
• Archive: Yes

SEDCAD 4 for Windows
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12
Pond Inputs:
r1
J
Initial Pool Elev: 6,830.00
Initial Pool: 5.46 ac-ft
*Sediment Storage: 0.02 ac-ft
Dead Space: 20.00
*Sediment capacity based on Average Annua/ R of 19.0 for 3 year(s)
Perforated Riser
Riser Riser Height Barrel Barrel Barrel Slope
' Number of
Diameter (ft) Diameter Length (ft) (070) Manning
s n Spillway Elev Holes per
(in) (in) Elev
18.00 11.60 18.00 173.00 8.70 0.0250 6,837.00 3
Emergency Spillway
Pond Results:
:7
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
6,838.00 21.00 1.50:1 1.50:1 24.00
Peak Elevation: 6,831.00
H'graph Detention Tme: 6.79 hrs
Pond Model: CSTRS
Dewater Time: 0.68 days
Trap Efficiency: 64.02
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table

Elevation Area

(ac) Capacity

(ac-ft) Discharge Dewater
Time
(cfs) (hrs)
6,821.11 0.163 0.000 0.000 Top of Sed. Storage
6,821.50 0.275 0.084 0.000
6,822.00 0.474 0.269 0.000
6,822.50 0.499 0.512 0.000
6,823.00 0.525 0.768 0.000
6,823.50 0.545 1.036 0.000
6,824.00 0.564 1.313 0.000
6,824.50 0.584 1.600 0.000
6,825.00 0.604 1.897 0.000
6,825.40 0.620 2.142 0.000
6,825.50 0.624 2.204 0.000
Filename: WestPit-10ycsc4 Printed 07-16-2002