2010-04-15_PERMIT FILE - C1981018 ‎(5)‎

• Permit No: C1981018
• IBM Index Class Name: Permit File
• Doc Date: 4/15/2010
• Doc Name: D Portal Area Sediment Pond & Diversion Ditch Design Calculations
• Section_Exhibit Name: Illustration 07
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
L.
• Structure #2 (Null
(generic channel
Structure #1 (Pond
DP - -1 Pond
Pond Inputs:
Structure Detail;
Initial Pool Elev:
5,623.68 ft
Initial Pool:
1.03 ac -ft
*Sediment Storage:
3.63 ac -ft
Dead Space:
20.00
*Sediment capacity based on Average Annual R of 16.6 for 23 year(s)
Enhanced Perf. Riser
Riser
Riser Height
Diameter
Barrel
Barrel Barrel Slope
Diameter
Number of
Spillway Elev
Manning s n Holes per
(ft)
(in)
Len ft o
Length () ( /0)
(in) g
(ft) Elev
24.00 9.00
17.50 148.00 9.46
0.0120 5,625.00 1
•
Emergency Spillway
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
5,626.00 30.00 2.00:1 2.00:1 16.00
Pond Results:
Peak Elevation:
5,625.04 ft
H'graph Detention Time:
15.07 hrs
Pond Model:
CSTRS
Dewater Time:
14.06 days
Trap Efficiency:
98.56%
Dewatering time is calculated from peak stage to lowest spillway
Elevation - Capacity- Discharge Table
Filename: DP -1 2008 Overhaul slip liner in outlet w sedimentology- 10yr.sc4 Printed 10 -08 -2009