2010-12-17_REVISION - C1981019 ‎(128)‎

• Permit No: C1981019
• IBM Index Class Name: REVISION
• Doc Date: 12/17/2010
• Doc Name: Exhibit 7 Item 23 Erosion and Sedimentation Part 2
• Type & Sequence: PR3
• Email Name: JRS
• Media Type: D
• Archive: No

•
SEDCAD 4 for Windows
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Bottom Left Right
Freeboard Freeboard Freeboard
Sideslope Sideslope Slope ( %)
Width (ft) Ratio Ratio
Mult. x
Depth (ft) % of Depth (VxD)
5.00 2.0:1 2.0:1 3.2
0.30
Riprap Channel Results:
PADER Method - Steep Slope Design
Is
I
Structure #10 (Pond)
LCX -IN
Pond Inputs:
Pond Results:
*Sediment capacity based on Average Annual R of 19.0 for 1 year(s)
Emergency Spillway
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
6,737.00 20.00 2.00:1 2.00:1 50.00
Initial Pool Elev:
w/o Freeboard w/ Freeboard
Design Discharge:
1,027.44 cfs
Depth.
5.38 ft 5.68 ft
Top Width:
26.54 ft 27.74 ft
Velocity:
12.10 fps
X- Section Area:
84,91 sq ft
Hydraulic Radius:
2.920 ft
Froude Number:
1.19
Manning's n:
0.0450
Dmin:
7.00 In
D50:
12.00 In
Dmax:
18.00 in
Initial Pool Elev:
6,719.50 ft
Initial Pool:
8.92 ac -ft
*Sediment Storage:
21.43 ac -ft
Dead Space:
20.00%
Peak Elevation: 6 ft
H'graph Detention Time:
3.03 hrs
Pond Model:
CSTRS
DewaterTime:
0.64 days
Trap Efficiency:
100.00
40
Filename: 100- year_Collom_Ponds (With Riser).so4 Printed 01 -22 -2009
Exh. 7 -23A -158 Revision Date: 12/15/10
Revision No.: PR -03