2016-08-08_PERMIT FILE - C1981019A ‎(115)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 8/8/2016
• Doc Name: Sediment Control System Analysis at End of Mining
• Section_Exhibit Name: Volume 18 Exhibit 7 Item 23 Part I
• Media Type: D
• Archive: Yes

SEDCAD 4 for Windows
091
Structure #16 (Pond)
No 7 stock pond
Pond Inputs:
Pond Results:
Initial Pool Elev:
w/o Freeboard w/ Freeboard
X -Section Area:
17.44 sq ft
Hydraulic Radius:
1.026 ft
Froude Number:
1.33
Manning's n:
0.0460
Dmin:
3.00 in
D50:
6.00 in
Dmax:
9.00 in
Initial Pool Elev:
92.00 ft
Initial Pool:
0.17 ac -ft
*Sediment Storage:
0.00 ac -ft
Dead Space:
20.00%
*No sediment capacity defined
Emergence Spillway
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
100.00 20.00 2.00:1 2.00:1 20.00
Peak Elevation:
101.29 ft
H'graph Detention Time:
1.08 hrs
Pond Model:
CSTRS
Dewater Time:
0.79 days
Trap Efficiency:
75.66%
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)
90.00
0.050
0.000
0.000 Top of Sed. Storage
90.01
0.050
0.001
0.000
90.50
0.065
0.029
0.000
91.00
0.083
0.066
0.000
91.50
0.103
0.112
0.000
92.00
0.125
0.169
0.000
92.50
0.148
0.237
0.000
Filename Rev 3 PR04 East Side Ponds sed EOM 1024.sc4 Printed 02-13-2016
Exh. 7-23I-74 Revision Date: 2/15/2016
Revision No.: PR -04