2022-07-12_PERMIT FILE - C1981019A ‎(12)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 7/12/2022
• Doc Name: Section 25 Pond Sediment Control During Mining
• Section_Exhibit Name: Volume 18 Exhibit 7 Item 23 Part B
• Media Type: D
• Archive: Yes

Pond Inputs:
Initial Pool Elev: 7,116.00 ft
Initial Pool: 0.97 ac-ft
Perforated Riser
Riser
Diameter
(in)
Riser Height
(ft)
Barrel
Diameter
(in)
Barrel
Length (ft)
Barrel Slope
(%)Manning's n Spillway Elev
(ft)
Number of
Holes per
Elev
18.00 11.00 18.00 170.00 3.00 0.0150 7,118.00 2
Emergency Spillway
Spillway Elev Crest Length
(ft)
Left
Sideslope
Right
Sideslope
Bottom
Width (ft)
7,125.00 46.00 3.00:1 3.00:1 30.00
Pond Results:
Peak Elevation: 7,124.45 ft
Dewater Time: 0.96 days
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table
Elevation Area
(ac)
Capacity
(ac-ft)
Discharge
(cfs)
Dewater
Time
(hrs)
7,105.00 0.000 0.000 0.000
7,106.00 0.010 0.003 0.000
7,107.00 0.025 0.020 0.000
7,108.00 0.038 0.052 0.000
7,109.00 0.053 0.097 0.000
7,110.00 0.075 0.161 0.000
7,111.00 0.093 0.244 0.000
7,112.00 0.112 0.347 0.000
7,113.00 0.132 0.469 0.000
7,114.00 0.154 0.611 0.000
7,115.00 0.178 0.777 0.000
7,116.00 0.205 0.969 0.000 Low hole SPW #1
7,117.00 0.235 1.188 0.473 5.63*
7,118.00 0.267 1.439 0.669 5.35 Spillway #1
7,119.00 0.301 1.723 8.509 8.90
7,120.00 0.340 2.043 12.033 0.65
7,121.00 0.387 2.407 14.738 0.55
7,122.00 0.433 2.816 17.018 0.50
7,123.00 0.485 3.275 19.026 0.50
Filename: Exhibit 7 Item 23 Part B 25-Yr 24-Hr Section 25 During Mining.sc4 Printed 03-17-2022
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