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

*No sediment capacity defined
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 16.00 18.00 182.00 5.00 0.0150 6,872.00 2
Emergency Spillway
Spillway Elev Crest Length
(ft)
Left
Sideslope
Right
Sideslope
Bottom
Width (ft)
6,875.00 45.00 2.00:1 2.00:1 20.00
Pond Results:
Peak Elevation: 6,873.09 ft
H'graph Detention Time:5.81 hrs
Pond Model:CSTRS
Dewater Time: 2.75 days
Trap Efficiency:99.34 %
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)
6,855.00 0.047 0.000 0.000 Top of Sed. Storage
6,855.01 0.048 0.000 0.000
6,856.00 0.102 0.073 0.000
6,857.00 0.156 0.201 0.000
6,858.00 0.191 0.374 0.000
6,859.00 0.228 0.583 0.000
6,860.00 0.266 0.830 0.000
6,861.00 0.306 1.116 0.000
6,862.00 0.348 1.443 0.000
6,863.00 0.391 1.812 0.000
6,864.00 0.436 2.225 0.000
6,865.00 0.483 2.684 0.000
6,866.00 0.532 3.192 0.000
6,867.00 0.582 3.749 0.000
6,868.00 0.635 4.357 0.000 Low hole SPW #1
6,869.00 0.689 5.019 0.473 16.94*
6,870.00 0.746 5.736 0.669 12.98*
6,871.00 0.804 6.511 0.819 11.45*
Filename: Exhibit 7 Item 23 Part B 10-Yr 24-Hr Section 25 During Mining.sc4 Printed 03-17-2022
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