2017-07-18_PERMIT FILE - C1981019A ‎(2)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 7/18/2017
• Doc Name: Sediment Control for Initial Disturbance Coal Stockpile Pond Using Total Containment
• Section_Exhibit Name: Volume 18 Exhibit 7, Item 23 Part M
• Media Type: D
• Archive: Yes

SEDCAD 4 for Windows
Structure Detail:
Structure #1 (Erodible Channel)
Triangular Erodible Channel Inputs:
Material: Shales and hardpans
Left Right
Freeboard Freeboard Freeboard
Limiting
Sideslope Sideslope Slope (%) Manning's n
Mult. x
Velocity
Ratio Ratio
Depth (ft) % of Depth (VxD)
(fps)
1.5:1 1.5:1 2.0 0.0250
X -Section Area:
6.0
Erodible Channel Results:
Structure #2 (Pond)
Pond Inputs:
Pond Results:
Initial Pool Elev: 7,183.50 ft
Initial Pool: 0.61 ac -ft
Emergency Spillwa
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
7,185.00 20.00 2.00:1 2.00:1 20.00
Peak Elevation: 7,184.74 ft
Dewater Time: 0.00 days
Dewatering time is calculated from peak stage to lowest spillway
Elevation -Capacity -Discharge Table
5
Filename: TemporarySump sc4 Printed 05-16-2017
Exh. 7-23M-13 Revision Date: 5/18/2017
Q --;i ;— AIn • TR -I I I
w/o Freeboard w/ Freeboard
Design Discharge:
1.10 cfs
Depth:
0.50 ft
Top Width:
1.49 ft
Velocity:
2.95 fps
X -Section Area:
0.37 sq ft
Hydraulic Radius:
0.207 ft
Froude Number:
1.04
Initial Pool Elev: 7,183.50 ft
Initial Pool: 0.61 ac -ft
Emergency Spillwa
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
7,185.00 20.00 2.00:1 2.00:1 20.00
Peak Elevation: 7,184.74 ft
Dewater Time: 0.00 days
Dewatering time is calculated from peak stage to lowest spillway
Elevation -Capacity -Discharge Table
5
Filename: TemporarySump sc4 Printed 05-16-2017
Exh. 7-23M-13 Revision Date: 5/18/2017
Q --;i ;— AIn • TR -I I I