2001-12-11_PERMIT FILE - C1996084

• Permit No: C1996084
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 15-26 MINE AREA P7 SEDIMENT CONTROL POND 7-4
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
Copynghf 1998 Pamela J. Schxab
Civil Sofhvare Design
w/o Freeboard w/ Freeboard
• Froude Number: 1.98
Structure #3 (Pond1
n. coal, slope
Pond Inputs:
Initial Pool Elev: 6,636.00
Initial Pool: 1.34 ac-R
'Sediment Storage: 1.54 ac-R
Dead Space: 20.00
*sediment capacity based on Average Annual R of 70.0 for 2 year(s)
Perforated Riser
Riser Riser Height Barrel Barrel Barrel Slope Number of
'
Diameter (R) Diameter Length (tt) (%) Manning
s n Spillway Elev Holes per
(in) (in) Elev
12.00 6.00 8.00 80.00 3.00 0.0240 6,638.00 4
Emergency Spillway
• Spillway Elev Crest Length LeR Right Bottom
(R) Sldeslope Sldeslope Width (R)
6,640.00 10.00 2.50:1 2.50:1 2.00
Pond Results:
Peak Elevation: 6,639.11
H'graph Detention Tme: 8.28 hrs
Pond Model: CSTRS
Dewater Time: 6.09 days
Trap Effciency: 90.73
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table
•
Area Capaaty Discharge Dewater
Elevation Time
(ac) (ac-R) (cfs) (hrs)
6,633.66 0.508 0.000 0.000 Top of Sed. Storage
6,634.00 0.526 0.177 0.000
6,634.50 0.552 0.447 0.000
6,635.00 0.578 0.729 0.000
Filename: 100pond7-4.sc4 Printed 04-24-2001