2001-12-11_PERMIT FILE - C1996084 ‎(6)‎

• Permit No: C1996084
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 15-21 MINE AREA P5 SEDIMENT CONTROL POND 5-1
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
Copyright 1998 Pamela J. Schwab
Civil Sohware Design
•
w/o Freeboard w/ Freeboard
X-Section Area: 10.94 sq k
Hydraulic Radius: 0.360
Froude Number: 1.44
Structure #5 (Pond~1
mid, fill
Pond Inputs:
Initial Pool Elev: 6,735.00
Initial Pool: 2.11 ac-k
`Sediment Storage: 4.25 ac-k
Dead Space: 20.00
*Sediment capacity based on Average Annual R of 70.0 for 3 year(s)
Perforated Riser
Riser Riser Height Barrel Barrel Barrel Slope Number of
'
Diameter (k) Diameter Length (k) (%) Manning
s n Spillway Elev Holes per
(in) (in) Elev
12.00 8.00 8.00 50.00 3.00 0.0240 6,737.00 9
• Emergency Spillway
Spillway Elev Crest Length Lek Right Bottom
(k) Sideslope Sideslope Width (k)
6,740.00 10.00 2.50:1 2.50:1 2.00
Pond Results:
Peak Elevation: 6,738.69
H'graph Detention Tme: 12.80 hrs
Pond Model: CSTRS
Dewater Time: 3.82 days
Trap Efficiency: 90.70
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table
•
Area Capacity Discharge Dewater
Elevation Tme
(ac) (ac-k) (~s) (hrs)
6,733.47 1.332 0.000 0.000 Top of Sed. Storage
6,733.50 1.334 0.034 0.000
3
Filename: 100pond5-1.sc4 Printed 04-24-2001