PERMFILE51108

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 08H‎(1)‎ Montgomery Watson Evaluation of Pond D 1999
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
Copynghf 1996 Pamela J. Schwan
Civil Software Design
•
Structure #1 (Pond
Pond D
Pond Inputs:
Structure Detai/:
Initial Pool Elev: 6,847.40
Initial Pool: 7.51 ac-ft
'Sediment Storage: 2.49 ac-ft
Dead Space: 20.00
'Sediment capacity based on Average Annua/ R of 30.0 for 1 year(s)
Perforated Riser
Riser Riser Heigh[ Barrel Barrel Barrel Slope Number of
'
Diameter (R) Diameter Length (R) (%) Manning
s n Spillway Elev Holes per
(in) (in) Elev
24.00 6.60 ~ 18.00 80.00 0.901 0.0250 6,850.40 4
Emergency Spillway
Spillway Elev Crest Length Left Righ[ Bottom
(R) Sideslope Sideslope Width (R)
6,853.00 10.00 3.00:1 3.00:1 90.00
Pond Results:
Peak Elevation: 6,651.06
H'graph Detention Tme: 11.10 hrs
Dewater Time: 2.99 days
Trap Efficiency: 90.49
Dewatering time is ca/cu/aced from peak stage to lowest spillway
Elevation-Capacity-Discharoe Table

Elevation Area

(ac) Capacity

(ac-ft) Discharge

(cfs) Dewater
Time
(hrs)
6,844.16 1.736 0.000 0.000 Top of Sed. Storage
6,844.40 1.896 0.440 0.000
6,849.45 1.930 0.537 0.000
6,844.90 2.055 1.433 0.000
6,845.40 2.199 2.496 0.000
6,845.90 2.347 3.632 0.000
Filename: pondDl.sc4
Printed OS-O6-1999
D-17