PERMFILE50611

• Permit No: C1981041A
• IBM Index Class Name: Permit File
• Doc Date: 10/11/2002
• Doc Name: A-2 Part 1
• Section_Exhibit Name: Tab 13 Appendix 13-2 TOC to pg RSN-51
• Media Type: D
• Archive: Yes

SEDCAD+ BASIN CAPACITY UTILITY
pondl+2
ELEVATION STAGE AREA CAPACITY
(ft) (ac) {ac-ft)
_S 3 =C 1
50.00 0.00 0.23 0.00
50.20 0.20 0.29 0.05
50.40 0.40 0.35 0.12
50.60 0.60 0.42 0.19
50.80 0.80 0.50 0.29

51.00
1.00
0.58
0.39 1.15 A.F, excess
51.20 1.20 0.67 0.52 capacity
51.40 1.40 0.76 0.66
51.60 1.60 0.85 0.82
5 .80 1.80 0.97 1.00
52.00 2.00 1.08 1.21 Design sediment -
52.20 2.20 1.20 1.44
52.40 2.40 1.34 1.69 Max. Sediment Level 752.
52.60 2.60 1.48 1.97
52.80 2.80 1.62 2.28
53.00 3.00 1.78 2.62 Design runoff - 1.99 A.F
53.20 3.20 1.94 2.99
53.40 3.40 2.11 3.40
53.60 3.60 2.28 3.84 Emergency spillway
53.80 3.80 2.47 4.31
54.00 4.00 2.65 4.$2
~~
Design for combined sediment control in Ponds 1 and 2 to contain
a 25 year 24 hour storm event. Calculations based upons design
assumptions in Appendix X, volume 3.
Pond 1 - Area = 24.5 acres, CN 85 (App. X)
25 year storm event runoff = 0.65 inches (App. X)
Runoff for a 25 year event 0.65 x 24.5 / 12 = 1.33 A-F
Sediment storage = 0.36 A-F (App. X)
Pond 2 - Area = 18.0 acres, CN 80 (App.X)
25 year storm event runoff = 0.44 inches (App. X)
Runoff for a 25 year event = 0.44 x 18.9 / 12 = 0.66 A-F
Sediment storage = 0.10 A-F (App. X)
Combined Capacity Requirements
Runoff for a 25 year event = 1.33 + 0.66 = 1.99 A-F
Sediment Storage = 0.36 + 0.10 = .46 A-F
Total storage = 1.99 + 0.46 = 2.45 A-F
f •
UTL - 5 New 12/16/94