PERMFILE42263

• Permit No: C1981020
• IBM Index Class Name: Permit File
• Doc Date: 1/20/2004
• Section_Exhibit Name: Appendix M‎(i)‎ to M‎(v)‎ Hydrologic Data
• Media Type: D
• Archive: No

SHERIDAN ENTERPRISES, INC.
COMA PROSPECT
10 YR FLOW
Drainage Calculations
Ref. - Technical Manual No. 1 (Manual for Estimating Fiood Characteristics
of Natural-Flow in Colorado)(by J.F. McClain and R. D. Jarrett, U. 5.
Geological Survey)
Southern Plateau Region (of Colorado) Area (m 12)
Qio = 59.7A(•709)
1. Combined Watersheds A 8 B
Drainage Area = 59 Ac + 647 Ac = 706 Ac
2
(706 Ac)(im~A~) = 1.103 miz
Qto = 59.7 (1.103)('709) = 64 CF5
Culvert Sizing (C.M.P. with Inlet Control).
Ref. - (Handbook of Steel Drainage E Highway Construction Products)
• Fig. 4-18 (Pg. 161); Scale 1 (Headwall or End Section)
Q = 64 CFS - D = 48"D C.M.P.
Check, with D =48"8 Q = 80 CF5
Hw - l.t 1.50 ~
D
2. Watershed A
Drainage Area = 59 Ac
2
(59 Ac)(Im~ Ac) _ .092 mi?
Qio ° 59.7 (.092)(•709) = 11 CF5
Culvert sizing
Q = 1T CFS D = 21"ts C.M.P.
Check, with D 21"P, Q = as LFS
HW = 1.2 - 1.50
D
n
~"l -