PERMFILE52028

• Permit No: C1981020A
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Section_Exhibit Name: Appendix M‎(i)‎ to M‎(viiI)‎
• Media Type: D
• Archive: Yes

• ESTIMATE OF FLOOD CHARACTERISTICS FOR WATERSHED B -
MUNGER CREEK TRIBUTORY RUNNING THROUGH
MUNGER MINE SITE, MUNGER CREEK WATERSHED,
GARFIELD COUNTY, COLORADO
Procedure for ungaged sites with streams located entirely in
our flood-characteristic region.
1 - Identify flood regions Southern Plateau Region (From Figure 2)
2 - Select regression equations for peak discharges and depths
of selected recurrence - interval floods: See Table 4
3 - Compute basin and climate parameters required for 3:
Drainage Area A = O.llmi2 (planimetered)
• 4 - Solve Equations:
Peak Discharges of RI Floods
410 - 59.7 (.11)'709 = 12cfs
450 - 89'1 (.11)'709 = 19cfs
4100 = 103 (.11)'710 = 21cfs
4500 - 137 (.11)'713 = 26cfs
Flood Depths
D10 = 1.25 (.11)•261 = 0.7 ft
D50 = 1.54 (.11)'261 = 0.9 ft
D100 - 1.64 (.11)'254 = 0.9 ft
D500 = 1.98 (.11)•239 = 1.2 ft
STD Error of Estimates, $
Average Range
47 +58 to -36
50 +62 to -38
53 +66 to -40
65 +84 to -46
25 +28 to -22
34 +40 to -28
36 +42 to -30
44 +53 to -35
• Reference: CWCB Technical Manual No. 1, 1976.