2022-02-09_PERMIT FILE - M2021046 ‎(2)‎

• Permit No: M2021046
• IBM Index Class Name: Permit File
• Doc Date: 2/9/2022
• Doc Name Note: Appendix N JESIK Surface Water Management
• Doc Name: Adequacy Review Response
• From: Zephyr Gold USA Ltd
• To: DRMS
• Email Name: TC1
• Email Name: MAC
• Media Type: D
• Archive: No

Hydrograph Report Project Name:Dawson Mine
Hydrology Studio v 3.0.0.20 12-15-2021
Post Basin C Hyd. No. 7
Hydrograph Type = Rational Peak Flow = 45.22 cfs
Storm Frequency = 10-yr Time to Peak = 0.03 hrs
Time Interval = 1 min Runoff Volume = 5,426 cuft
Drainage Area = 9.23 ac Runoff Coeff. = 0.61*
Tc Method = TR55 Time of Conc. (Tc) = 2.0 min
OF Curve = Canon City.idf Intensity = 8.03 in/hr
Freq. Corr. Factor = 1.00 Asc/Rec Limb Factors = 1/1
*Composite C Worksheet
AREA(ac) C DESCRIPTION
1.37 0.85 Gravel Road
1.54 0.85 Laydown Area
4.26 0.60 Stockpile Areas
2.06 0.30 Undisturbed
9.23 0.61
Qp = 45.22 cfs
52
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48
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Time (min)
B10