PERMFILE113314

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 7/30/2007
• Doc Name: Collection/Diversion Ditches and Culverts Design Parameters
• Section_Exhibit Name: Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-1
• Media Type: D
• Archive: Yes

• Graphical Peak Discharge
Project: NUCLA MINE By: GL Date: 02/17/06
Location: DITCH C20 Checked: Date:
Developed
1. Data:
Drainage area :....................A = 115.6000 Acres
Runoff Curve Number :.............CN = 78
Time of Concentration:...........Tc = 0.64
• Storm Type :....................... = II
Pond and swamp areas spread
throughout watershed ............... = 3.00 percent of A
3.4680 Acres
2. Frequency ........................yr = 100
3. Rainfall,P(24-hour) ..............in = 3.00
4. Initial abstraction, la............ = 0.5641
5. Compute la/P ....................... = 0.1880
6. Unit peak discharge, qu......csm/in = 430.07
• 7. Runoff,Q .........................in = 1.1288
REVISED MARCH 2006 Attachment 2.05.3(3)-1-42