2016-08-24_PERMIT FILE - C1981008A ‎(4)‎

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 8/24/2016
• 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

Culvert 103
Time of Concentration (SCS Method)
Curve Number: 78
Length of Flow (ft): 7113.73
Average Land Slope (percent): 5.00
Time of Concentration (hrs): 1.21
Graphical Peak Discharge
Project: NUCLA MINE
By: GL Date: 02/20/06
Location: CULVERT 103
Checked: Date:
Present
1. Data:
Drainage area: .................... A
= 226.8000 Acres
Runoff Curve Number: .............
CN = 78
Time of Concentration: ...........
Tc = 1.21
Storm Type: ....................... =
II
Pond and swamp areas spread
throughout watershed ............... = 1.00 percent of A
2.2680 Acres
2. Frequency ........................yr = 10
3. Rainfall,P(24-hour).............. in = 2.00
4. Initial abstraction, Ia............ = 0.5641
5. Compute Ia/P....................... = 0.2821
6. Unit peak discharge, qu...... csm/in = 267.92
7. Runoff,Q.........................in = 0.4844
8. Pond & swap adjustment factor .... Fp = 0.87
9. Peak Discharge,gp...............cfs = 40.0117
Culvert 107
Peak flow of 10.7 cfs from Ditch D108. See Ditch design for details.
Attachment 2.05.3(3)-1 Page 36 June 2016 (TR -73)