PERMFILE120020

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Collection Ditches, Culverts & Diversion Design Parameters
• Section_Exhibit Name: NH2 1996 Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-10 Part 7
• Media Type: D
• Archive: Yes

. CULVERT A-1 BASIN 1
Time of Concentration (SCS Method) 08/07/1999
Curve Number: 86
Length of Flow (ft): 2046.77
Average Land Slope (): 4.4
Time of Concentration (hrs): 0.37
08/07/1999
Graphical Peak Discharge
Project: AMENDMENT By: GL Date: 08/07/99
Location: CULVERT A-1 Checked: Date:
Developed
1. Data:
Drainage area :....................A = 41.9000 Acres
Runoff Curve Number :.............CN = 86
Time of Concentration:...........Tc = 0.37
• Pond and swamp areas spread throughout watershed = 5.00 percent of A
2.0950 Acres
2. Frequency ........................yr = 10
3. Rainfall,P(24-hour) ..............in = 2.00
4. Initial abstraction, la............ = 0.3256
5. Compute la/P ....................... = 0.1628
6. Unit peak discharge, qu......csm/in = 591.10
7. Runoff,Q .........................in = 0.8490
8. Pond & swap adjustment factor,...Fp = 0.75
9. Peak Discharge,gp ...............cfs = 24.6413
•
(Revised 12/00) Attachment 2.05.3(3) -10-85