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

• DITCH C-5
Time of Concentration (SCS Method)
Curve Number: 85
Length of Flow (ft): 3679.09
Average Land Slope Q: 4.78
Time of Concentration (hrs): 0.58
08/07!1999
Graphical Peak Discharge
Project: AMENDMENT By: GL
Location: DITCH C-5 Checked:
Developed
1. Data:
• Drainage area :....................A = 168.1000 Acres
Runoff Curve Number :.............CN = 85
•
Time of Concentration:...........Tc = 0.58
08/07/1999
Date: 08/07/99
Date:
Pond and swamp areas spread throughout watershed = 5.00 percent of A
8.4050 Acres
2. Frequency ...................... ..yr = 10
3. Rainfall,P(24-hour) ......... .....in = 2.00
4. Initial abstraction, la........ .... = 0.3529
5. Compute la/P ................. ...... = 0.1765
6. Unit peak discharge, qu.. ....csm/in = 458.81
7. Runoff,Q .........................in = 0.7951
8. Pond & swap adjustment factor,...Fp = 0.72
9. Peak Discharge,gp ...............cfs = 68.9903
REVISED MARC}i 2006
Attachment 2.05.3(3)-1-15