PERMFILE133929

• Permit No: C1981008A
• IBM Index Class Name: Permit File
• Doc Date: 3/25/2003
• Doc Name: Collection/Diversion Ditches and Culverts Design Parameters
• Section_Exhibit Name: NH2 Section 2.05.3‎(3)‎ Attachment 2.05.3‎(3)‎-1
• Media Type: D
• Archive: Yes

• DITCH C-13 BASIN 24
Time of Concentration (SCS Method)
Curve Number: 87
Length of Flow (ft): 2046.77
Average Land Slope Q: 4.6
Time of Concentration (hrs): 0.35
Graphical Peak Discharge
Project: AMENDMENT By: GL
Location: DITCH C-13 Checked:
Developed
1. Data:
Drainage area :....................A = 22.3000 Acres
Runoff Curve Number :.............CN = 87
• Time of Concentration:...........Tc = 0.35
08/09/1999
Date: 08/07/99
Date:
Pond and swamp areas spread throughout watershed. = 5.00 percent of A
1.1150 Acres
2. Frequency .................. ......yr = 10
3. Rainfall,P(24-hour) .... ..........in = 2.00
4. Initial abstraction, la... ......... = 0.2989
5. Compute la/P ............. .......... = 0.1494
6. Unit peak discharge, qu......csm/in = 613.82
7. Runoff,Q .........................in = 0.9056
8. Pond & swap adjustment factor,...Fp = 0.75
9. Peak Discharge,gp ...............cfs = 14.5273
• (REVISED(430-02) Attachment 2.05.3(3)-1- 20