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PERMFILE120020
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Entry Properties
Last modified
8/24/2016 10:18:55 PM
Creation date
11/25/2007 8:10:12 AM
Metadata
Fields
Template:
DRMS Permit Index
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
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• 6) Collection Ditches and Diversion Designs <br />DITCH C-1 BASIN 4 <br />Time of Concentration (SCS Method) 08/07/1999 <br />Curve Number: 86 <br />Length of Flow (ft): 2260.64 <br />Average Land Slope Q: 14.0 <br />Time of Concentration (hrs): 0.22 <br />08/07/1999 <br />Graphical Peak Discharge <br />Project: AMENDMENT By: GL Date: 08/07/99 <br />Location: DITCH C-1 Checked: Date: <br />Developed <br />1. Data: <br />Drainage area :....................A = 23.3500 Acres <br />Runoff Curve Number :.............CN = 86 <br />Time of Concentration:...........Tc = 0.22 <br />Pond and swamp areas spread throughout watershed.. = 5.00 percent of A <br />1.1675 Acres <br />• 2. Frequency ........................yr = 10 <br />3. Rainfall,P(24-hour) ..............in = 2.00 <br />4. Initial abstraction, la............ = 0.3256 <br />5. Compute la/P ....................... = 0.1628 <br />6. Unit peak discharge, qu......csm/in = 741.10 <br />7. Runoff,Q .........................in = 0.8490 <br />8. Pond & swap adjustment factor,...Fp = 0.70 <br />9. Peak Discharge,gp ...............cfs = 16.0691 <br /> <br />(Revised 12/00) Attachment 2.05.3(3) -10-70 <br />
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