PERMFILE116419

• Permit No: C1981018
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Section_Exhibit Name: Illustration 02 through 06
• Media Type: D
• Archive: No

aj'otID,~4eCOrtd~avleliiah3nc. --- 4sFUs
SITE PREPARATION & DflAINAGE
srwuu~e.corenuc-ro~• REV. 1
e~sr ups crtr, us~ss STANDARD FORM
RUNOFF & SEDIMENT CALCULATIONS 9/80
SHT. 560E 12
DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME
AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS
PROJECT ~VE~TEILt-s 'rVEL~ i~E5E2AP0 ~n~wfE JOB NO. UC 34 !,
REFUStr AREA ~ 3 POND N0.
BY n• r^~'V~ DATE `~- Z~. 80 CHECKED BY DATE
6. Peak Rate of Discharge -Used to Design Emergency Spillway, Road Culverts and Interceptor Ditches
Drainage Area = I ~' ~ ~ Acres
e. (.
Hydraulic Length = 113 _ Feet -(L• 2c7 -q
Equivalent Drainage Area = 3"5.O Acres (Fig. 7 ; TP-1491
Average Watershed Slope = ~'~.2
Weighted Watershed Runoff Curve Number = ~i5 •9

A. Peak Rate of Discharge From Charts ES-1026, ES~1027, TP~149
Rainfall Frequency = I ~ Years Rainfall Depth = ~ '~ Inches
O71For ~`'~ RCN71 = 01ES 7021for s-reE~ slopes) x Slope Correction Factor IEx. 2.0)
23.0 x U.9fj = 2.44 cfs
021For. 9J RCN21= 42.0 x v.~~ _ 41.1E cfs
c c
Equivalent Discharge ~ /• ~ I cfs (Interpolate Oetvroen O1 and 021
Actual Drainage Area
Actual Peak Discharge =Equivalent Discharge x
Equivalent Drainage Araa
Actual Peak Discharge Z°) ) I x l I S. U 1= 13. (c cfs
~J }l O
Note: 0 and 0 above refer to runoff resulting from RCN's to nearest 5 (60, 65, 70, etc.)
I ftcompuied RCN ends in 0 or 5 160, 65, 70, etc.) , 02 and the next line will net
be needed. In this case, O1 runoff will be the evuivalent Discharge. Refer to
SCS-TP-149 and Engineering Field Manual, Chapter 2.
Type I Storm distribution ES-1026: Hawaii, Alaska coastal side of Sierra Nevada
and Cattade Mountains in California, Otegon and W ashington.
Typs II Storm distribution ES~7027: rest of United States, Puerto Rico, and
the Virgin Islands.
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10-80