Laserfiche WebLink
33a=&- ft*'dEah nc 4 -SF -06 <br />suaPase[a - COnaT a SITE PREPARATION &DRAINAGE <br />4lT U[r CRT, UTAH STANDARD FORM REV. 1 <br />RUNOFF & SEDIMENT CALCULATIONS 9/80 <br />SHT. 5 O 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT EVE -5rnV0 FUG -u fh1je2s.no /AiuE JOB NO. L)G- 34G <br />SEt7 vnENTATia.+ ?[Pja Fo 17- PorCTAL POND NO. 09 1 <br />BY krv, �3'( DATE 10 - U - 60 CHECKED BY DATE <br />6. Peak Rate of Discharge - Used to Design Emergency Spillway, Road Culverts and Interceptor Ditches <br />Drainage Area = 44, 05 03 Acres <br />Hydraulic Length = 5,150 <br />Feet S2 207 A .& <br />Equivalent Drainage Area = 93.4r Acres 1 Fig. 7; TP -149) <br />Average Watershed Slope = `1.3.4 % 4 �o') _ 0,2344 <br />64.oi (aaSVe� <br />Weighted Watershed Runoff Curve Number <br />A. Peak Rate of Discharge From Charts ES -1026, ES -1027, TP -149 <br />Rainfall Frequency = 1 Years Rainfall Depth = I.8 Inches <br />01(For RCN7) = O(ES 102—for ST slopes) x Slope Correction Factor (Ex. 2.0) <br />= 38 x f . 08 = 41.Od cfs <br />0 2 ( For 9'5' RCN2) = � x 1 .08 _ — 11 .2S cfs <br />Equivalent Discharge = 4001(0 cfs (Interpolate Between Gland (22) <br />Actual Peak Discharge = Equivalent Discharge x Actual Drainage Area <br />Equivalent Drainage Area <br />Actual Peak Discharge (05.1(0 x ( 4.4 .03 I . 32.2 efs <br />93.4 <br />Note: O and O above refer to runoff resulting from RCN's to nearest 5 (60, 65, 70, etc.) <br />If computed RCN ends in 0 or 5 (60, 65, 70, etc.) , O and the next line will not <br />he needed. In this case, O runoff will be the equivalent Discharge. Refer to <br />SCS -TP -149 and Engineering Field Manual, Chapter 2. <br />Type I Storm distribution ES -1026: Hawaii, Alaska coastal side of Sierra Nevada <br />and Cascade Mountains in California, Oregon and Washington. <br />Type 11 Storm distribution ES -1027: rest of United States, Puerto Rico, and <br />the Virgin Islands. <br />• <br />Is <br />