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COMPUTATION (d:\mjulltslppnd4l) Job`number,:0754"01.'141 03 <br /> Project Lovelace Transfer Statipnpmputed MJU Date 21 5ep-93 <br /> Subject Retention pond checked. Date <br /> Task SizingStreet 1; of 4 <br /> . volume Required: <br /> V=2.0 CAR/12 acre feet (County Std,Section 3.46) <br /> C= Runoff coefficient(Co.Stds Table 3-1) <br /> A= Area (acres) <br /> R= Total Rainfall in inches for design storm <br /> 2.0 Factor of 2 used for storage requirement per county Std. <br /> C and A; Computations; C X A is used for differing surfaces of Station. <br /> Sector A C C X A <br /> Pond Basin 1.16 1.00 1.16 <br /> Paving 6.95 0.95 6.60 <br /> Roofs 3.00 0.80 2.40 <br /> Landscape 3.75 0.20 0.75 <br /> 14.86 10.91 <br /> R computation: (Zone 2; rural, 100yr,24 hour storm) <br /> 3.6 inches (.15 in/hr(See attached 100 yr IFD by County on page 3/3)X 24 hrs) <br /> REQUIRED VOLUME <br /> FACTOR CXA R /12 <br /> V= 2 10.91196 3.6 12 6_5 Acre-feet <br /> POND SIZING <br /> Design Assumptions <br /> Sideslopes 4 :1 <br /> Total Depth 8 ft(assume 13.5 ft(elev gw=25-15=10)to ground water and 5 ft separation to base (rim=23.0); <br /> this is based on County information for 1984,85, and 86) <br /> Width 202 ft(at rim) RIM 23 <br /> Freeboard 0.2 ft WATER ELEVATION 22.8 <br /> Length 250 ft <br /> Water top Water bot Area <br /> width 200.4 138.0 27,655 <br /> length 242.0 186.0 45,012 <br /> Rim 50,500 1.16 Acres <br /> Storage Volume 6_5 Acre-feet <br />