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Storage Calculation <br /> Project: 29700 Ahern Road Job #19017 Date: 05/22/2019 <br /> Description: On-Site Swale Storage Calculations <br /> Runoff Coefficient (C) Calculation <br /> Landscape Area (sq.ft) 84546 C=0.20 (Lawns & Open Lands) <br /> Roof Area (sq.ft) 26626 C=0.80 (Roofs) <br /> Pave / Concrete (sq.ft) 302249 C=0.95 (Pavement & Concrete) <br /> Total Area (sq.ft) 413421 <br /> Composite C 0.79 <br /> Volume Calculation 24-Hour Duration <br /> V=CAR/12 100-Year Event <br /> Coefficient (C) 0.79 Composite Value <br /> Area in acres (A) 9.49 <br /> FS 2 <br /> Zone 3 Rural (in.) 1.39 <br /> Runoff (R) 2.78 <br /> Volume Req. (ac.ft.) 1.73 <br /> Volume Req. (cu.ft.) 75,372 <br /> GDR Engineering, Inc. Onsite Storage <br />