Laserfiche WebLink
FORMULA," FOR CALCULATION OF A <br /> STORM DRAIN POND'S VOLUME <br /> BASIC RUNOFF COEFFICIENTS <br /> SURFACE COEFFICIENT <br /> POND or BASIN 1. 00 <br /> F'i+V11'vV ubw uii , uiie surtact; V.ytp <br /> BUILDING or ROOF 0.80 <br /> COMPACTED EARTH ( gravel ) . 0.75 <br /> LAWN or - LANDSCAPING - . 0.20 <br /> RUNOFF CALCULATED AT 3. 12" ( 0-26 ' ) ��oeR.-scvr✓a�F'� <br /> ( a 10-year , 48 - hour stormCD <br /> ) <br /> No. 32158 <br /> FORMULAS s��T <br /> f n <br /> 410 <br /> � � 1 <br /> GOA 40 <br /> POND BASIN = 2& x 1 . 00 x 0.26 = & 3/ 7 <br /> PAVING II ;-Z 49, &J4 x 0. 95 x 0.26 3--,1034 <br /> ROOF =_ aag0 x 0. 80 x 0.26 = i i z <br /> COMP. EARTH =_402. 61-1, x 0. 75 x 0.26 L4 70 <br /> LAWN & = .4 o x 0.20 x 0.26 _Z5 Z_ <br /> LANDSCAPE <br /> SUBTOTAL = sa= S <br /> THE NEEDED POND CAPACITY = SUBTOTAL X 2 <br /> VOLUME DETERMINED WITH NO ALLOWANCE FOR PERCOLATION . ) <br /> -e_ tVNPA 1D9AYING ,ZXe_.— _ _ SCHACK & COMPANY, INC. <br /> MANTr-CA I GA Professional Design Group <br /> 1025 Central Ave. P.O. Box 339 <br /> __ Tracy, CA 95378 <br />