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<br />. ~ 00 <br />, " <br /> <br />0.,.. ..... <br /> <br />. .,,'. '~".' ..' '. , <br /> <br />. <br /> <br />e <br /> <br />..-- ---- <br /> <br />Flow calculations for 100 year flood event - Drainage Area A10407A <br />(HCFCD) <br /> <br />The following calculations show the increase of flow from a 100 <br />year flood event in the HCFCD ditch A10407 caused by the <br />development of a proposed landfill in laPorte, Texas. <br /> <br />Drainage Area A10407A = 1604.2 acres <br />Q100 (for 100% developed land) = 2800 cfs (refer to area <br />discharge curve) <br />0100 (for 0% developed land) = 1110 cfs <br />Proposed landfill - 80 acres (presently undeveloped) <br /> <br />In order to be conservative it was assumed that the 80 acres to .. <br />be used for a landfill was the only undeveloped land in area <br />A10407A. <br /> <br />Before landfill: 80 acres undeveloped (95% developed) <br />Q100 = 0.95 (2800) + 0.05 (1110) = 2716 cfs <br /> <br />After landfill: (100% developed) <br />0100 = 2800 cfs <br /> <br />. ~""'.' 0 ." . <br /> <br />...... ... .' ..... . ".0 ~" .". . ,; <br /> <br />. .... ." <br /> <br />...... . <br /> <br />. "'1' <br /> <br />" :.' ":'" : '\ .' .': .... r' 't, .' ....' ",Iff' .-/0,-,;91:1" , <br />