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<br />002~S4 <br /> <br />REDUCING FLOOD LOSSES <br /> <br />7 <br /> <br />5-140 <br /> <br />"f'r,'). <br />~~~]~ <br /> <br />Subdivision ordi.nances usually' make no precise distinc- <br /> <br />. tion between 'f100ding and drainilge problem, eithet o!which can <br /> <br />result in water and erosion damage. Nevertheless, the terms <br />"flood" and "drainage" are often .used to apply to two some- <br /> <br />/ #" <br /> <br />what 'different situations: Flood areas ~re commonly areas <br />subject to overbank flows of rivers and. streams or coastal <br />waters where the depth, duration, and velocity of inundation <br /> <br />are substantial; drainage is used to refer to the problem <br />of disposing of surface runoff' from a single property or <br /> <br />several 'properties. <br />The pra.ctical difference between the subdivision ordinance <br />provisions applying to flooding and drainageis'in their <br /> <br />,npe!'~tj.0r.. ~ <br /> <br />(1) "Flood" areas are usually mapped and general <br />standards are provided to control development or for land <br /> <br />improvement. <br /> <br />(2) "Drainage" problems are not llIapped,but specific <br />drainage standards are made to apply to all la,nds..Ordinances <br />usually require that the adequacy of drainage plans for all, <br />subdivisions must be evaluated on a case-by-case basis. <br /> <br />Appendix <br />to drainage. <br />The discussion through. Part V focuses upon serious <br /> <br />E describes ordinance provisions pertaining <br /> <br />'''flood'' problems. Much of th..e material applies equally <br />to drainilge. <br />