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<br />STORM DRAINAGE AND URBAN <br />REGION FLOOD CONTROL PLANNINGa <br /> <br />by Darryl W. Davisb <br /> <br />INTRODUCTION <br /> <br />Stormwater within urban regions has generally been considered a <br />.conlnon enemy" so that the objective has been to dispose of the runoff <br />as quickly as possible, In the past, disposition of stormwater has <br />been by stormwater management systems that collect and convey the <br />stonnwater to some downstream location as rapidly as possible, The <br />major components of stonnwater management systems have consisted of <br /> <br />storm sewers, open and closed conveyance conduits and occasionally <br />detention storage and pumping facilities. The systems are expensive <br />and have performed well in some instances and poorly in others, It has <br />been reported (1)* that the investment in storm drains is three times <br />the investment in works to protect the flood plain and the annual <br />damages from fn~dequate storm drains may well exceed the damage <br />inflicted upon urban flood plains, <br />Formulation of stormwater management systems includes defining the <br />planning objectives, determining the rainfall runoff characteristics of <br />the area, selecting the performance criteria, developing and evaluating <br />alternatives, and designing the implementatio~ procedures. Storm <br /> <br />apresented at the, 21-25 October 1974, course on Urban Region Hater <br />Planning, held at the Board of Engineers for Rivers and Harbors, <br />Fort Belvoir, Virginia, <br /> <br />bChief, Planning Analysis Branch, The Hydrologic Engineering Center, <br />Davis, California <br />* <br />References are tabulated at the end of the paper. <br />