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<br />, <br />, <br /> <br />from lots. streets and protection along smaller streams and tributary <br />areas within urban areas as contrasted with flood control required because <br />of overflow of larger streams onto adjacent lands. <br /> <br />Storm Drainage Systems <br />Management of urban storm drainage consists of the programs required <br />to reduce, to a socially acceptable level, the disruption of man's <br />activities caused by stormwater runoff. Urban drainage management systems <br />can include both physical works and management measures. The ,traditional <br />works that have been used to collect. transport and dispose of storm <br />drainage are quite expensive and construction frequently results in <br />temporary major disruption of services'within the area. <br />The physical system begins at the site where the stonnwater originates. <br />and terminates at the "disposal" point; the location where stormwater is <br />no longer of social concern. Storm drainage systems can be considered to <br />consist of two conceptual components, One component is designed to <br />prevent the disruption of the normal social and economic activities <br />during relatively frequent storm events, This portion of the system, <br />which has been tetllled "the initial drainage" (2), conforms to the usual <br />notion of storm drainage works. It is also referred to as the storm <br />sewer system, cUl'b and gutter system, convenience system and simply <br />drainage system. These systems can rarely be economically designed to <br />handle the infrequent events because of their high construction cost. <br /> <br />4 <br />