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<br />RECOHNEl.','DATIO:<S Al:W CONCLUSIONS <br /> <br />. <br /> <br />The method used in this study is inexpensive and fast. It <br /> <br />. <br /> <br />could be used to map flood potential in large areas before urban <br /> <br />and sub-urbanization make land use planning irrelevant. In the <br /> <br />author's opinion, the simplicity of the method and the clarity <br /> <br />of the maps enhance its value J:O land use planning,. <br /> <br />The method proposed here permits the delineation of areas <br /> <br />susceptible to flooding with a fair amount of certainty, With a <br /> <br />minimum amount of hydrologic information it is >>oss~ble to ~ake <br /> <br />estimations of magnitude ;1nd frequency of flooding, In the eight <br /> <br />quadrangle Windsor area, areas of past flooding have been mapped <br /> <br />,and flood magnitudes and frequencies evaluated with the hope that <br /> <br />the information will be 'applied to sensible land use planning. <br /> <br />The method does have some important restrictions. It is <br /> <br />probab}y not applicable to humid climates where dense vegetation <br /> <br />'would obscure all flood evidence. The calculations of'discharge <br /> <br />are not 'meant for flood design" They can only give an estimate <br /> <br />of magnitude and frequency of flooding, <br /> <br />The areas mapped are not the only place liable to flooding. <br /> <br />Sites adjacent to susceptible areas may floo~ less frequently, <br /> <br />Nodifications of a basin may produce floods of a magnitude and <br />2 <br />extent never before experienced in that particular drainage, <br /> <br />. <br /> <br />2The change in rational equation runoff coefficients shows the <br />important effects of land use change. For example'; a change from" <br />grass on flat land (C=O.lO) to parkin&area (C=O,9) suggests an in- <br />crease in discharge by a factor of 9, The change from flat land >lith <br />prairie soil, cultivated but without crops (C=O,35) to single family <br />residential use (C=O.50) may increase the flood discharge by a factor <br />of 1.4. <br />