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<br />drainage area size, precipitation, and stream slope, 2,) The prediction of statistical parameters such <br />as mean annual flows, standard deviations, and skew coetficients of annuai streamflows throughout <br />a large basin based on a host of physical and climatic factors, The use of simple and multiplE! linear <br />regression is frequently required to define the relationships, <br /> <br />Advantages <br /> <br />Disadvanta<;Jes <br /> <br />1, Technical process of development is <br />relatively straight forward, <br /> <br />1, Generally is incapable of incorporating <br />etfects of such different basin conditions as <br />rese/voir storage and other man-made <br />management works, <br /> <br />2, Once performed, results are available for <br />widespread use, <br /> <br />3, The reliability of the results can be <br />determined by formal statistical procedures, <br /> <br />2, Can be particularly unreliable in small <br />(especially urban) basins. <br /> <br />4, Results are easy to obtain from equations <br />and charts, <br /> <br />3, Has substantial potential for abuse in <br />applications due to ease in use. <br /> <br />6,1.4 Rational Method, The rational method is based on the assumption that a steady uniform rainfall <br />rate will produce the maximum runoff when all portions of the basin contribute to the outflow, <br /> <br />Advantaaes <br /> <br />Disadvantages <br /> <br />1, Simplicity, <br /> <br />1, Due to assumptions of homogeneity; <br />method is only valid for small area(<100 <br />acres), <br /> <br />2, Widely used, particularly for stormdrain <br />design, <br /> <br />3, Generally conservative, <br /> <br />2, Assumes rainfall intensity is constant during <br />storm duration, <br /> <br />3, Only detines peak discharge, <br /> <br />6.2.1 Envelooe Curves- Another means of estimation of flood potential for a particular region is based <br />on examination of the largest floods that have historically occurred in the nearby area or region, The <br />usual method is to develop an envelope curve or relationship between the maximum historic flood at <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />6.4 <br /> <br />DRAF[' <br />