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<br />. <br /> <br />. <br /> <br />NOAA Atlas #2, Precipitation-Frequency Atlas of <br />the Western United States, Volume III, Colorado. <br /> <br />For gaged basins, both urban and rural, with at <br />least 20 years of systematic stream gaging records <br />(see Glossary), the hydroloqist should perform a <br />probability distribution analysis of the gage data. <br />The probability distribution analysis allows the <br />hydrologist to assign probabilities to different <br />flows. The analysis should use the log-pearson III <br />technique (see Glossary), and it should include a <br />regional skew coefficient (see Glossary) appropriate <br />to the region being studied. Acceptable procedures <br /> <br />, <br /> <br />Guidelines for Determining Flood Flow Frequency, <br />U.S. Water Resources Council, Bulletin #17A. <br />Statistical Methods in Hydrology, Leo R. Beard, <br />CW-151. <br /> <br /> <br />. <br /> <br />are: <br /> <br />. <br /> <br />c) Hydraulic Determination <br /> <br />When the topographic shape of the stream channel and <br />adjacent lands in the valley has been adequately <br />represented by cross-sections, and when the flow <br />rates and volumes have been determined, the next <br />. step is a hydraulic analysis. This analysis will <br /> <br />-22- <br /> <br />