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<br />/" <br /> <br />the San Juan River was studied using the Log Pearson II I frequency <br /> <br />Distribution as outlined in National Water Resource Council Bulletin No. <br /> <br />17. <br /> <br />There are no streamgages located on the McCabe. Creek segment of the <br /> <br />study. The characteristics of this drainage are significantly different <br /> <br />from the main stem of the San Juan, therefore a synthetic hydrograph <br /> <br />procedure was used to develop peak discharge values. More detailed <br /> <br />information on these procedures follow. <br /> <br />Analysis of Streamflow Records <br /> <br />(San Juan River Segment) <br /> <br />Peak discharge - frequency data for the main stem of San Juan River was <br /> <br />developed from the statistical analysis of streamflow records. United <br /> <br />States Water Resources Council Guidelines for Determining Flood Flow <br /> <br />Frequencies, Bulletin No. 17, was used as a primary reference. The <br /> <br />Colorado '''atf>r Conservation Board Technical Manual No. I was also referred <br /> <br />to; however, table 8 values appeared somewhat high for 50,100, and 500 <br /> <br />year events with large drainage areas (3CO sq, mi .), and low for smaller <br /> <br />drainage areas (90 sq. mi.). <br /> <br />Deviations from procedures outlined in WRC Bulletin 17 include the <br /> <br />fo llowi ng; <br /> <br />, <br />"', <br /> <br />, <br />'"--- <br /> <br />r:..' <br />~ <br /> <br />I <br /> <br /> <br /> <br />. <br /> <br /> <br />:. <br /> <br />.; <br /> <br />~..- <br />... <br />~...~ . <br /> <br />