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<br />1 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br /> <br />SECTION II <br />HYDROLOGY <br /> <br />INTRODUCTION <br />The present and future flow regime of the South Platte River at Union <br />Avenue in Englewood, Colorado, is one of the most important design <br />consideration for the proposed Union A venue boating by-pass facility. <br /> <br />Periods of low flow, less than 50 cfs, in the river represent time when <br />boating is impractical. Periods of excessive flow (above 1500 cfs for <br />recreational boaters) represent times when the river should only be used by <br />very experienced boaters. <br /> <br />The City of Englewood municipal diversions during the summer of 40 to 45 <br />cfs require the first 100 cfs of river flow for diversion and flushing of <br />sediment. This further constrains South Platte River boating potential and <br />water available for flow by-pass through the proposed Union Avenue boat <br />chute. Englewood passes the flushing water of 55 to 60 cfs back to the <br />river. It is available for sustaining boating downstream of Union Avenue. <br /> <br />Our analysis of the present and future flow regime is presented in this <br />chapter coupled with a statistical presentation for consideration by the <br />Colorado Water Conservation Board (CWCB), boating public, and public and <br />private agencies and foundations. <br /> <br /> <br />DRAINAGE BASIN <br />The South Platte River drainage basin at the Littleton gage includes <br />approximately 4,850 square miles extending from the Continental Divide in <br />the Rocky Mountain Range to the high plains and foothills of eastern <br /> <br /> <br /> <br />u <br />z <br />~ <br /> <br />t <br />UI <br />UI <br />z <br />5 <br />z <br />UI <br />m <br />~ <br />~ <br />~ <br />CI <br />~ <br />IE <br /> <br />