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<br />prainage Cr HeT ia <br /> <br /> <br />Peak discharge for the Old Town were found using the <br /> <br /> <br />Rational Method as found in the Boulder County Storm Drainage <br /> <br /> <br />Criteria Manual. For purposes of this Preliminary Findings <br /> <br /> <br />report only the 2 year and 5 year storms were analyzed. Storms <br /> <br /> <br />of this frequency will create the greatest local drainage <br /> <br /> <br />problems and proposed storm sewers will be designed to <br /> <br /> <br />accommodate those flows. storms of greater magnitude will result <br /> <br /> <br />in floodinq potential from Coal Creek. 'Phis will be addressed in <br /> <br /> <br />the finished Preliminary Drainage Study. <br /> <br /> <br />Floodplain location and peak flow rates for Coal Creek were <br /> <br /> <br />obtained from the Flood Insurance Study for the Town of Erie, <br /> <br /> <br />Colorado and shown on the Floodway Flood Boundary and Floodway <br /> <br /> <br />Map prepared by the Federal Emergency Management Agency dated <br /> <br /> <br />September 1982. <br /> <br /> <br />The Preliminary Storm Sewer Design was completed using <br /> <br /> <br />UDSEWER computer modelling program developed by Dr. James C.Y. <br /> <br /> <br />Guo of the University of Colorado at Denver in cooperation with <br /> <br /> <br />the Urban Drainage and Flood Control District. This program will <br /> <br /> <br />calculate runoff at each inlet, route the flows through a storm <br /> <br /> <br />sewer network and provide suggested pipe sizes to convey flows. <br /> <br /> <br />All hydrologic and hydraulic calculations prepared for this <br /> <br /> <br />Preliminary Findings are included in the appendix. <br /> <br />0/2623 <br /> <br />-3- <br />