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<br />J.- <br /> <br />DCt1\Cl <br />('\)llll.ldll Sprlll~'" <br />PllIll'TlI\ <br /> <br />hl~'lllCL'llnF <br />f'I.IIHlI!l~' <br />SUI \\'\ 11li-= <br /> <br />JR EN(iINEERING. LTD. <br />6X."i7 S Sprun'Strel'( <br />Ent:'It'\\{)\lI,1. ('nll11 :ldp XOI1.::' <br />30.~-7~()-4.\93 <br /> <br />May 30, 1989 <br /> <br />Mr. Scott Hahn <br />Town Manager <br />Town of Erie <br />P . 0 . Box 100 <br />Erie, Colorado 80516 <br /> <br />Re: Preliminary Findings Report <br /> <br />Dear Scott: <br /> <br />JR Engineering is please to submit to you the Preliminary <br />Findings Report for the drainage design of the Town of Erie. <br />The drainage calculations and preliminary design presented <br />in this report are based on the Boulder County Storm <br />Drainage Criteria Manual. <br /> <br />This report shows that it is possible, with proper design <br />and construction measures, to construct a storm drainage <br />conveyance facility to transport minor storm runoff to Coal <br />Creek and alleviate many of the ponding areas throughout <br />the ~'own. <br /> <br />The report and accompanying plans show areas where streets <br />need to be lowered to allow adjacent properties and streets <br />to drain properly. The effect this could have on existing <br />utilities was not examined at this time and could affect <br />final design. The final design could also include a more <br />expansive storm sewer system if it becomes desirable to <br />provide positive drainage without lowering large sections <br />of roadway. <br /> <br />It should also be noted that the storm drainage design <br />presented herein does not provide for major storm <br />conveyance. Storm events greater than 10 year return <br />frequency will overtop Coal Creek causing flooding to the <br />east side of Town. A storm sewer system would be submerged <br />and useless until flood waters recede. It would not be <br />practical to design a system for flows greater than minor <br />storm levels. <br />