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<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 />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Report Acquisition <br />Copies Of this report afe availalbe for public distribution, at a nomi- <br />nal fee, at the offices listed below. A Technical Addendum to this report <br />is also available for review at the SO:;lcrffices;howc'Ier, it has no tbeen <br />published in sufficient quantities for public distribution. The Technical <br />Addendum includes all pertinent data and calculations used in this report. <br /> <br />Department of Community Development <br />City of Montrose <br />433 South 1st Street <br />Montrose, COlorado 81401 <br /> <br />Colorado Water Conservation Board <br />823 State Centennial Building <br />1313 Sher~~n Street <br />Denver, COlorado 80203 <br /> <br />,2, <br /> <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 />I <br />I <br />I <br />I <br />I <br />I <br /> <br />EXECUTIVE SUMMARY <br /> <br />This report presents a plan to reduce flood da~~ge in the City of <br />~lontrose water sprvi ce area. TM; ~ area is affected by the fl cod flows <br /> <br />from Cedar Creek, Montrose Arroyo, and Dry Cedal' CreeL At the present <br />time, the culvert crossi~gs on Montrose Arroyo dre insufficient to pass <br />the IOO-year flow; consequently, during such an event, a considerable <br />amount of flow would be lost from the Channel to flow overland. This <br /> <br />shallow flooding would flow away from Montrose Arroyo west. and north- <br />west toward the Uncompahgre River, resulting in average annual damages <br />to residential and commercial areas in the amo~nt of $198,000. There <br /> <br />is also some overflow from Cedar Creek in Montrose due to insufficient <br /> <br />culvert capacity, which causes $24,000 in average annual damages. The <br />flood damages ca~sed by Dry Cedar Creek are estimated to be minimal. The <br />recorrroended Flood COlltrol Plan consists of improving ten culverts on Mont- <br />rose Arroyo, and one on Cedar Creek. This plan would eliminate structural <br />darMge from floods up to the lOO-year event. The economic eval~ation was <br /> <br />completed based on the following criteria: 73/Rr: intfOrest rate; project <br /> <br />life of 50-years; a~d 1980 dollar base. This economic analysis yields <br />benefit-cost ratios of 1.20 and 2.49 for MontrOSe Arroyo and Cedar Creek <br /> <br />respectively. <br /> <br />,3, <br />