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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 />3) Rio Grande River water backflowing into storm sewer systems, <br />resulting in local flooding; <br /> <br />4) Lift stations that are old, inadequately-sized, and inoper- <br />able; and <br /> <br />5) Combined sanitary-storm sewer systems inadequate for storm <br />flows, resulting in overloads during rainy periods. <br /> <br />In addition to the general problems specified above, this report ad- <br /> <br />dresses the following specific concerns: <br /> <br />1) Ponding in and around the Alamosa Inn; <br /> <br />2) Flooding and ponding problems from Alamosa Inn to the inter- <br />section of Main Street and West Avenue; <br /> <br />3) Ponding problems in the sale barn area just west of Highway <br />285 south of 6th Street; <br /> <br />4) Guidelines for new development regarding drainage. <br /> <br />E. STUDY AUTHORIZATION <br /> <br />The City and County of Alamosa, Colorado authorized McCarty-Hurst and <br />Associates, and Muller Engineering Company, on February 4, 1981, to <br />complete this drainage plan study. The drainage plan presented here- <br />in is provided to the city and county for use in establishing an ade- <br />quate system of storm drainage to serve the present community and to <br />meet the needs of future development. <br /> <br />F. MAPPING <br /> <br />The City of Alamosa provided blueline copies of topographic base maps <br />at a scale of one inch to one-hundred feet, completed by MSM Consult- <br />ing Engineers of Denver, Colorado, in 1979. These maps are othophotos <br />with one-foot contour intervals and were used to assist in delineating <br />the drainage basins and flooding areas. The mapping did not cover the <br />entire study area. Portions of northeastern Alamosa, western Alamosa <br />County, and portions south of Alamosa were outside of the mapping <br /> <br />-6- <br />