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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 <br /> <br />10. Prepare preliminary layout of selected alternative. <br /> <br />11. Prepare a written report discussing all items examined in the study. <br /> <br />12. Provide the Town with technical assistance interpreting the results. <br /> <br />Summary of Data Obtained <br />Listed below is the information collected for use in this study: <br /> <br />1. "Precipitation - Frequency Atlas of the Western United States, Volume III <br />- Colorado", Nati onal Oceani c and Atmospheric Admi ni strati on, 1973. <br /> <br />2. "Soil Survey of Crowley County, Colorado" by the U. S. Department of <br />Agriculture Soil Conservation Service, 1971. <br /> <br />3. "Procedure for Detennining Peak Flows in Colorado", U. S. Department of <br />Agriculture, Soil Conservation Service. <br /> <br />4. "Stormwater Nanagement Model", U.S. Environmental Protection Agency, as <br />modified by the Urban Drainage and Flood Control District. <br /> <br />5. "Storm Drainage Criteria Hanual", prepared by the Urban Drainage and <br />Flood Control Di strict. <br /> <br />6. "Flood Hazard Boundary Hap", Town of Ordway, Colorado, 1976. <br /> <br />7. "Draft Street and Storm Drainage Criteria Manual", dated 1986. <br /> <br />Mapping and Surveying <br />Aerial mapping (1" = 200') for the study area was provided by the Town of <br />Ordl'lay. The mapping is based on an aerial photograph made by Kucera Aerial <br />Mapping in 1976. The Town of Ordway also provided plat and utility data. The <br />U. S. Geological Survey quadrangle maps (1" = 2,000' with ten-foot contour <br />intervals) of Sugar City, Ordway, Nero Hill, and lake Henry, Colorado, liere <br />used in the delineation of major drainage basins. Streets and other existing <br />hydraulic structures were field surveyed by Abel Engineering Professionals, <br />Inc., in September through November, 1986, in order to supplement the aerial <br />mapping, and to facilitate the preparation of a 1" to 200' drainage plan of <br />the Town. <br />