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I I-e I' I I I I I I Ie I' I I I I I I I I PROJECT DESCRIPTION Purpose This study has been initiated to provide a master plan for control measures to minimize potential flood damage within the lower one third of the Slaughterhouse Gulch drainage basin. Study Area Description The Slaughterhouse Gulch Master Plan study area encompasses the lower three sub-basins of the Urban Drainage and Flood Control District (U.D.F.C.D.) Basin 1-05-5700-01 (Fig. 1. Interim Report). The study reach extends from the confluence with the South Platte River to Powers Park, on the main tributary, and from Windermere Street to the corner of Datura Street and Littleton Boulevard, on the south tributary. Although the basin extends eastward into Arapahoe County, the study area is located entirely within Littleton. The study area contains 0.71 square miles of the total basin area of 2.02 square miles. A detailed physiographic and geographic description may be found on Pages 3 through 5 of the Interim Report. Development Status Development within the total basin encompasses about 90 percent of the available land. Land uses include light industrial and commercial in the lower reaches, and residential and commercial in the middle and upper reaches. The Interim Report states: "... . with the present degree of development, the basin has a high potential for flood damage. The channel ability to convey flood flows is very limited and restricted in certain areas. Severe encroachment has been made into the flood conveyance system at numerous places within the basin." "In the improved reaches, the major flood conveyance system is essent- ially the streets. Low flows are accommodated with in-place storm sewer systems. The improved properties adjoining the streets are susceptible to flooding from the major storm events. These properties accommodate single-family residences along Berry Circle and multi- family residences, offices and light commercial along Windermere and L ittl eton Boulevard."