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I I I I I I I I I I I I I I I I I I I 2 Flood plain boundaries may be subject to revision in the future due to road Boulevard. The total basin is approximately 2 miles long and about 0.8 miles wide. The average slope of the thalweg is approximately 1.5 percent. East of or bridge construction and other developments which are unknown at the time this report is prepared. Prior to utilizing this report, the user is advised to contact the Urban Drainage and Flood Control District or the Colorado Water Conservation Board to determine if the information in the report has been Sheridan Boulevard, about 60 percent of Weir Gulch is confined in pipes varying in size from 42 to 54 inches in diameter. Intermediate sections consist of poorly maintained open channels. From Sheridan Boulevard to a point approxi- amended. mate1y 300 feet east, a 34"x54" elliptical RCP pipe conveys storm runoff to the east. Approximately 600 feet west of Sheridan, a 24" corrugated metal pipe connects the open channel to tile west with a 34"x54" elliptical pipe. The drainageway is primarily open channel west to Jay Street. The floodplain is fully developed east of Sheridan Boulevard. Development within the floodplain west of Previous Investiqations The U.S. Army Engineer District, Omaha Corps of Engineers, Omaha, Nebraska, published "Flood Plain Information, Volume IV, Denver Metropolitan Region, Colorado", which included discussion of the Weir Gulch drainage basin in Sheridan Boulevard is limited to less than a dozen residences. October, 1 968. Dakota Avenue Tributary is in Denver east of Sheridan Boulevard and in Lakewood Frasier & Gingery, Inc., of Denver, Colorado, prepared "Major Drainageway Planning, Sanderson Gu1chlWeir Gulch", for the Urban Drainage and Flood Control District in August, 1972. west of Sheridan Boulevard. The basin is fully developed east of Sheridan Boulevard, and approximately 60 percent developed west of Sheridan.1 The basin is approximately 2 miles long and .25 miles wide. The average slope is approxi- Gingery Associates, Inc" of Englewood, Colorado prepared design drawings for mate1y 1.5 percent. The upper portion, west of Harlan, is less than average slope as contrasted with above average steepness for the reach east of Sheridan. A "Weir Gulch Drainage Improvements", in 1976 for the City and County of Denver and for the Urban Drainage and Flood Control District. storm drain system conveys runoff from Villa Ita1ia Shopping Center and dis- charges just east of Harlan Street, which is also the point of discharge for a DRAINAGE BASIN CHARACTERISTICS storm drainage system serving West Nevada Place. An open channel conveys the Two tributaries of Weir Gulch are the subject of this study; 1st Avenue and Dakota Avenue. 1st Avenue Tributary discharges into Weir Gulch near 1st Avenue and Raleigh Street. Dakota Avenue Tributary discharges into Weir Gulch where Dakota Avenue terminates at the west bank of Weir Gulch. flow to a 42-inch diameter pipe at Eaton Street. This pipe connects with an open channel east of Depew Street. The open channel continues to Sheridan Boulevard. From Sheridan Boulevard to the main stem of Weir Gulch, the drainage is carried in a conduit with diameters varying from 30 inches to 1st Avenue Tributary is in Denver between its point of discharge and Sheridan 36 inches. Boulevard. From Sheridan to approximately Wadsworth Boulevard, the City of The basin boundaries are shown on Sheet 1 of the drawings. Lakewood has municipal jurisdiction. The basin is fully developed east of Sheridan Boulevard and estimated to be 80 percent developed west of Sheridan 1The area west and south of Villa Italia is presently zoned agricultural, but commercial development is expected.