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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 />advised to contact the Urban Drainage and Flood Control District or the City of Arvada to <br /> <br /> <br />determine whether or not the information in this report has been amended, <br /> <br />II. AREA DESCRIPTION <br /> <br />Acknowledgements <br /> <br />The Moon Gulch Drainage Basin is located in Jefferson County within or northwest of the <br /> <br />City of Arvada. The studied basin is bounded by Ralston Creek to the south and Leyden <br /> <br />Creek to the north (Figure 1, Location Map). All three of these channels, among others, <br /> <br />combine into Ralston Creek. <br /> <br />The report was prepared by HDR Engineering, Inc., under contract with the Urban <br />Drainage and Flood Control District. <br /> <br />The survey control, aerial photography, topographic mapping, and the base plan and profile <br /> <br /> <br />sheets used in this report were prepared by Reids Aerial Mapping under a separate contract <br /> <br /> <br />with the Urban Drainage and Flood Control District. <br /> <br />The headwaters of Moon Gulch are located along State Highway 93 with the channel <br /> <br />, flowing eastward until its confluence with Ralston Creek. The study reach is a total of four <br /> <br />miles long with three miles located on Moon Gulch and one mile on Moon Gulch South. <br /> <br />The two Moon Gulch channels combine west of Quaker Street. <br /> <br />Although roads and small commercial and industrial development exist in the 2.71 square <br /> <br />miles of the Moon Gulch basin, the predominant land use is residential. The existing basin <br /> <br />currently has substantial residential development at the upper and lower ends with the <br /> <br />center section mostly undeveloped. Future planning indicates the undeveloped areas will , <br /> <br />primarily be residential developments. <br /> <br />The intermittent Moon Gulch channel primarily consists of wide grass-lined sections with <br /> <br /> <br />- relatively small rolvert crossings in the drainageway. These include three irrigation c~als <br /> <br /> <br />crossing the drainageway with the upstream (furthest west) being the Church Ditch at <br /> <br /> <br />Quaker Street, followed by the Farmers' Highline Canal, and the Croke Canarwhich are <br /> <br /> <br />directly west of Indiana Street. The drainageway also crosses Indiana Street as well as other <br /> <br />-3- <br /> <br />-4- <br />