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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />... <br />.. <br /> <br /> <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />SCOPE <br /> <br />UDFCD executed an agreement with Taggart Engineering Associates, Inc. (TEA) to <br />conduct an initial West Valley hydrology study of South Boulder Creek spills <br />downstream of Highway 36 to the area of the Wellman Ditch. <br /> <br />Specific tasks include: <br /> <br />. Request and review hydrologic modeling data by the Corps, <br />. Validate or modify the model with respect to the Viele Channel, Dry Creek <br />Ditch No, 2, and the West Valley Overflow. <br />. Conduct a field reconnaissance to identify hydraulic control structures and <br />conveyance characteristics along combined overflow and local drainage <br />routes. <br />. Prepare an initial hydrology model of the West Valley Overflow area from <br />Highway 36 to the Wellman Ditch and link this model to the Corps' model. <br />. Approximate hydraulics for flow splits and conveyances. <br />. Prepare a brief report with schematic maps describing the overall effort. <br /> <br />DATA OBTAINED AND REVIEWED <br /> <br />The data obtained for the Phase II effort included: <br /> <br />. Selected pages from Corps' reports on Boulder and South Boulder Creeks <br />hydrology. <br />. Corps' worksheets showing development of design rainfall hyetographs. <br />. Corps' SWMM sensitivity results for the Boulder Creek Study. <br />. Corps' parameter worksheets (area, lengths, and rainfall), <br />. SWMM executable file (the Corps' model used the EPA version of SWMM). <br />. As built information on some drainage structures, <br />. City electronic and hard copy topographic and features maps including the <br />entire tributary area (except Bear Canyon Creek) from the confluence with <br />Boulder Creek to the hog backs. <br /> <br />Studies and plans included: <br /> <br />. City of Boulder Storm Water Collection Svstem Master Plan, WRC, December <br />1984. <br />. City of Boulder Big Dry Creek Ditch II Preliminarv Desi9n Recort, MWE, <br />February 1996. <br />. 55th Street Improvements Baseline Road to Aracahoe Avenue Plans, Carter <br />Burgess, June 1996, <br /> <br />1-2 <br />