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