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I I I I I I I I I I I I I I I I I I I 1 I SUMMARY The Study Area The Lakewood Gulch watershed consists of approximately 16.0 square miles, lying predominantly in Lakewood. The Lakewood Gulch channel, subject of this study, meanders eastward between Colfax Avenue and West 6th Avenue, from Jefferson County at U.S. Highway 6 near the westerly boundary between Lakewood and Jefferson County. The channel is tributary to the South Platte River in the vicinity of Colfax Avenue in Denver. The Lakewood Gulch watershed is essentially fully developed in the City of Denver and in the easterly portiond the City of Lakewood; it is partially developed in the western portion of Lakewood and Jefferson County. Because of the relatively intense urbaniza- tion in some parts of the drainage basin, the storm runoff has increased over natural conditions and some residents along Lakewood Gulch have stated that flood damage and inconvenience have occurred. Presented in this report is a conceptual Master Plan for development of the Lakewood Gulch drainageway in the Cities of Lakewood, Denver, and the County of Jefferson. The studied channel reach is 8.41 miles long, of which 5.45 miles are in Lakewood, 2.34 miles are in Denver, and 0.62 miles are in Jefferson County. The Master Plan is presented by way of plan and profile sheets depicting the recommended improvements to the channel. The first of two construction phases is presented as the Master Plan with a detailed discussion of costs and benefits. In reaches where a second construction phase is recommended, a typical cross-section exhibits the limits of the improvements. A cost estimate for the second construction phase was prepared, where applicable, and shown following the estimate for the first construction phase, opposite each plan and profile sheet. The following paragraphs of this Section summarize the detailed information contained in the subsequent sections of this report. This presents a synopsis of the analyses performed and the elements of the recommendations. Hydrologic and Hydraulic Analyses Detailed analyses were made of the anticipated rainfall in the Lakewood Gulch watershed for the 2-, 5-, 10-, and 100-year rain- storms, and the limits of flooding which would result from the storms were determined. Development of Alternative Plans The report titled "Phase A Preliminary Report on Major Drainage- way Planning on Lakewood and McIntyre Gulches," (Reference 5)