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"~I I I I '. CONSULTING ENGINEERS ~ SELLARDS & GRIGG. INC. Cottonwood Plaza . Lakewood, Colorado 80215 8745 West 14th Avenue (303) 238-6411 Mr. Ben Urbonas Page 2 July ll, 1979 July ll, 1979 The Master Plan for Dry Gulch recommends that natural channels in relatively unobstructed areas be maintained or redeveloped in a manner to convey the lOO-year flood. In areas where urban- ization has severely restricted or obliterated the natural channels, storm sewer facilities to convey the lO-year flood are proposed. It is estimated that the development of the entire Master Plan would cost $ll,884,000, based upon 1979 prices. I I . . I '. . I I . . . I . Mr. Ben Urbonas Chief, Master Planning Urban Drainage and Flood Control District Suite l56-B 2480 West 26th Avenue Denver, Colorado 802ll Re: Dry Gulch Master Plan S&G No. 76046-42 We have enjoyed working with you as well as Tom Goebel and Tony Lea of Lakewood and Nick Skifalides and Joe Barsoom of Denver. We feel that the input of these and other individuals noted in the report has resulted in the preparation of a Master Plan which represents an economically feasible solution to the fre- quent and serious flooding which occurs annually along Dry Gulch and North Dry Gulch. Dear Mr. Urbonas: We have submitted to the Urban Drainage and Flood Control District considerable additional information and computations performed in the preparation of this report. If the report leads to new questions or concepts, or if we can be of further assistance in refining or interpreting statements or conculsions presented herein, please feel free to contact us. Presented with this letter is the Major Drainageway Planning Phase B Report for Dry Gulch in Lakewood and Denver. This report completes the agreement between Sellards & Grigg, Inc. and the Cities of Lakewood and Denver and the Urban Drainage and Flood Control District, dated February l4, 1977. Very truly yours, SELLARDS & GRIGG, INC. ttv~. ~ ~hn M. Hamilton, P.E. The planning for Dry Gulch and North Dry Gulch has consisted of three separate phases of work. The first phase was the prepar- ation of a "Flood Hazard Area Delineation, Dry Gulch and Tribu- taries," which was completed in November, 1977. This report illustrated the areas along the major channels which would be inundated by a lOO-year flood. JMH:lb enc 1. The second phase of the planning process was culminated by the preparation of "Major Drainageway Planning for Dry Gulch, Phase A, Development of Alternative Plans," which was published in December, 1977. This Report presented a number of different master plans for the purpose of reducing flood damages and hazards and costs of continued maintenance. The various alter- natives were evaluated by the Cities and the District, and a single master plan was selected. On May 30, 1978, the Cities and the District directed Sellards & Grigg, Inc. to proceed with the preparation of "Dry Gulch Major Drainageway Planning, Phase B Report." The attached report presents the detailed Master Plan, with estimated costs of design, land acquisition, and construction. The report also projects the reduction in flood damages which can be expected to result from the construction of the proposed facilities. This analysis indicates that the benefits would exceed the costs by a ratio of l.51.