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I I I I I I I I I I I I I I I I I I I CONSULTING ENGINEERS ~ SELLARDS & GRIGG. INC. Cottonwood Plaza . Lakewood, Colorado 80215 8745 WeB' 14th Avenue (303) 238-6411 Mr. Ben Urbonas Page Two Mr. Ben Urbonas Chief, Master Planning Program Urban Drainage and Flood Control District 2480 West 26th Avenue, Suite l56-B Denver, Colorado 80211 The attached report represents the most recent phase of 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. Re: Lakewood Gulch Master Plan S&G No. 78017-42 We have enjoyed working with you, Tom Goebel of Lakewood 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 a feasible solution to the flooding potential along Lakewood Gulch. Dear Mr. Urbonas: Presented with this letter is the Major Drainageway Planning Phase B report ~or Lakewood Gulch in Jefferson County, Lakewood and Denver. Th1s report completes the agreement between Jefferson County, the Cities of Lakewood and Denver and the Urban Drainage and Flood Control District, dated June 23, 1978. The planning. for Lakewood Gulch has consisted of four phases of work. The f1rst phase was the preparation of a report entitled "Phase A, Preliminary Report on Major Drainageway Planning on Lakewood and McIntyre Gulches," which was completed in December 1975 and r7vised in Jan~ary, 1976. This report was prepared bY' McCall-El11ngson & Morr1ll, Inc. Consulting Engineers and summarized hydrologic, hydraulic, and economic evaluations of several alternatives which would reduce or eliminate existing drainage problems within the Lakewood and McIntyre Gulch basins. The second phase of the planning process for Lakewood Gulch resulted in the pub~ication of "Flood Hazard Area Delineation, Lakewood Gulch," wh1ch was prepared by Sellards & Grigg, Inc. and completed in February, 1979. This report illustrated the areas along the Lakewood Gulch channel which would be inundated by a 100-year flood. 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 conclusions presented herein, please feel free to contact us. Very truly yours, SELLARDS & GRIGG, INC. }'w~. ~ John M. Hamilton, P.E. t:r~rd~: ~S~l' PE-LS JMH:GEH:lb encl. The third phase of the Master Plan for Lakewood Gulch was the completion of an Addendum to the "Phase A" report described earlier. This Addendum was prepared by Sellards & Grigg, Inc. and published in March, 1979. The impetus for the Addendum was the constru~tion of a Satellite Maintenance Facility by the Denver Pub11c Works Department immediately adjacent to Lakewood Gulch near Decatur Street. New hydraulic and economic evalua- tions were made in a small reach of Lakewood Gulch extending from the South Platte River to Federal Boulevard. These evalua- tions supersede those published earlier in the "Phase A" report. .