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I I I I I I I I I I I I I I I I I I I 25 VII THE LAKEWOOD GULCH MASTER PLAN The flood plain as delineated in "Flood Hazard Area Delinea- tion, Lakewood Gulch," (Reference 7) should be zoned and regulated in accordance with the flood plain ordinances of the Cities. Owners of structures which are presently in the flood plain should be encouraged to acquire flood insurance. As the proposed Master Plan facilities are constructed, the 100-year flood plain will change. When all of the proposed facilities have been completed, several residential, commercial, and industrial structures in the City of Lakewood and the City of Denver will still lie within the "residual" 100-year flood plain. These facilities will have their average annual flood damages reduced, and will be subject to a lesser hazard in a 100-year flood, but damage will still be sustained in some instances. The owners of these structures can be alerted, by way of these reports, to the present and future hazards, and can prepare flood proofing and redevelopment plans accordingly. Presented in this Section is a set of 22 drawings illustrating the proposed Master Plan for development in the Lakewood Gulch Basin. The first sheet of the plans is a general layout of the sheets which depict the Lakewood Gulch Master Plan. The second sheet illustrates the hydrologic sub-basins and basin boundaries used to develop flow rates during the investigated flood events. Sheets 3 through 33 illustrate the proposed improvements. Facing each of these sheets are a general description and a cost estimate of the proposed improvements on that sheet. General Comments The plan and profile sheets in this Section present facilities sized to convey, in general, the lOO-year flood within open channels. In specific instances, facilities which would have lesser capacities are proposed; such facilities are described in the text. The sheets illustrate the 100-year flood plain for both existing channel conditions and for improved channel conditions. The majority of the improvements recommended would prevent flooding during a 100-year runoff. No flooding would be expected to occur during a 10-year runoff. This results in a significant decrease in flooding damage on an annual basis, as illustrated in Table VI-I. The Master Plan for Lakewood Gulch recommends that improvements be constructed in two separate construction phases. Replace- ment of insufficiently sized bridges and culverts, improvements to reduce erosion and flooding, improvement of channels in certain specified reaches and the acquisition of easements for maintenance access would constitute the first construction phase. Widening the natural channel and providing four to one grassed sides lopes , a low flow concrete channel, and a