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I I I I I I I I I I I I I I I I I I I 23 VII THE DRY GULCH ~~STER PLAN lO-year and lesser floods would not occur after the improvements. This results in a significant decrease in flooding damage on an annual basis, as illustrated in Table VI-6. Presented in this Section is a set of l8 drawings illustrating the proposed Master Plan for development in the Dry Gulch Basin. The plan proposes facilities along the channels of Dry Gulch and its only major tributary, North Dry Gulch. The flood plain as delineated in "Flood Hazard Area Delineation, Dry Gulch and Tributaries," (Reference 1 ) should be zoned and regulated in accordance with the flood plain ordinances of the Cities. As the proposed Master Plan facilities are construc- ted, the lOO-year flood plain will change, and enforcement should similarly change. When all of the proposed facilities have been completed, several residential, commercial, and industrial struc- tures in the City of Lakewood will still lie within the "residual lOO-year flood plain. These facilities will have their average annual flood damages greatly reduced, and will be subject to a lesser hazard in a lOO-year flood, but damage will still be sustained in Borne 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. Owners of structures which are presently in the flood plain are encouraged to acquire flood insurance. The first sheet of the plans is a general layout of the sheets depicting the Dry Gulch Master Plan. The second sheet illus- trates the hydrOlogic sub-basins and basin boundaries used to develop flow rates during the investigated flood events. Sheets 3 through l8 illustrate the proposed improvements. Facing each of these sheets are a description of the important elements of the proposed improvements on that sheet and a detailed cost estimate of the facilities. General Comments The plan and profile sheets in this Section present facilities sized to convey, in general, the lO-year flood, either below ground in pipes or contained within open channels. In specific instances where larger facilities are proposed, they are des- cribed in the text. The sheets illustrate the extent of flooding in a lOO-year flood for both existing channel conditions and for improved channel conditions. While in many areas the lOO-year flood limit appears to be moved relatively little, flooding from Basis of Design Several basic design criteria were used in the develooment of this Master Plan, and are presented below in outlined form.