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I l5 I I I I 5. The master plan, when implemented, will result in flows up 7. Several notable exceptions to the ten-year facilities are to the ten-year flood passing through the entire lengths recommended. Larger facilities are advised to reduce of the channels without creating damage. A one-hundred flooding on Colfax Avenue, Wadsworth Boulevard and Kipling year flood plain (for flows exceeding the capacities of the Street in order to reduce the level of flooding in a one facilities) would be defined and regulated. It would thus hundred-year storm sufficiently to allow passage of I I I become gradually cleared and the damage potential would be emergency vehicles on those arterial streets. gradually reduced. After evaluation of the Phase A report, the Urban Drainage 6. It is recommended that the cities adopt a number of "select District and the Cities of Denver and Lakewood selected the plan structural improvements" in Reaches where open channels which should be used for the Major Drainageway Planning on Dry presently exist. These would include acquisition of right- I I I Gulch. In a statement dated May 30, 1978, the Clients estab- of-way of land traversed by the main channels, ,shaping of the lished the general guidelines for the master plan; this state- natural channel into a more stable configuration, where such ment is reproduced below: shaping is merited, construction of erosion control facili- ties, and development of access routes to allow maintenance vehicles to reach the channels. Note that these improve- DRY GULCH SELECTED PHASE B PLAN I I I I I ments would provide only minor tangible benefits in return General l. Recommend enforcement of flood plain regulations of the lOO-year flood plain. for their costs. As such, they can be assigned a lower priority than the other items of the Recommended Alternative. 2. Discuss in the plan the need for regulating the residual lOO-year flood plain for drainageway improvements designed to convey less than lOO-year. The actual steps of this measure could wait until owners of land containing the gulch propose development. At that time, 3. Any storm sewer inlets to be provided in conjunction with the recommended and/or selected improvements should be "Type R" as designated by the Colorado Department of Highways and should be designed using the Standard Curb- Opening Inlet Chart in the June, 1977 issue of "Flood Hazard News". they would be encouraged to develop the channel in con for- mance with the master plan, and to dedicate to the City right-of-way containing the channel. However, within this I I I report the total costs are shown; no attempt is made to 4. The plan should encourage purchase of flood insurance. divide the costs into public and private funding sources.