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I I I I I I I I I I I I I I I I I Developrr,ent on the north bank consIsts of 4 or 5 nouses built imf!1ediately behind the road. about 50 - 60 fee:. f,om tne bank. On the souch bank c recreallona] venlcle pan, lias been constructee on a bench immediately adjacent to the bank. There have been no previous efforts to construct flood protection berms on the south side. B. Design Criteria. The desIgn criteria to be used for construction of flood control berms. as prov ided by the Colorado Water Conservation Board. are as follows: 1. Freeboard above 100 year water surface level. a. 100 feet upstream fran Gunnison Avenue Bridge - 4 ft. freeboard b. Remainder of levee system - 3 ft. freeboard 2. Construction of levee. a. Top width - 8 ft. b. Side slopes - 1 on 3 for grass cover and 1 on 1 for rock riprap c. No decrease in channel conveyance for the existinq channel. C. Design Data. Information on 100 year flood levels was obtained frOO! the Flood Plain Information Report. Lake Fork of the Gunnison and Henson Creek in Lake City. Colorado prepared by WestWater Engineering in October. 1985. Field survey information included the following: 1. A 1" = 200' topograph ic map with 5 foot contours prepared by Merrick and Canpany in 1977. 2. A profi Ie of the north and south banks and stream bed prepared by the Colorado Water Conservation Board in August. 1985. 3. A cross-section at station 3+00 prepared by the Colorado Water Conservation Board (scale 1" = 200'). (Not used in design.) 4. Photographs taken by WestWater Engineering personnel and Ken Charles. Hinsdale County Planner. D. Land Ownership. The enclosed plat and letter indicates ownership of land adjacent to the project site. It is recommended that right of way agreements be obtained frOO! all affected landowners. il II 11-2