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HENSON CREEK FLOOD CONTROL IMPROVEMENT PRELIMINARY DESIGN INFORMATION PART I PURPOSE AND SCOPE IntroductiOl. This submittal includes the preliminary design and supporting information for construction of a flood protection berm on Henson Creek In Lake City. Included in this submittal are: 1. A narrative report describing the existing situation and design criteria and data (Part II). 2. Hydrologic and hydraulic data fran the recently completed F load Plain Report for Lake City (Part Ill). 3. A preliminary design consisting of profiles, cross-sections, and estimated quantities and costs (Part IV). 4. General construction specifications for the project, (Part V). Location. The project will consist of Installing flood protection berms (levees) on Henson Creek, fran the Gunnison Avenue Bridge approx imately 800 feet upstream to a point where Henson Creek emerges fran a narrow, steep- walled canyon. The proj ect wi Il be entirely within the Town limits of Lake City. Need for Project. The purpose of the project will be to prevent Henson Creek fran over-topping its banks or eroding stream channels in the project reach during floods exceeding the 100 year flow_ With the completion of this proj ect, all portions of both Henson Creek and Lake Fork of the Gunnison channels within the Town of Lake City will have flood protection berms sufficient to prevent damage during the 100 year flows. Authorization_ This preliminary report and design has been authorized by the Town of Lake City with support fran the Colorado Water Conservation Board. Application of Design Information. Due to the limited field Information available, the alignment and cross-sections are approximate only. Informa- tion in this report is I imited to the fol lowing applications: 1.) developing a proj ect construction budget and 2.) as guidel ines for construction by Town and County crews, in conj unction with a field design by an Engineer. 1-1 -