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,'-... ':' .. Exhibit A SCOPE OF SERVICES As-Needed Engineering Services Program Crystal River Floodplain Delineation Study Colorado Water Conservation Board May 28, 2003 CONSULTANT For the purposes of this Scope of Services (Study), the consulting engineer shall be ICON Engineering, Inc. (Consultant), The Colorado Water Conservation Board (CWCB) is the Study Sponsor. The maximum State funding to be paid to the Consultant for this Study is $ ( _ Dollars)~ SUMMARY OF REQUESTED WORK The Consultant shall perform data collection; GPS field surveys, topographic map checking, hydrologic review, hydraulic analyses, report writing, digital map preparation and other tasks necessary to complete a floodplain delineation study on the Crystal River within Gunnison County, Colorado, AUTHORITY According to Section 37-60-106(1)(c) of the Colorado Revised Statutes, the Colorado Water Conservation Board has the power and duty: "... to devise and formulate methods, means and plans for bringing about the greater utilization of the waters of the state and the prevention of flood damages therefrom . . ." STUDY LOCATION AND DESCRIPTION The CWCB has been working in conjunction with Gunnison County officials to address floodplain mapping priorities within the County, and has identified the Crystal River as one of the top mapping priority areas. The study reach is the mainstem of the Crystal River with a downstream study limit located at Gurmison County Road 3 at the US Forest Service Boundary (downstream of the town of Marble). The upstream study limit is at the confluence with Lost Trail Creek (upstream of the town of Marble). The total study reach length has been estimated to be 4 to 4.5 miles. OBJECTIVE The Study objective is to develop a floodplain information report and floodplain maps to document the flood hazards for said study reach of the Crystal River. The professional services will include the following major tasks: . Research and data collection, . GPS field surveys to verify base topographic mapping and to obtain geometry of hydraulic structures (bridges/culverts) within the study reach. (Gunnison County has reported 4 bridges within the study reach.) . Hydrologic analyses using Flood Flow Frequency of existing streamflow gage records (Cyrstal River at Marble, Crystal River near Redstone, Crystal River above Avalanche Creek at Redstone) to generate peak discharges for the 10-, 50-, 100-, and 500-year flood frequencies along the study reach. . Detailed hydraulic analyses using HEC-RAS to compute 10-, 50-, 100- and 500-year flood profiles for the study reach. . Detailed hydraulic analyses using HEC-RAS to compute a I-foot rise floodway (using accepted methods) for the study reach . Delineation of the 100-year floodplain limits and the I-foot rise floodway for the study reach . Preparation of digital (GIS) floodplain maps for the study reach using FEMA's DFRIM Guidelines and Specifications. 1 ~ ?;;ti~