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ACTIVITIES OF THE COLORADO WATER CONSERVATION BOARD DEPARTMENT OF NATURAL RESOURCES FOLLOWING THE FALL RIVER FLOOD OF JULY 15, 1982 Responsibilities The Colorado Water Conservation Board is the agency of the state government responsible for general water resources planning. The Flood Control and Floodplain Management Section of the Board has established several programs intended to develop floodplain information. Under the Flood Data Collection and Documentation Program, the Board has the authority to gather data and information looking toward the qreater utilization of the waters of the state and the prevention of floods, to make investigations and surveys, and to prepare written reports on the results of various studies for the use of any interested person. The following data and information has been or is presently being collected by the staff following the Lawn Lake dam break and subsequent flooding on the Roaring River, Fall River, and the Big Thompson River. Flood Water Surface Profile Field reconnaissance of flood high water marks and flood boundaries was made by staff on July 15 and 16, and a water surface profile of the flood has been drawn for the Biq Thompson River and Fall River from Lake Estes to the upstream town limits (approximately 3 miles). A flood profile for the 1-1/2 mile reach in Larimer County from the town limits to the Park boundary is also being prepared. The 10-, 50-, 100-, and 500-year flood profiles within the town of Estes Park are also shown for comparison. Flood Boundary Map Usinq the above profile, aerial photographs, and flood outlines verified in the field, the dam break flood has been drawn on detailed topographic maps (1" = lOa' and 2 foot contour interval). The maps were used to develop the Flood Insurance study for Estes Park and were flown in December, 1971 and extend from the park boundary to Lake Estes. The lOa-year and 500-year floodplains within the corporate limits of Estes Park will also be shown for comparison. Flood Discharge Profile The Board intends to prepare a discharge profile of the flood peak by setting up the computer model used in the Flood Insurance Study and finding the discharge(s) that best fits the flood profile and flood outline for Fall River.