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Many people from the Denver metropolitan area as well as people from other Colorado locations and other states use the recreation facilities at Cherry Creek Lake. The total visitation during FY 1986 was 1,704,800 people. Recreation at and surrounding the reservoir is divided into two categories: general fishing and general recreation. General fishing is solely hook and line fishing. Activities included under general recreation include picnicking, sightseeing, swimming, camping, bicycling, hiking, jogging, horseback riding, nature studying, and dog training. There are soccer fields, ball fields, a golf course, a model airplane field, and a shooting range. The reservoir also has hosted special events such as hydroplane races and concerts. The annual recreation benefits total $5,725,700. The annual flood control benefits and annual recreation benefits total $26,745,700. POPULATION SAFETY DEFINITIONS The densely populated study area prompted that data be collected to estimate the potential population at risk (PAR), threatened population (IP), and loss of life (LOL). PAR, TP, and LOL were estimated for the area downstream on Cherry Creek and the South Platte River and the area along Sand and Toll Gate Creeks. In the "Guidelines for Evaluating M.odifications of Existing Dams Related to Hydrologic Deficiencies," the following definitions were given for PAR and TP. PAR is defined as the number of people who would be inundated by a flood if they took no action to evacuate. IP is defined as the number of people still in the inundation area after warning is given when the flood arrives at their location. PAR and LOL were calculated for dam failure under existing conditions and are shown in table 11. 34