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III-8 The 3rd Avenue dam was given special attention because a boat chute was add- ed this year. This boat chute significantly increased the capacity of the dam to pass flood flows. Calculations of the flow of the dam were done in order to establish a rating curve to be used in the HEC-2 model. Flow was calculated over the section of the existing dam which will remain in place, over the boat chute recently constructed and over the spillway connecting the two. The rating curve was established at a section about 200 feet up- stream of the boat chute beyond the acceleration effect of the dam. The energy grade line was calculated at that point and at the crest of the exis- ting dam, the boat chute, and the side channel spillway. Using these calcu- lations, the flow split between the three overflow sections was determined. Calculations of low flow water surface elevations were obtained from McLaughlin Water Engineers, the designers of the boat chute. Avenue dam, drop structures at Sante Fe and Mississippi Avenues, the drop structure downstream of Florida Avenue and the dam upstream of Florida Ave- nue used to divert water by the Denver Parks Department. The Public Service Company danl uownstrearn of 13th Street is an inflatable dam. The dam would be in its collapsed position in time of flood. The collapsed elevation of the dam was assumed to be 1 foot above the concrete facility upon which the dam rests. 1. DENVER Clear Ck..__'''.. 'I --H--H-S~~rCre~k ..~. ReserVOir . .~o, Ck... /---------- ~... Cherry -.?--- - ~ , Creek -----... . Reservoir Chatfield Reservoir \ ..'~h~~I." ~ / Strontia,f / Springs Reservoir E levenmile H. Canyon ..' "-V 10 0 III- .-_-_-",J 10 20 30 40 . 50 I Scale in Miles FIGURE m-I SOUTH PLATTE RIVER BASIN MAP WRIGHT WATER ENGINEERS, INC. 2490 W. 26TH AVE.-SUITE 55A DENVER. COLORADO 80211