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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />1 <br />I <br />I <br /> <br />21 <br /> <br />Boat Chute Discharge Design Criteria <br />Based upon the hydrological evaluation of the South Platte River at <br />Columbine Valley, the flood characteristics of the river, water rights <br />demands, boating needs, the Chatfield Reservoir release patterns, and a <br />1500 cfs maximum target limit for recreational boating, we have determined <br />that: <br /> <br />1. The design objectives for the boat chutes at Columbine Valley will be <br />based on a range of discharges from 100 cfs to 1500 cfs for average skilled <br />recreational boating use of the chutes; including rafts, canoes and kayaks. <br /> <br />2. A river discharge at Columbine Valley of from 50 to 100 cfs will be an <br />additional objective for use by recreational canoes and kayaks, but not <br />rafts. <br /> <br />3. A river discharge of from 1500 cfs to 3000 cfs is suitable only for <br />expert whitewater boaters, and such boaters may only use the boat chute <br />with an assumption of the risk. <br /> <br />4. For the optimum boat chute design discharge objective the selected <br />discharge is 500 cfs. This is based on the average May - September period <br />(1972 - 1984) discharge at the Littleton Gage of 500 cfs. <br /> <br />5. An evaluation of future dry year hydrological projections indicate that <br />when flows fall below 50 cfs at Columbine Valley, it will generally be <br />impractical for boaters to use the river. In that event, the river would <br />be impassible to all recreational boating. <br /> <br />6. The design engineer, CWCB and the U.S. Army Corps of Engineers, by <br />providing the boat chutes to improve navigability and to provide for river <br />