C153333 Feasibility Study - Laserfiche WebLink

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I I I I I I I I I I I I I I I I I I I V-l Chapter V This feasibility study is to evaluate repairs and re- habititation of four of the major components of the Beaver Park irrigation system, Theae components are the diversion dam, the upper canal from the aqueduct to Brush Hollow Res- ervoir, the outlet facility of Brush Hollow Dam, and the first 4,000 feet of the lowe~ canal from Brush Hollow Dam to Third Street, The problems ~nd recommended repairs and/or modifications to each of theae components will be discussed in the order listed. L Diversion Dam The Beaver Park diversion dam is located across Bever Creek, lt miles upstream of ~ighway 115, The dam consists of a rockfill embankment witn a concrete ogee section to pass excess streamflow. The ogee section is JO feet above the streambed on the downstream side. The section is 95 feet wide and is 6 feet beloW the top of the embankment, The calculated overflow capacity is 5,000 cfs, There is a tunnel through the concrete section 20 feet below the top,which is equipped with a cast-iron paddle gate with a J6 x 48 inch dimension, This outlet is used to sluice sand from the diversion pool and to lower the water level below the main diversion gate for repairs, The sluice gate leaks considerable amounts of water and requires packing with sand bags on the upstream side to seal it off. The diversion gate and aqueduct are located on the right abuttment of the dam. There were originally two diversion gates, but one has been sealed off, The present diversion gate is a 40 x 6J inch cast-iron rectangular slide gate, The inside opening of the gate has been reduced to JO inches high by J6 inches wide. The gate seat and concrete around it have been somewhat eroded and the gate leaks when shut, The stem of the gate is badly bent. On March 14, 1979, the interior of the diversion chamber was inspected and appears to be in good condition, There is a layer of hard-packed sand and gravel in the base of the