OCR Text |
Show deliveries to the Alpine and Jordan Aqueduct systems. The flow under these conditions would amount to about one- third of the present channel capacity, with natural flow rights making up the bulk of the bypass at Deer Creek Reservoir. The bypasses at Olmsted Diversion would eliminate the existing dry channel problem. Below the power- plant tailrace, flows in the river would be essentially unchanged over historical conditions. Prior right diversions would be fully met and, at times, some bypass of water would be made to Utah Lake. Unit changes at this time of year would not be expected to significantly affect the existing fishery. Figure C- 12 shows that during the late irrigation season the flow between Deer Creek Reservoir and Murdock Diversion Dam ( 8.4 miles) would approximate 800 c. f. s. when peak demands would be met. This flow would be about double that which occurs under existing conditions. This substantial increase in flow would result from increased utilization of Provo River Project water and Bonneville Unit municipal and industrial deliveries to Alpine and Jordan Aqueducts. While this high flow would not exceed the channel capacity of approximately 1,500 c. f. s,, it would interfere with present use of the stream by fishermen and create an unnaturally high flow situation for fish. The natural pattern is for streamflows to decline during this time of year. The cessation of present power diversions and irrigation deliveries to the lower Provo River would cause much more water to be in the 1- mile section of stream from Murdock Dam down to the Olmsted Tailrace. Beyond this point the flow down to Utah Lake would be comparable to that which presently occurs. The operation of Bonneville Unit would not significantly alter the existing flow pattern and undesirable minimum flows which are extremely detrimental to fish production would continue to occur. In summary, the operation of the Bonneville Unit would reduce the quality of the 5- mile- long Class I trout fishery immediately below Deer Creek Dam. Flows in the 4- mile section of Class IV stream would be substantially increased thus eliminating a situation of near complete dewatering. Flows during the irrigation season would be considerably higher than at present but would not exceed channel capacity. These higher flows would be expected to |