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Analysis of Colorado-Big Thompson Project Operation With Respect to East Slope Diversions and Non-Charge Deliveries
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Analysis of Colorado-Big Thompson Project Operation With Respect to East Slope Diversions and Non-Charge Deliveries
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Last modified
3/11/2013 4:58:00 PM
Creation date
3/6/2013 3:29:32 PM
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Water Supply Protection
Description
For the River Colorado Water Conservancy District
State
CO
Basin
South Platte
Colorado Mainstem
Water Division
1
Date
10/1/2000
Author
Helton & Williamsen, P.C.
Title
Analysis of Colorado-Big Thompson Project Operation with Respect to East Slope Diversions and Non-charge Deliveries
Water Supply Pro - Doc Type
Report/Study
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1 <br />J <br />1 <br />was constructed around the Flatiron Powerplant so that water could be delivered from the <br />penstocks below Pinewood Reservoir directly into Carter Lake, thus eliminating the dependency <br />on the pump /turbine unit. <br />In diverting water into the Olympus Tunnel, the USBR recognizes the following minimum <br />bypasses for fishery purposes at Olympus Dam: <br />Period <br />Bypass, cfs <br />November 1 -April 15 <br />25 <br />April 16 -30 <br />50 <br />May 1 -15 <br />100 <br />May 16- August 15 <br />125 <br />August 16 -31 <br />100 <br />September 1 -15 <br />75 <br />September 16- October 31 <br />50 <br />The USBR annual operating plans indicate that these bypass rates were recommended by the <br />Colorado Division of Wildlife and U.S. Fish and Wildlife Service. <br />Carter Lake provides for the storage and regulation of water to be delivered southward <br />to the Little Thompson River, St. Vrain Creek, Boulder Creek, and the South Platte River <br />through the St. Vrain Supply Canal, Boulder Creek Supply Canal, and South Platte Supply <br />Canal. It was constructed during 1950 -52 and has a total storage capacity of approximately <br />112,200 acre -feet at elevation 5,759 feet. Of this total storage capacity, approximately 108,900 <br />acre -feet is active storage. Water was first pumped to Carter Lake in February 1954 and first <br />delivered to the users in the summer of 1954. Water can also be released from Carter Lake to <br />generate power through the above - mentioned pump /turbine unit. <br />The Charles Hansen Feeder Canal extends northward from Flatiron Lake and transports <br />water to the Big Thompson River and Horsetooth Reservoir. The carrying capacity of this canal <br />is approximately 930 cfs above the Big Thompson River wasteway and approximately 550 cfs <br />below the wasteway. Project water is released from the Charles Hansen Feeder Canal to users <br />on the Big Thompson River through a combination of the Big Thompson Powerplant and a <br />wasteway on the canal, with both turnouts being located just upstream from a siphon across the <br />Big Thompson River. In addition, several water users obtain water directly from the Charles <br />Hansen Feeder Canal through turnouts located between the siphon across the Big Thompson <br />River and Horsetooth Reservoir. <br />The Dille Tunnel transports water diverted from the Big Thompson River at its diversion <br />facility situated about one mile upstream from the above - mentioned siphon to a location on the <br />Charles Hansen Feeder Canal just upstream from the Big Thompson Powerplant. The Dille <br />Tunnel and its diversion structure were constructed during 1949 and 1950 and placed into <br />service in 1950. The carrying capacity of the Dille Tunnel originally was about 375 cfs, but it <br />1 6 <br />
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