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Last modified
9/26/2011 8:52:20 AM
Creation date
7/10/2008 9:06:22 AM
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Decision Support Systems
Title
SPDSS Task 5 - Key Structure, Harold D. Roberts Tunnel
Description
The Harold D. Roberts Tunnel has been identified as a key structure for the South Platte Decision Support System (SPDSS) consumptive use and surface water modeling efforts. The purpose of this Task 5 memorandum is to document physical, legal, and operational aspects of those key structures identified.
Decision Support - Doc Type
Task Memorandum
Date
4/6/2004
DSS Category
Surface Water
DSS
South Platte
Basin
South Platte
Contract/PO #
C153954
Grant Type
Non-Reimbursable
Bill Number
SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
Prepared By
Leonard Rice Engineering
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Clinton Agreement, <br />Summit County Agreement, and <br />Blue River Decrees. <br />In 1992, Denver Water, Summit County, th e Summit County Ski Areas, the Summit <br />County towns, the Grand County towns, and th e Winter Park Ski area entered into the <br />Clinton Reservoir – Fraser River – Water Agreement (Clinton Agreement). The purpose <br />of the agreement was to provide additi onal water supplies for Summit and Grand <br />Counties. Per the Clinton Agreement, De nver Water agreed to operate its Dillon <br />Reservoir and Roberts Tunnel wate r rights so as to allow Clin ton Reservoir to store up to <br />3,650 acre-feet each year, during the peri od of August 1 through July 31. <br />Per the Summit County Agreement of 1985, Denver Water agrees to subordinate calls for <br />Roberts Tunnel and Dillon Reservoir, includi ng rights of exchange, for out-of-priority <br />diversion from the Blue River by Summit C ounty. Upstream of Dillon Reservoir, <br />Summit County may divert up to 1,750 af/yr for consumptive uses with 58 percent to be <br />replaced to Denver and up to 1,350 af/yr for snowmaking with 14.5 percent to be <br />replaced. Replacement sources include pur chase and exchange from Green Mountain <br />Reservoir, Clayton Hill water, and Benson Ranch water. <br />The Blue River Decrees limit the future deve lopment of Western Slope water by ensuring <br />that Denver Water reuses its transmountain wa ter before additional Western Slope water <br />can be developed. Use of Roberts Tunnel may be limited by this decree. <br />There are numerous other legal agreements that govern the Roberts Tunnel system. <br />Denver has a 1935 priority to exchange from the Williams Fork Reservoir to the Roberts <br />Tunnel (and Dillon Reservoir) and to the Moffat Tunnel collection system. And the 1995 <br />Agreement between Denver, Englewood, and Cypress Climax Metals Company concerns <br />the allocation of the Englewood-Ranc h Creek Collection System yield. <br />OPERATIONAL INFORMATION <br />Denver Water operates Roberts Tunnel year-rou nd. Under normal conditions, the minimum flow <br />taken through the Tunnel is appr oximately 60 cfs, the minimum fl ow required for operation of <br />the North Fork hydroelectric plant at the East Portal. A limiting factor for flow through Roberts <br />Tunnel is the channel capacity be low the East Portal in the Nort h Fork of the South Platte. <br />Diversions through Roberts Tunnel ar e closely monitored in an attemp t to keep the total flow in <br />the North Fork of the South Platte below 680 cf s at the town of Grant and below 980 cfs above <br />the confluence with the mainstem of the South Pl atte River. During th e winter months, flow <br />through the Tunnel may be further li mited as a result of reduction in channel capacity due to ice. <br />When the Blue River Diversion Project (Roberts T unnel) direct flow right s are in-priority, that <br />water is diverted through the Tunnel. When Roberts Tunnel di rect flow rights are out-of- <br />priority, water stored under Denver Water’s Dill on Reservoir storage rights is diverted through <br />the Tunnel. <br />RobertsTunnel.doc 7 of 10 <br />
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