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I I I I I I I Based on a Glover analysis performed by Resource Engineering, Inc., the estimated stream depletion associated with pumping the CB-2 Well is appr~ximately 1.16 gpm, or 0.0025 cfs. Copper's. proposal, set forth below, potentially could injure ithe Board's instream flow water right on West :;.., Tenmile Creek by not replacing the CB-2 Well's ~epletions in time and amount in late February through mid-May. There is some uncertainty as to exactly where the Well's depletions impact West I Tenmile Creek. The Well will be constructed in fractured bedrock to an anticipated depth of 700 I feet. Presently there are no ground water modeling techniques that would reliably predict the direction of ground water movement in fracturedl rock, but nonetheless, the well is considered tributary to West Tenmile Creek based on the depth bfwell. I ! I I Although the use of the CB-2 Well is generally ~easonal (October through January), a delayed depletion analysis performed by Resource Engin~ering, Inc. for Copper concluded that stream depletions will be evenly spaced throughout the ye~r. Accordingly, Copper Mountain will provide year-round augmentation for depletions associated lith the CB-2 Well as set forth below. Late May through mid-September: Copper will ;dedicate the amount of water needed to irrigate 1.0 acre under its senior West Tenmile Ditch water :right as "dry-up" credit to West Tenmile Creek. The reduced crop consumption will provide a net inbrease in stream yield of 1.45 acre-feet. In Case No. 92CW298, the Division 5 Water Court determi~ed that Copper could divert water from multiple West Ten Mile Creek sources for the irrigation of126.5 acres of golf course. Under the proposal I presented herein, Copper would forego the opportunity to divert water from West Tenmile Creek for I 1.0 acre of irrigation, reducing the allowable irrigat~on to 25.5 acres. Copper will amend its water _. court application so that the resulting decree will require that the amount of water needed to irrigate - the one acre will be dedicated to West Tenmile Creek. Copper will continue to irrigate said one acre from its Tenmile Creek source, which is augmented 1vith releases from Clinton Gulch Reservoir. I I Mid-September through mid-February (primarily snowmaking season): Copper will augment its diversions by releases from Denver's Williams! Fork Reservoir. During that time period, the Board's West Tenmile Creek ISF water right is pr6tected from Copper's diversions operationally. Copper's West Lake diversion system is construct~d to bypass 2 cfs prior to diverting any water from West Tenmile Creek. Because the CB-2 Well! depletions are anticipated to occur upstream of this diversion point, it means there will be less water available for snowmaking at the West Lake Pipeline (i.e., the ISF water right at the compliahce point must be met prior to snowmaking diversions ). -2- '-. Terms of Proposed Stipulation and Decree I Late February through mid May: Copper proposies to release 0.58 acre feet of water from West Lake to augment out-of-priority depletions occurring during the February 16 through May 15 period (a total of 89 days). Releases will be made from West Lake to directly offset the calculated monthly I depletion from the CB-2 Well. This could result in an overall drawdown of West Lake of approximately 8 inches or 0.6 AF. The lake will b~ refilled during the runoff season by exchange using 0.6 AF of Copper Mountain's Clinton Gulch R~servoir water. I I Water surface elevations and the release of water from West Lake are controlled by a series of removable boards located in a concrete vault at the rower, downstream end of the lake. The device .~ functions like a conventional "agri-drain" structure. !When a board is removed, water spills over the t I I Flood Protection. Water Project Planning and Finance. Stream and Lake Protection Water Supply Protection. dmservation Planning