2011-03-14_REVISION - M1977493 (41)

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. CM0000878 HELTON & WILLIAMSEN, P.C. CONSULTING ENGINEERS IN WATER RESOURCES 384 INVERNESS DRIVE SOUTH, SUITE 115 ENGLEWOOD, COLORADO 80112 PHONE (303) 792-2161 FAX (303) 792-2165 May 13, 1997 Glenn E. Porzak, Esq. Porzak Browning & Johnson, LLP 929 Pearl Street, Suite 300 Boulder, Colorado 80302 Dear Glenn: 'srP C 4 _#y Subject: Eagle Park Reservoir J C I As requested, following is a breakdown of the dry-year yield for Eagle Park Reservoir by supply source: 1. Trib. area above Res. 2. Chalk Mtn. Int. (Eagle R.) 3. Chalk Mtn. Int. (Ten Mile) 4. East Fork Pump (5 cfs) Dry-year Yiel d (ac-ft) In-Priority Exchanges of Cumulative 775 138 913 913 252 37 289 1,202 312 44 356 1,558 350 105 455 2,013 1,689 324 2,013 The supply sources were included in the total water supply in the order shown, with the East Fork Pump being the last increment of yield. From my discussions with Gary Thompson and as stated in his July 1994 report, diversions by the Chalk Mountain Interceptor of water from the Ten Mile Creek basin to the East Fork basin will be considered as accretions to the Eagle River basin. It is my understanding that the water from the interceptor will flow to Eagle Park Reservoir unless the reservoir is full, in which case the water would be delivered to Robinson Reservoir or to the East Fork Eagle River. This is consistent with the manner that Gary and I operated Eagle Park Reservoir to estimate drv-year yield. If the Ten Mile Creek portion of the Chalk Mountain Interceptor is removed from the project and the capacity of the East Fork Pump is increased to 6 cfs, the dry-year yield would be 1,956 acre-feet as shown below: 1. Trib. area above Res. 2. Chalk Mtn. Int. (Eagle R.) 3. East Fork Pump (6 cfs) Dry-year Yield (ac ft)7 )n-Qjior& Exchanges tal Cumulates 775 13? 913 913 25,2 37 289 1,202 _Q25 _i-22 754 1,956 1,652 304 1,956 Exhibit 17