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COLORADO'S TAMARACK PLAN PHASE 3 IMPLEl\1ENTATION Apri124,2000 As part of the Water Action Plan, Colorado is committed to an expanded groundwater recharge effort called Tamarack Plan Phase 3. This effort is expected to reduce target flow shortages by an average of approximately 17,000 ac-ft/year over the target flow reductions provided by Tamarack Plan Phase 1. Three wells next to the river are currently pumping to recharge basins farther from the river at the Colorado Division of Wildlife's Tamarack Ranch State Wildlife Area (SW A) near Crook, Colorado. Seven more wells are scheduled to be drilled by July 2000 and another three by December 2000. This will give a total of 13 wells pumping to recharge at Tamarack Ranch SWAby the winter of 2000- 2001. These wells and credits from recharge in existing canals are the basis of Colorado's Tamarack Plan Phase I as described in Tab 3A of the Cooperative Agreement. The credit from Phase I is an average of 10,000 ac-ft/year for the period of April through September. Colorado's total commitment to provide additional water is Phase 1 plus Phase 3 for a total of 27,000 ac-ft/year. For reference, Tamarack Phase 2 as described in Tab 3B (Colorado's Plan for Future Depletions) of the Cooperative Agreement uses Tamarack Plan reregulation facilities to shift net accretions to the stream resulting from future growth to periods of net depletions from future growth. Remaining net accretions from future growth that are not shifted and occur during times of target flow shortages should be credited as part of Colorado's 27,000 ac-ft/year contribution. As described in Colorado's Tamarack Plan Tab 3A ofthe Cooperative Agreement and in Boyle's Draft Water Action Plan Revision No.3 (April 2000), existing canals will be utilized for their excess recharge capacity. Current ditch recharge programs are used to augment their shareholder's irrigation well depletions, but also generate excess accretion credits that are not needed for well augmentation. The following proposed implementation schedule and approximate costs are based on Boyle's Draft Water Action Plan of April 2000 where costs are given in Table III-48 for a Tamarack Phase 3 yielding an average of 17,000 ac-ft/year. Agreements with existing canals would be developed by year 2 and wells for recharge on public SW A lands and private lands would be developed at the rate of about 10 wells per year or 5 years to develop up to 50 wells. A./d ~'~ /J,., res.aa..rJ -./ ,/n,-;,E;."":!:7 Program Year Capital Cost (1999 $) Annual Costs (1999 $) 1 1,138,600 160,600 2 775,600 221,200 3 775,600 281,800 4 775,600 342,400 5 775,600 403,000 6 0 403,000 7 0 403,000 8 0 403,000 9 0 403,000 10 0 403,000 11 0 403,000 12 0 403,000 13 0 403,000 IW ~!2 m.II;_ ~.o ..,. 1. h-o I ii, c.... gg