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• <br /> .; Northern Colorado Water Conservancy District <br /> N <br /> LC <br /> 220 Water Avenue• Berthoud,CO 80513 •970-532-7700 • fax 970-532-0942 <br /> MEMORANDUM <br /> TO: Mr. Mike Serlet, PE <br /> Colorado Water Conservation Board <br /> 1580 Logan Street, Suite 750 <br /> Denver, CO 80203 ! � 4 $ <br /> FROM: Jon Altenhofen, PE <br /> Supervisory Water Resources Engineer <br /> Northern Colorado Water Conservancy District (NCWCD) <br /> 220 Water Ave., Berthoud, CO 80513; 970-622-2236;jaltenhofen@ncwcd.org <br /> DATE: March 21, 2005 <br /> REF: Accounting for Sedgwick County Well Users, Inc. (SCWU)in Support of Request for <br /> Colorado Agricultural Drought Response Grant for 2003 and 2004 <br /> NCWCD's Augmentation Recharge Accounting (ARA)Program provides accounting services <br /> to augmentation plans in the lower South Platte River in Colorado. As Water Resources <br /> Engineer responsible for the ARA Program, I completed all the accounting necessary for <br /> SCWU operations for Water Years 2003 and 2004. This involved the use of groundwater <br /> models (SDFView)to compute the lagged well depletions and recharge accretions at the river. <br /> Information was gathered from acreage reports and electrical power records for the wells and <br /> Water Commissioner records were utilized to quantify recharge site inflows. <br /> 1111 Monthly updates of the accounting for net effects on the river were submitted to the Division <br /> Engineer to verify that all out-of-priority well depletions were augmented from the SCWU <br /> replacement supplies consisting of both recharge accretions and pumping of augmentation <br /> wells directly back to the river. Inflows to groundwater recharge ponds result in accretions at <br /> the river later in time. Augmentation wells are pumped directly to the river through ditches <br /> and creeks on days of river call to replace the remaining depletions not covered by recharge <br /> accretions. The use of augmentation wells also causes depletions in the future that must be <br /> replaced if out-of-priority. <br /> The accounting completed for SCWU for the depletions of member wells is utilized by SCWU <br /> to assess their members at a$ per acre-foot of depletions at the river. SCWU uses these <br /> collected water fees to lease the replacement supplies (i.e., recharge accretions and <br /> augmentation wells) developed by SCWU members and others. The attached Tables lA and <br /> 1B (2003) and Tables 2A and 2B (2004) are the accountings that list the leases of replacement <br /> supplies for these years. <br /> Tables lA (2003) and 2A (2004) list recharge accretions and Tables 1B (2003) and 2B (2004) <br /> list augmentation well credits. Augmentation well credits are the amounts of pumped water <br /> delivered directly to the river minus the lagged groundwater depletions from prior pumping of <br /> the well for augmentation purposes. SCWU leases these replacement supplies during the <br /> period of April 1 through October 15. The $per acre-foot lease rates are shown on the tables. <br /> • For 2003 and 2004, the lease rate for net augmentation well credit was $20 per acre-foot. <br /> Recharge accretions in 2003 were leased at$15/ac-ft on days of no call and$20/ac-ft on days <br /> 1 <br />