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• <br /> .• * Northern Colorado Water Conservancy District <br /> N_C V%/C_D 220 War Avenue•Berthoud,CO 80513.974532.7700•fax 970532-0942 <br /> • MEMORANDUM <br /> TO: Mr.Mike Serlet,PE <br /> Colorado Water Conservation Board <br /> 1580 Logan Street,Suite 750 <br /> Denver,CO 80203 $ 0.7t, arcu.2.149cr, <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: April 20,2007 <br /> REF: Accounting for Sedgwick County Well Users,Inc. (SCWU)in Support of Request for <br /> Colorado Agricultural Drought Response Grant for 2006 <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 Year 2006. This involved the use of groundwater models <br /> (AWAS)to compute the lagged well depletions and recharge accretions at the river. <br /> Information was gathered from meter records for the wells and Water Commissioner records <br /> were utilized to quantify recharge site inflows. <br /> 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 Table 1 <br /> (recharge accretion leases for$75,192)and Table 2(augmentation well leases for$55,838) are <br /> the accountings that list the leases of replacement supplies for 2006. Augmentation well <br /> credits are the amounts of pumped water delivered directly to the river minus the lagged <br /> groundwater depletions from prior pumping of the well for augmentation purposes. <br /> SCWU leases these replacement supplies during the period of April 1 through October 15. The <br /> $per acre-foot lease rate for 2006 for net augmentation well credits was$20 per acre-foot. <br /> The$per acre-foot lease rates for 2006 for recharge accretions was$20 or$25 per acre-foot <br /> depending upon leasing entity. <br /> • <br />