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Date: April 28, 2014 <br /> To: Governance Committee (GC), Water Advisory Committee (WAC)and Executive <br /> Director's Office(EDO) of the Platte River Recovery Implementation Program(PRRIP) <br /> From: Jon Altenhofen, Colorado Water User Member, WAC <br /> Memo Subject: Colorado's Annual Depletion Report for 2013 in the South Platte River Basin <br /> Colorado Plan for Future Depletions (CPFD) Annual Review 2013 <br /> BASIS: Mitigate the adverse impacts of new water related activities in Colorado on FWS Target Flows <br /> and on Program Water Projects by replacing monthly net depletions in river flow caused by population <br /> growth since July 1, 1997 on an average annual basis. Artificial groundwater recharge captures and <br /> retimes monthly net river accretions resulting from population growth into months of net river depletions <br /> (May and June)to offset such depletions. <br /> No changes in basic assumptions for 2013-2014 accounting. 2014 is a 5 year check on assumptions and <br /> projections on% Water Source Mix in Colorado's Plan for Future Depletions and based on recent <br /> discussions in the winter of 2014 with the major municipal water users in each Region, the following <br /> assumptions have not changed and will be used for future years. <br /> (1) South Platte Basin in Colorado divided into North, Central,and South Regions based on counties. <br /> (2)Population Increase by Region since July 1, 1997 (baseline)via State Demographer(SDO)report. The <br /> current report provided to the WAC shows a population for January 1, 2013 in the South Platte River <br /> Basin of 3,617,033, an increase of about 2.1%per year since 1997. Based on the SDO report,the <br /> estimated population in 5 years on January 1,2019 is 3,999,240. <br /> (3) GPCD--Gross Water Use ac-ft/person/year remains at 0.2504. <br /> (4)% Water Source Mix by Region of 6 sources; 5 measured divertible sources (transbasin imports, <br /> nontributary groundwater, agricultural conversion,reuse,and native post-1997 S. Platte flow <br /> development)plus water conservation as a source. Each source has a monthly accretive and/or depletive <br /> effect. See attached Figures for graphs of depletive and accretive effects for July 1,2013 and estimated <br /> effects for July 1, 2019 in 5 years. The May+ June depletive effect for 2019 is estimated at 3,068 ac-ft. <br /> (5)Monthly effects are routed to the Colorado-Nebraska Stateline using administrative routing loss <br /> factors. <br /> CPFD Operations through 2013 <br /> SPWRAP, Inc.--South Platte Water Related Activities Program is a non-profit group of mainly municipal <br /> Colorado water users collecting assessments ($0.90 per tap in 2013) to pay for Colorado's water <br /> obligations for PRRIP in partnership with the State of Colorado where the State covers other Program <br /> costs. SPWRAP obtains creditable river accretions for use in Colorado's Plan for Future Depletions from <br /> 1 <br />