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Date: April 18,2016 <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 2015 in the South Platte River Basin <br /> Colorado Plan for Future Depletions (CPFD)—Annual Review 2015 <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 2015-2016 accounting. The following assumptions have not <br /> 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, 2015 in the South Platte River <br /> Basin of 3,763,344, an increase of about 2.2%per year since 1997. <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 Figure 1 for graph of depletive and accretive effects. <br /> (5)Monthly effects are routed to the Colorado-Nebraska Stateline using administrative routing loss <br /> factors. <br /> CPFD Operations through 2015 <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 2015)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)dedicated groundwater recharge projects collaboratively developed and operated by SPWRAP, Inc. and <br /> (2)by paying for creditable accretions not used by existing recharge plans. <br /> 1 <br />