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EA 2007 Water Year AOP
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EA 2007 Water Year AOP
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Last modified
1/26/2010 4:39:34 PM
Creation date
6/25/2009 10:00:35 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8461.450
Description
EAC/RCC Meetings
State
CO
Basin
South Platte
Water Division
1
Author
EA Manager, EAC
Title
EA 2007 Water Year AOP
Water Supply Pro - Doc Type
Operating Principles/Plan
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per year as measured at Grand Island, Nebraska, through re-regulation and water conservation <br />and supply projects. The EA in Nebraska is currently in place and two additional projects, in <br />Colorado and Wyoming, will be developed to supply about 80,000 acre-feet per year toward the <br />Platte River Program's first increment water objective. The remainder of the first increment <br />water objective will be met through a program of incentive-based water conservation and water <br />supply activities described in the Platte River Program's "Reconnaissance-Level Water Action <br />Plan." <br />Service-recommended target flows will serve as the reference point for determining periods of <br />excess and shortage in the operation of Platte River Program re-regulation and water <br />conservation/supply projects during the first increment, or until such time as new information <br />becomes available which indicates modification of the recommended flows is warranted. <br />Recommended target flows are described in detail in the Service's "Instream Flow <br />Recommendations for the Central Platte River" (May 23, 1994) and "Pulse Flow Requirements <br />for the Central Platte River" (August 3, 1994) and summarized in Table 2(pages 9-11). <br />Additional information regarding Service instream flow recommendations and pulse flow <br />requirements, as they relate to the Platte River Program, can be found in, Platte River Recovery <br />Implementation Program, Attachment 5, Section 11, Water Plan Reference Materials (December <br />7, 2005). <br />This EA AOP outlines the Service's general intentions for operation of the EA in the 2007 water <br />year. Changing hydrologic conditions and other considerations may require a change in the <br />course of action described in this AOP. <br />SUMMARY OF WATER YEAR 2006 <br />The Districts are required to predict Storable Natural Inflows (SNI) and Water Year-Type (i.e., <br />very wet, wet, transitional, dry, and very dry) by October 15 of each year. The SNI for October <br />through March is used for calculating "Type-of-Year" whereas the SNI for October through April <br />is used in assigning contributions to the EA. These predictions establish certain reservoir <br />operating rules during the non-irrigation season (see Appendix B). The EA Manager is notified <br />by the Districts of any modification to the predictions that would result in a change in the Year- <br />Type. When practicable, the Districts have also provided projections for flows at Overton and <br />Grand Island, based on their predicted operations, to assist the EA Manager in developing the EA <br />AOP. <br />The Districts' predictions for SNI and Type-of-Year for the 2006 water year and the actual water <br />volumes were as follows: <br />Item Prediction Actual <br />SNI, October through March 270,000 af 310,200 af <br />SNI, October through April 315,000 af 354,070 af <br />Type-of-Year Very Dry <br />Based on anticipated below average carry-over storage in Lake McConaughy and water supply on <br />the North Platte, the Districts' 2006 Water Year Operation Plan again called for maximizing <br />storage while meeting their minimum operational flow requirements. During the non-irrigation <br />Water Year 2007 EA AOP 2 January 19, 2007
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