PRRIP North Platte 04/20/2010 - Laserfiche WebLink

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Special Irrigation Season EA Release to Test North Platte Choke Point Capacity: The PRRIP will continue to monitor the discharge capacity of the North Platte River at North Platte, as it relates to the National Weather Service flood stage of 6.0 foot. The Program and other organizations continue to manage invasive phragmites, one of the factors contributing to reduced capacity at the choke point, and investigate other means of increasing discharge capacity. If during routine irrigation season deliveries down the North Platte River by the Districts, it becomes apparent that the capacity could be tested again by the release of EA water (i.e. in combination with natural flow and storage water releases to create a total flow that approaches the equivalent of a flood stage- magnitude release), such use of EA water will be considered. Estimate of WY 10 EA Carry -Over: WY09 Carry -Over 87,680 87,680 10% Storable Natural Inflows + 38,500 +39,475* Evap & Seepage Loss - 15,000 * - 4,270* EA Summer Flow Augmentation - 30,000 - 35,000 WY10 EA Carry -Over 81,180 * * Estimate 87,885 EA Release Priorities for WY09 (from Table 2 in WY09 AOP) Oct 1 —Nov 15 1,800 whooping crane, waterfowl Medium/Low Nov 16 — Jan 31 600 fish community, bald eagle Low Feb 1 — Feb 15 1,200 sandhill crane, others Low Feb 16 — Mar 15 2,250 system processes (e.g. pulse) High Mar 16 — Mar 22 1,800 sandhill crane, others Low Mar 23 —May 10 1,700 whooping crane, others Medium/Low May 1 — June 30 system processes Low May 11 — Sept 15 1,200 least tern, piping plover Medium Sept 16 — Sept 30 1,000 fish community Low Carry -over Medium