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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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A primary component of EA pulse flow planning in 2007 will be to start integrating EA <br />management with the Platte River Program's Water Plan and Adaptive Management Plan <br />processes. It is recognized, however, that full integration in 2007 may not be possible as the <br />Program's infrastructure and plans, as described in Program documents, will not be in place, at <br />least initially. The Service will ensure that implemented pulse flows and associated monitoring <br />and research activities are designed to incrementally help test potential concerns, system <br />constraints, river models, and adaptive management hypotheses to be evaluated by the Platte <br />River Program. <br />Whooping Crane Migration Season (March 23-May 10): If projected average daily flows of <br />300 cfs to 500 cfs occur at Overton during this period, and gains to Grand Island are similar to <br />those in WY06, shortages to the Service's dry year flow target of 1,700 cfs, at Grand Island, will <br />again occur during this important whooping crane migration period. Hydrologic conditions and <br />the status of the whooping crane migration will be closely monitored during this time. If it is <br />determined by the Service that base flows are not providing stop-over opportunities for migrating <br />whooping cranes in the central Platte River, EA releases may be made to augment flows during <br />this period. <br />Late Spring (May/June): As stated previously, improvement of spring pulse events is the <br />Service's highest flow priority (Bowman 1994; Bowman and Carlson 1994). Existing long-term <br />averages for pulse flows are well below Service targets and current projections suggest that <br />below average flow conditions will again occur throughout most of the water year. Although this <br />time period historically experienced elevated flows primarily due to melting mountain snowpack, <br />the Service does not plan to pursue implementation of EA pulse flows in May or June, at this <br />time. Added operational constraints that occur during this late spring pulse period and tern and <br />plover nesting season make implementation more difficult. Until new information indicates <br />otherwise, plans are to pursue initial EA pulse tests in the months of February, March, or April. <br />Summer (June-September): If drought conditions persist, flows during summer 2007 are <br />expected to be similar to those in 2003 to 2006. Even if hydrologic conditions improve during <br />the water year, it is doubtful that much water will reach the central Platte River during the <br />summer months due to the on-going drought coupled with the Districts' anticipated operations <br />and groundwater pumping. If hydrologic conditions improve in the basin making summer flow <br />augmentation practicable, consideration will be given to augmenting extremely low flows during <br />the plover and tern nesting season (June 1 to August 15) to maintain a better forage base of <br />macroinvertebrates and fish. <br />Final plans to augment flows during this period will be based on EA volume, hydrologic <br />conditions, lake levels, conveyance capacity, gains/losses, District operations, presence/absence <br />of nesting terns and plovers, distribution and quantity of forage fish in the area, and availability <br />of suitable riverine foraging habitat. Consideration will be given to the possibility that increased <br />EA releases (i.e., above 500 cfs) might be possible during this time period due to a reduced <br />delivery rate of irrigation water which could "free-up" additional channel capacity in the channel <br />at North Platte. Consideration will also be given to the potential effects on the fish and <br />macroinvertebrate communities that could result from fluctuating EA releases at the J-2 return if <br />CNPPID chooses to hydrocycle during the release period. The Service believes that fluctuating <br />flows from the J-2 return may negate anticipated benefits from flow augmentation. Further <br />investigation into this issue and coordination with CNPPID is ongoing. <br />Water Year 2007 EA AOP 7 January 19, 2007
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