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<br />Table ES-1
<br />Matrix of Alternatives
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<br /> Shortage Guldellnll1l Coordinated ReseNoir Operations (LJke Mead Interim Surplus Guidelines for
<br /> tD reduce deliveries from Lake Mead & LJke Powell) Lake Mead Storage and Delivery of ConseNed deliveries/releases from LJke
<br />Altematlvll1l (elevations in feet msll (elevations in feet msl) Svstem or Non4vstem Water Mead
<br /> - Delermination made through the AOP - Minimum objective release of 8,23 mat from Lake - No waler management mechanism for storage and - No modification or extension of the
<br /> process, absent shortage guidelines Powell unless storage equa~zalion releases are deliveIY of con5elVed system mid/or non-system water ISG which end in 2016
<br /> - Reasonably represented by a twerlevel required - After 2016, determination made
<br />No ActIon shortage strategy. probabilistic protection - Operation at low reseNoir levels reasonably through the AOP process, absent
<br /> of Lake Mead elevation 1,050 and represented by a 8.23 maf release from Lake surplus guidelines; reasonably
<br /> absolute protection of Lake Mead Powell down to Lake Powell dead pool represented by the spill avoidance
<br /> elevation 1 ,000 (referred to as the 70R Strategy)
<br /> - Shortages (i.e., reduced deliveries) of - Under high reseNoir conditions, minimum - Storage and delivery of conseNed system and/or non- - Modification of ISG to eliminate
<br /> 400,500, and 600 kaf from Lake Mead at objective release of 8.23 maf from Lake Powell system water Partial Domestic Surplus condition
<br /> elevations 1,075, 1,050, and 1,025 unless storage equa~zation releases are required - Maximum total storage for conseNed system and/or - Extension of the modified guidelines
<br />Basin States respectively - Under lower reservoir conditions, either reduce non-system waler in Lake Mead of 2.1 mat through 2026
<br /> - Initiate efforts to develop additional Lake Powell release or balance volumes - System assessment of 5 percent of stored COnseNed
<br /> guidetines for shortages if Lake Mead depending upon elevations at Lake PoweD and system and/or non-system water
<br /> faUs below elevation 1,025 (Nole: Lake Mead
<br /> indudes reconsultation with Basin Stales\
<br /> - Shortages are implemented in any given - Under high reservoir conditions, minimum - Prior to shortage, conservation of different volumes of - Modification of ISG to eliminate
<br /> year when necessary to keep Lake Mead objective release of 8.23 maf from Lake Powell waler tied to Lake Mead elevation Partial DomestiC Surplus condition
<br /> above SNWA's lower intake at elevation unless storage equalization releases are required - Storage and de~very of conserved syslem and/or non- - Extension of the modified guidelines
<br />Conservation 1,000 (absolute protection of elevation - Under lower reservoir conditions, either reduce system water through 2026
<br />Before 1,000) Lake Powell release or balance volumes - Water for environmental uses
<br />Shortage depending upon elevation at Lake Powell and - Maximum total storage of conserved system and/or
<br /> Lake Mead non-system waler greater than 4,2 maf
<br /> - System assessment of 5 percent of stored conserved
<br /> system and/or non-sYStem water
<br /> - Release full annual entiUement amounts - Minimum objective release of 8.23 mat from Lake - No water management mechanism for storage and - Extension of the existing ISG
<br /> until Lake Mead is drawn down to dead Powell unless storage equa~zation releases are deliveIY of conseNed system ~d/or non-5YStem water through 2026
<br />Water Supply pool (elevation 895) required
<br /> - Balancing if Lake Powell is below elevation 3,575
<br /> or Lake Mead is below elevation 1,075
<br /> - Shortages (i,e, reduced deliveries) of 600, - Minimum objective release of 8,23 mat from Lake - Storage and de~very of conserved system and/or non- - Permissive provisions of existing
<br /> 800, 1,000, and 1 ,200 kaf from Lake Powell if Lake PaweU is above elevation 3,595 system water ISG terminate in 2007, and during
<br />Reservoir Mead at elevations 1,100,1,075,1,050, unless storage equalization releases are required - Maximum total storage of conseNed system and/or petiod from 2008 to 2026, surplus
<br />Storage and 1,025 respectively - 7,8 mat release from Lake Powell between Lake non-system waler of 3.05 mat determinations are ~mited to
<br /> Powell elevations of 3,560 and 3,595 - System assessment of 10 percent of stored conserved Quantified and Flood Control
<br /> - Balancino below Lake Powell elevation of 3,560 sYStem and/or non-svstem water conditions
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