Presentation is loading. Please wait.

Presentation is loading. Please wait.

Southern Nevada Water Authority The Colorado River and Nevada Association of California Water Agencies Fall 2010 Conference December 1, 2010.

Similar presentations

Presentation on theme: "Southern Nevada Water Authority The Colorado River and Nevada Association of California Water Agencies Fall 2010 Conference December 1, 2010."— Presentation transcript:

1 Southern Nevada Water Authority The Colorado River and Nevada Association of California Water Agencies Fall 2010 Conference December 1, 2010

2 Southern Nevada Water Authority Background: Law of the River Colorado River Hydrology

3 Southern Nevada Water Authority 3 Colorado River Basin 16.5 million acre-feet (maf) allocated annually 1.7 maf lost to evaporation annually 15.1 maf average annual natural inflow into Lake Powell over past 100 years 66% of average annual inflow to Lake Powell for last 9 years Irrigates 3 million acres Serves about 30 million people including Phoenix, Las Vegas, Los Angeles, Denver, Albuquerque and San Diego areas

4 Southern Nevada Water Authority Beginning in 2000, severe drought conditions began affecting the Colorado River Basin. Fishing Dock at Lake Mead Marina - Nov. 2008

5 Southern Nevada Water Authority Hoover Dam, Lake Mead Since that time, Lake Meads elevation has dropped by more than 100 feet.

6 Southern Nevada Water Authority 6 Natural Flow Colorado River at Lees Ferry - Water Year 1906 to 2010

7 Southern Nevada Water Authority 7 Annual Natural Flow at Lees Ferry Tree-ring Reconstruction (Meko et al., 2007) 25-Year Running Mean

8 Southern Nevada Water Authority Colorado River

9 Southern Nevada Water Authority 9 Colorado Resources Used to Meet Demands Basic Apportionment -300,000 acre-feet for Nevada Intentionally Created Unused Apportionment -Water banking agreements with California and Arizona Intentionally Created Surplus

10 Southern Nevada Water Authority Existing Law of the River Concerning Shortages

11 Southern Nevada Water Authority 11 Existing Law of the River Concerning Shortage 1944 Treaty between the United States and Mexico -In the event of extraordinary drought or serious accident to the irrigation system in the United States, Mexico will be reduced in the same proportion as consumptive uses in the United States are reduced

12 Southern Nevada Water Authority 12 Existing Law of the River Concerning Shortage 1964 U.S. Supreme Court Decree Arizona v. California, Article II(B)(3) -If less than 7.5 million acre-feet is available, Secretary of the Interior will satisfy demands based on present perfected water rights regardless of state lines -Anything remaining will be apportioned in accordance with the Boulder Canyon Project Act -California will not receive more than 4.4 million acre-feet

13 Southern Nevada Water Authority 13 Existing Law of the River Concerning Shortage 1968 Colorado River Basin Project Act -When there is insufficient water to meet lower basin demands, Central Arizona Project shall be limited as to assure the availability of water for consumptive uses of present perfected rights -Nevada shall not bear in shortages greater than it would have to before this Act -Act does not affect relative priorities of water in CA, AZ, and NV that are senior to Central Arizona Project

14 Southern Nevada Water Authority 2007 Interim Guidelines and Associated Agreements

15 Southern Nevada Water Authority 15 Background In January 2001, the Secretary of the Interior adopted the Colorado River Interim Surplus Guidelines to identify the conditions that are used to determine the availability of surplus water for Arizona, California, and Nevada Following the adoption of the Interim Surplus Guidelines, drought significantly reduced the storage levels in Lakes Powell and Mead

16 Southern Nevada Water Authority 16 Background At that time, significant disagreements between the Upper and Lower Basins, as well as among the Lower Basin States included: Annual Operating Plan disagreement -Article II(B)(2) of the Decree in AZ v. CA (50/46/4) -Quantity and timing of shortages In May 2005, the Secretary announced a process to develop Lower Basin shortage guidelines and explore management options for the operation of Lakes Powell and Mead, which began the initiation of a NEPA process

17 Southern Nevada Water Authority 17 Background In February 2006, the Seven States sent a Preliminary Proposal to the Secretary regarding Colorado River interim operations in response to NEPA scoping Preliminary proposal focused on four primary elements: -Modification and extension of Interim Surplus Guidelines -Coordinated reservoir operation between Lakes Powell and Mead -Quantified shortages in the Lower Basin based on Lake Mead water elevations -Creation of Intentionally Created Surplus program (ICS) Preliminary Proposal also attached a Draft Agreement among the Seven States The Seven States Agreement designed a cooperative process to avoid conflicts between the states

18 Southern Nevada Water Authority 18 Background In December of 2007 the Secretary of the Interior issued a Record of Decision for Colorado River Interim Guidelines for Lower Basin Shortages and the Coordinated Operations for Lake Powell and Lake Mead and adopted all of the main components of the Basin States Proposal

19 Southern Nevada Water Authority 19 Intentionally Created Surplus (ICS) Nevada can create and utilize Intentionally Created Surplus by conveying Nevada groundwater and water from the Virgin and Muddy Rivers through Lake Mead The Shortage Sharing Agreement and Interim Guidelines provide that this water will be available during declared shortages as Developed Shortage Supply (DSS)

20 Southern Nevada Water Authority 20 Allows a water user to fallow water rights in tributaries that were in use prior to the effective date of the Boulder Canyon Project Act (1929) -Water is transported through the Colorado River -Nevada has approximately 50,000 acre-feet within this category on the Virgin and Muddy rivers (SNWA currently owns or controls about 30,000 acre-feet) Can be taken during shortage (DSS) Tributary Conservation

21 Southern Nevada Water Authority 21 Allows a water user to fund a system efficiency project that would conserve Colorado River water Such projects include the Drop 2 Reservoir Project and the operation of the Yuma Desalting Plant The project must increase the amount of water available in the U.S. and a portion of the saved water is credited to the user funding the project Cannot be taken during shortage System Efficiency Projects

22 Southern Nevada Water Authority 22 Drop 2 Reservoir Project System Efficiency ICS Project

23 Southern Nevada Water Authority 23 Drop 2 Reservoir Project Design and construction cost originally estimated at $172 million (with 20% contingency, $206 million) -$9.6 million has already been refunded to the states and additional refunds are expected as the project closes out SNWA provided $ million to fund the design, construction and operation of the Drop 2 reservoir and SNWA will receive up to 400,000 acre-feet of ICS credits The Metropolitan Water District of Southern California and the Central Arizona Water Conservation District exercised their option to contribute $28.67 million each in return for 100,000 acre-feet each of ICS credits

24 Southern Nevada Water Authority First Fill – Drop 2 Reservoir 24

25 Southern Nevada Water Authority 25 Allows non-Colorado River system water to be conveyed through and diverted from system reservoirs -Includes SNWAs Coyote Spring groundwater rights that will be introduced into Lake Mead via the Muddy River (Currently 9,000 acre-feet) Can be taken during shortage (DSS) A pipeline has been constructed and water deliveries began in November 2010 Imported ICS

26 Southern Nevada Water Authority 26 Intentionally Created Unused Apportionment

27 Southern Nevada Water Authority 27 Existing Law of the River concerning Surplus and Unused Water 1964 U.S. Supreme Court Decree Arizona v. California (2006 Consolidated Decree), Article II(B)(2) -If more than 7.5 million acre-feet is available for consumptive use the Secretary of the Interior will apportion 50% to California, 46% to Arizona, and 4% to Nevada 1964 U.S. Supreme Court Decree Arizona v. California (2006 Consolidated Decree), Article II(B)(6) -If, in one year, water apportioned for use in a State will not be consumed, the Secretary of the Interior may release the apportioned but unused water for consumptive use in other states -No rights to recurrent use of the water shall accrue

28 Southern Nevada Water Authority 28 Existing Law of the River concerning Surplus and Unused Water 1999 Final Rule for Offstream Storage of Colorado River Water (43 CFR Part 414) -Regulation promulgated by the Secretary of the Interior to establish a procedural framework for facilitating interstate off- stream banking transactions including a commitment by the Secretary to release Intentionally Created Unused Apportionment (ICUA) as a part of such transactions

29 Southern Nevada Water Authority 29 Intentionally Created Unused Apportionment SNWA has entered into interstate water banking agreements with both California and Arizona Agreements allow for SNWA to store water in California, and at a later date when SNWA needs the water, California will intentionally reduce their consumptive use below 4.4 MAF and the unused water will be directed to SNWA

30 Southern Nevada Water Authority 30 Interstate Water Banking Agreement with Arizona Original agreement signed in 2001, amendments entered into in 2004 and 2009 Guaranteed 1.25 million acre-feet of credits for SNWA with return flow credits for an estimated diversion of million acre-feet Allowed Nevada to utilize Arizona bank to make up shortages, unless a shortage impacts Arizona municipalities, then Nevada will reduce recovery proportionally to Arizonas municipal shortage Established SNWA schedule to pay $330 million between 2005 and 2018 * AWBA has stored approximately 527,000 acre-feet of credits for SNWA

31 Southern Nevada Water Authority Unused Apportionment in 2010 Nevada is likely to have unused apportionment in 2010 On November 8, 2010, SNWA and the Metropolitan Water District of California submitted a letter to the Regional Director of the Lower Colorado River Region of the Bureau of Reclamation requesting this water be left in Lake Mead to benefit system storage and help delay the onset of shortages instead of being reallocated in accordance with Article II(B)(6) 31

32 Southern Nevada Water Authority Conservation

33 Southern Nevada Water Authority 33 Southern Nevada recycles nearly every drop of water that is used indoors and receives return-flow credits for this water Indoor Water Use

34 Southern Nevada Water Authority The Water Smart Landscapes Program rebates businesses and homeowners $1.50 for every square-foot of turf removed and replaced with water efficient landscape. Program Results $164,700,000 rebated 148,353,000 square feet converted 8 billion gallons saved annually More than 41 billion gallons saved since inception

35 Southern Nevada Water Authority Gallons Per Capita Per Day (GPCD) Water Usage Water Conservation Previous Goal Attained: 250 GPCD by 2010 New Goal: 199 GPCD by

36 Southern Nevada Water Authority , , , , ,000 Water Conservation Achievements Southern Nevada's annual water consumption decreased by approximately 20 billion gallons between 2002 and 2008, despite a population increase of 400,000 during that span

37 Southern Nevada Water Authority 37 Meeting Future Demands Summary of Projected Water Demands and Water Resources 0 200, , , ,000 1,000,000 1,200,000 1,400, Water Demands (acre-feet) Conservation Colorado River and Las Vegas Valley Groundwater Future Resources to Full Consumption

38 Southern Nevada Water Authority Questions

Download ppt "Southern Nevada Water Authority The Colorado River and Nevada Association of California Water Agencies Fall 2010 Conference December 1, 2010."

Similar presentations

Ads by Google