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75E - PH - WATER MANAGEMENT PLAN
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75E - PH - WATER MANAGEMENT PLAN
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6/2/2016 4:41:33 PM
Creation date
6/2/2016 4:18:02 PM
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City Clerk
Doc Type
Agenda Packet
Agency
Public Works
Item #
75E
Date
6/7/2016
Destruction Year
2021
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2015 URBAN WATER MANAGEMENT PLAN <br />The availability of water supplies from the SWP can be highly variable. A wet water year may be followed <br />by a dry or critically dry year and fisheries issues can restrict the operations of the export pumps even <br />when water supplies are available. <br />The Sacramento -San Joaquin River Delta (Delta) is key to the SWP's ability to deliver water to its <br />agricultural and urban contractors. All but five of the 29 SWP contractors receive water deliveries below <br />the Delta (pumped via the Harvey O. Banks or Barker Slough pumping plants). However, the Delta faces <br />many challenges concerning its long -term sustainability such as climate change posing a threat of <br />increased variability in floods and droughts. Sea level rise complicates efforts in managing salinity levels <br />and preserving water quality in the Delta to ensure a suitable water supply for urban and agricultural use. <br />Furthermore, other challenges include continued subsidence of Delta islands, many of which are below <br />sea level, and the related threat of a catastrophic levee failure as the water pressure increases, or as a <br />result of a major seismic event. <br />Ongoing regulatory restrictions, such as those imposed by federal biological opinions (Biops) on the <br />effects of SWP and the federal Central Valley Project (CVP) operations on certain marine life, also <br />contributes to the challenge of determining the SWP's water delivery reliability. In dry, below- normal <br />conditions, Metropolitan has increased the supplies delivered through the California Aqueduct by <br />developing flexible CVP /SWP storage and transfer programs. The goal of the storage /transfer programs <br />is to develop additional dry -year supplies that can be conveyed through the available Harvey O. Banks <br />pumping plant capacity to maximize deliveries through the California Aqueduct during dry hydrologic <br />conditions and regulatory restrictions. In addition, the California State Water Resources Control Board <br />(SWRCB) has set water quality objectives that must be met by the SWP including minimum Delta <br />outflows, limits on SWP and CVP Delta exports, and maximum allowable salinity level. <br />Metropolitan's Board approved a Delta Action Plan in June 2007 that provides a framework for staff to <br />pursue actions with other agencies and stakeholders to build a sustainable Delta and reduce conflicts <br />between water supply conveyance and the environment. The Delta action plan aims to prioritize <br />immediate short -term actions to stabilize the Delta while an ultimate solution is selected, and mid -term <br />steps to maintain the Delta while along -term solution is implemented. Currently, Metropolitan is working <br />towards addressing three basin elements: Delta ecosystem restoration, water supply conveyance, and <br />flood control protection and storage development. <br />"Table A" water is the maximum entitlement of SWP water for each water contracting agency. Currently, <br />the combined maximum Table A amount is 4.17 million AFY. Of this amount, 4.13 million AFY is the <br />maximum Table A water available for delivery from the Delta pumps as stated in the State Water <br />Contract. However, deliveries commonly are less than 50 percent of the Table A. <br />SWP contractors may receive Article 21 water on a short -term basis in addition to Table A water if <br />requested. Article 21 of SWP contracts allows contractors to receive additional water deliveries only <br />under specific conditions, generally during wet months of the year (December through March). Because <br />an SWP contractor must have an immediate use for Article 21 supply or a place to store it outside of the <br />SWP, there are few contractors like Metropolitan that can access such supplies. . <br />Carryover water is SWP water allocated to an SWP contractor and approved for delivery to the contractor <br />in a given year but not used by the end of the year. The unused water is stored in the SWP's share of <br />San Luis Reservoir, when space is available, for the contractor to use in the following year. <br />75E -39 <br />arcadis.com 3 -5 <br />
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