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FINAL – 6/05/2014 – R21 2014 Eastern San Joaquin Integrated Regional Water Management Plan 6.6 Major Water Related Infrastructure Major water related infrastructure is depicted in the “Integrated Conjunctive Use Program” map presented as Figure 6‐17. The map illustrates existing and proposed reservoirs, waterways, conveyance systems, irrigation systems, treatment plants, and recharge areas. 6.7 Identification of Supply Sources Water supplies and associated water rights have been secured or have been applied for on most of the stream systems in the region. Water supply sources from the following stream systems are discussed below: Sacramento‐San Joaquin Delta American River Mokelumne River Calaveras River Littlejohns Creek /Rock Creek Stanislaus River San Joaquin River 6.7.1 Sacramento-San Joaquin Delta The Sacramento‐San Joaquin Delta covers more than 738,000 acres in five counties and is comprised of numerous islands within a network of canals and natural sloughs. The Sacramento and San Joaquin Rivers come together in the Delta before they flow to the San Francisco Bay and out to the Pacific Ocean. The Delta is the largest estuary on the U.S. West Coast and is home to over 750 plant and animal species, many of which are threatened or endangered. The Delta provides drinking water for two‐thirds of all Californians and irrigation water for over seven million acres of highly productive farmland. Rivers in the Region all flow through the Delta on their way to San Francisco Bay and the Pacific Ocean. More detailed descriptions of the rivers and the associated facilities are provided in the following sections. 6.7.2 American River The American River watershed lies to the north of San Joaquin County, outside of the Regional Planning Area, and encompasses a drainage area of 1875 square miles.56 San Joaquin County has a pending application to appropriate water from the South Fork American River. The State Water Resources Control Board designated this Application 29657 and assigned it a priority date of February 9, 1990. An amendment to this application was filed with the SWRCB on August 12, 2003. 56 Above Folsom Dam, the principal regulating reservoir Chapter 6 6-54 Water Resources Setting FINAL – 6/05/2014 – R21 2014 Eastern San Joaquin Integrated Regional Water Management Plan Figure 6‐17 Integrated Conjunctive Use Program Infrastructure Map Chapter 6 6-55 Water Resources Setting FINAL – 6/05/2014 – R21 2014 Eastern San Joaquin Integrated Regional Water Management Plan Amended Application 29657 seeks the right to divert for direct use up to 350 cubic feet per second (cfs) from December 1 through June 30 Water to be Appropriated under Amended Application 29657 each year, up to 147,000 acre‐feet per year. A diversion to storage up (acre‐feet per year) to 147,000 acre‐feet per year is also proposed. A maximum of 147,000 would be taken by direct diversion and diversion to storage Direct Diversion 147,000 Storage during any one year. 147,000 Total 147,000 The Amended Application 29657 moves the proposed point of Maximum Diversion 350 cfs diversion to the Freeport diversion site on the Sacramento River. The Rate Sacramento County Water Agency and East Bay Municipal Utility Period of Diversion or District (EBMUD) constructed a 286 cfs diversion at the Freeport site Collection 12/1 ‐ 6/30 which became operational in 2011. Of this capacity, 131 cfs would be used in most years to meet needs within Sacramento County. The Priority Date February 9, 1990 other 155 cfs would be conveyed to a connection point with EBMUD’s Mokelumne Aqueduct in San Joaquin County. EBMUD only needs this capacity in the one‐third driest years. The capacity could be made available to San Joaquin County or other users about two‐thirds of the time in average and wetter years. SWRCB is authorized to declare a stream fully appropriated. If a stream is declared fully appropriated, SWRCB may reject any water right application filed on that stream. If a stream has been declared fully appropriated for part of a year, the application may be modified by the Board. SWRCB has declared the American River system fully appropriated for the period from July 1 through October 31. The Amended Application limits the period of diversion to the period from December 1 through June 30. On October 10, 2010 the SWRCB issued a Cancellation Order for Water Right Application 29657. In November 2010, the County filed a Petition of Reconsideration in response to SWRCB’s Cancellation Order. On June 10, 2011, the County regained Water Right 29657 and has since continued to demonstrate that progress is being made towards developing the Water Right. In 2011‐2012, the County released and accepted the Freeport Element Project Phase 1 Engineering Feasibility Study and re‐ initiated discussions with Sacramento County and East Bay Municipal Utility District to secure access to existing Freeport Project facilities. The Phase 2 Freeport Element Project work consisting of an EIR and accompanying technical documents may start in 2014. 6.7.3 Mokelumne River The Mokelumne River watershed encompasses approximately 660 square miles stretching from the high Sierra Nevada westward to the Delta. Snowmelt comprises a large portion of the watershed’s runoff. Major facilities located on the Mokelumne are the Salt Springs Reservoir on the North Fork of the Mokelumne and the Pardee and Camanche Reservoirs on the river’s main stem. Salt Springs Reservoir is a PG&E facility built in 1963 and is operated for hydropower generation. Pardee and Camanche are both owned by EBMUD. Pardee Reservoir, which is upstream from Camanche, has a capacity of 197,950 acre‐feet and is operated as a water supply reservoir. Reservoir water from Pardee is conveyed by the Mokelumne Aqueducts to the EBMUD service area 82 miles away. Camanche Reservoir, with a capacity of 417,120 acre‐feet, is operated for flood control and to meet in‐stream and downstream Chapter 6 6-56 Water Resources Setting FINAL – 6/05/2014 – R21 2014 Eastern San Joaquin Integrated Regional Water Management Plan requirements.57 Both Pardee and Camanche generate incidental hydropower at 30 MW and 9.9 MW, respectively.58 Water rights on the Mokelumne form a complex hierarchy, with water rights held by Woodbridge Irrigation District, Amador County, Calaveras County, EBMUD, North San Joaquin Water Conservation District, the City of Lodi, and others. 6.7.4 Calaveras River The Calaveras River watershed consists of 363 square miles and stretches from the Sierra Nevada foothills to San Joaquin River in west Stockton. Flow in the Calaveras is primarily derived from rainfall with almost no contribution by snowmelt. The United States Army Corps of Engineers (USACE) constructed the multi‐purpose New Hogan Dam in 1963 for flood control, municipal, industrial, and irrigation purposes. New Hogan Reservoir has a capacity of 317,000 acre‐feet. The USACE controls flood control releases from New Hogan. Stockton East Water District (SEWD) operates New Hogan at all other times. SEWD and Calaveras County Water District (CCWD) have rights to the yield from New Hogan. The current supply available to SEWD is subject to reductions based on CCWD’s future demands. CCWD currently uses approximately 3,500 acre‐feet per year and estimates it will use up to 7,000 acre‐ feet per year by 2040.59 6.7.5 Littlejohns Creek / Rock Creek The Littlejohns/Rock Creek is a large, low‐lying drainage meandering through Calaveras, Stanislaus, and San Joaquin counties. Flood flows on the creeks are attenuated by Farmington Dam, an earthen dam built strictly for flood control by the U.S. Army Corps of Engineers (USACE). SEWD constructed a diversion structure immediately downstream of the dam in 1994 to divert water into the Lower Farmington Canal and Rock Creek, which can supply water to portions of the SEWD and CSJWCD service areas. The unlined Canal has a current capacity to convey 300 cfs to Duck Creek60 and 200 cfs to its terminus near Peters. 6.7.6 Stanislaus River The Stanislaus River watershed consists of approximately 904 square miles with an annual average runoff of approximately 1 million acre‐feet. The majority of the runoff occurs from November to July, and peaks during the summer months when snowmelt is greatest. More than half the runoff is derived from snowmelt.61 The USACE constructed New Melones Dam on the Stanislaus River in 1978, replacing 57 EBMUD describes its reservoir operations as follows: “Pardee and Camanche Reservoirs are operated in an integrated manner to provide water supply benefits and meet downstream needs including stream flow regulation, flood control, fishery habitat, and the needs of downstream riparian and appropriative diverters. Releases from EBMUD’s facilities also provide hydropower benefits.” 58 EBMUD, Urban Water Management Plan 2000 59 Calaveras County Water District, 1996. Recently updated projections provided by CCWD show demands of over 14,000 acre‐ feet by 2035. Unused CCWD supplies used by SEWD are subject to the terms and limitation in their 1970 contract. Increasing growth in Calaveras County makes demand projections highly volatile and CCWD is continually revising these projections. CCWD states that in the future they intend to rely on their New Hogan allocation for multi‐year water supply reliability and drought protection purposes. 60 Note this is Duck Creek is different than the stream to be impounded by the proposed Duck Creek Reservoir 61 USBR website Chapter 6 6-57 Water Resources Setting FINAL – 6/05/2014 – R21 2014 Eastern San Joaquin Integrated Regional Water Management Plan the original Melones Dam. Old Melones Dam was constructed in 1924 jointly by OID and SSJID, which hold pre‐1914 water rights on the Stanislaus River.