Farmington Dam Repurpose Project

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1 Farmington Dam Repurpose Project 2017 $158,100,000 to re-purpose the Farmington Dam from flood protection only to a long-term water storage facility that increases water supply reliability to the region. The recent 5-year drought highlights a critical need for more water storage. The proposed project is to re-purpose the Farmington Dam from flood protection only to a long-term water storage facility that increases water supply reliability to the Stockton metropolitan area and mitigates groundwater overdraft in the eastern portion of the San Joaquin Valley. Re-purposing Farmington Dam would increase the amount of stored surface water supplies in the region through the transfer of New Melones water or the capture of storm water when available. The original purpose of Farmington Dam for flood control would be enhanced by the additional capabilities of capturing storm water and year round storage. Scot A. Moody, General Manager Stockton East Water District P.O. Box 5157 Stockton, CA (209) smoody@sewd.net Stockton metropolitan area San Joaquin Valley Stored surface water supplies in the region

2 Project Details / Talking Points The project includes: - Placing a 40-foot-deep slurry cutoff wall along the entire length of the dam to minimize seepage. - Improving two sections of the dam foundation, 500 feet long, for safety and seepage. This improvement would be required for any water storage option at Farmington Dam. - Replacing the existing 95-foot broad crest weir spillway with a 200-foot-wide ogee spillway to accommodate the new probable maximum flood (PMF). The size of the spillway is calculated based on a reservoir size of 112,000 acre-feet. A similar improvement would be required for a 52,000 acre-foot reservoir for water storage. - Acquiring reservoir lands in fee. Most of the lands within the reservoir area were obtained through flood-control easements and are farmed or grazed during the non-flood season. Long-term water storage in the reservoir would reduce or eliminate the opportunity for agricultural land uses and would require the purchase of some or all reservoir lands. The proposed project is to re-purpose the Farmington Dam from flood protection only to a long-term water storage facility that increases water supply reliability to the Stockton metropolitan area and mitigates groundwater overdraft in the eastern portion of the San Joaquin Valley. Re-purposing Farmington Dam would increase the amount of stored surface water supplies in the region through the transfer of New Melones water or the capture of storm water when available. The original purpose of Farmington Dam for flood control would be enhanced by the additional capabilities of capturing storm water and year round storage. areas dropping to 100 feet below historic levels. CA DWR s groundwater Bulletin 118 (2006 update) states measurements over the past 40 years show fairly continuous decline in groundwater levels in Eastern San Joaquin County. In 1998, the US Army Corps of Engineers issued a Conjunctive Use Study on the Farmington Dam and Reservoir and found that the primary benefit identified was the reduction of aquifer degradation (including both overdraft and salinity intrusion) in proportion to surface water development. The proposed project consists of modifying Farmington Dam to allow long-term storage and regulation of local inflow to Littlejohns Creek and water diverted from the Stanislaus River. The proposed project would provide an additional water supply in the amount of 60,000 acre feet and would allow SEWD access to local inflow to Littlejohns Creek and Stanislaus River spills when storm water is available. Stored water would be released from Farmington Reservoir to satisfy downstream requirements and to optimize SEWD diversions to help offset groundwater overdraft in the study area. The reservoir would be evacuated sufficiently prior to the flood season, in order to provide flood control storage space. Releases to Rock Creek would be based on minimum instream flow objectives established by state and federal fish and wildlife agencies. The Eastern San Joaquin Basin is a region that for a half-century has seen groundwater levels decline an average of 1.7 feet per year, with some

3 Bellota Fish Ladder & Passage Improvement 2017 $15,000,000 construct permanent fish ladders and a weir to facilitate steelhead passage, and to install fish screens that prevent fish entrainment, both with the purpose of enhancing steelhead populations of anadromous salmonids. Fish passage issues have been identified as a problem in the Calaveras River watershed. These problems include potential entrainment of fish into unscreened diversions and various degrees of migration blockages. This Stockton East Water District project addresses multiple issues including: improving passage for adult steelhead (O. mykiss) fish access to optimal spawning and rearing habitat upstream of the project area; directing and providing protection for out-migrating juvenile steelhead; and modernizing fish screens at the Bellota Intake Structure for water supply reliability for the greater Stockton area residents. Scot A. Moody, General Manager Stockton East Water District PO Box 5157 Stockton, CA (209) smoody@sewd.net Stockton and greater San Joaquin County residents Steelhead fish populations

4 Project Details / Talking Points The proposed project includes Phases III and IV, the final design and construction of: - a modern fish screen at the District s Bellota Intake Structure for the water treatment plant, - a fishway to improve upstream migration for salmonids at the Bellota Weir and Mormon Slough, and - a fish exclusion structure on the Old Calaveras River channel to prevent entrainment of juvenile salmonids into the Old Calaveras River channel. The purposes of this project are to enhance the populations of anadromous salmonids dependent on the Calaveras River and Mormon Slough and to prevent entrainment of fish in river diversions. Entrainment was identified as a limiting factor affecting recovery of Lower Calaveras River steelhead (O. mykiss) populations by U.S. Fish and Wildlife Service (USFWS). The project would allow anadromous fish reach habitat further upstream and meet the objectives of the CVPIA, CWA, and CDWF s Species Conservation and Recovery program. Specifically, the project would eliminate barriers to fish migration, reduce species survival stressors, increase habitat for threatened and endangered species, and increase water supply reliability to the water treatment plant. The project has been listed as one of the top priorities for the region under the California Water Action Plan. The project is shovel ready and both Phase III and Phase IV would take 2 years to complete for a total project completion period of 4 years.

5 South Gulch Water Conservation Project 2017 $1,000,000 for a feasibility study to study and evaluate the implementation of the South Gulch Water Conservation Project to improve water supply reliability and flood protection for the greater Stockton Metropolitan Area. The proposed South Gulch Water Conservation Project would increase the water supply reliability and flood protection for the greater Stockton Area. The project includes constructing an off-stream reservoir with related appurtenances for the Calaveras River to store and regulate flood releases from New Hogan Dam for future water supply and flood prevention. The project Stockton metropolitan area San Joaquin Valley Stored surface water supplies in the region would alleviate 200-year flood events with projected future climate change. The main purpose of the proposed project is to increase Stockton East Water District (the District s) surface water supply and reliability and mitigate for the 200-year flood event with projected climate change in the Calaveras River. Scot A. Moody, General Manager Stockton East Water District P.O. Box 5157 Stockton, CA (209) smoody@sewd.net

6 Project Details / Talking Points The project includes constructing an off-stream reservoir with related appurtenances for the Calaveras River to store and regulate flood releases from New Hogan Dam for future water supply and flood prevention. The project would alleviate 200-year flood events with projected future climate change. In October 2016, DWR released a draft Basin Wide Feasibility Study, San Joaquin Basin (Feasibility Study) as part of the Central Valley Flood Protection Plan. In the Feasibility Study, Calaveras River Watershed Reservoir Management recommended an additional 42 thousand acre-feet (TAF) of storage in the Calaveras River watershed to mitigate flood stage increases caused by projected climate change and reduces the need for some levee improvements. According to the Feasibility Study, San Joaquin Basin, increased flood storage in the Calaveras River alone would obviate the need for approximately $100 million of floodwalls and levee raises to protect against the 200-year event with projected climate change. Existing developments along the Calaveras River are directly adjacent to the levees, complicating future levee/floodwall improvements in the area. The proposed Project would increase water supply reliability for the City of Stockton and would alleviate the need for additional flood infrastructure downstream. Hydraulic analysis should demonstrate the benefit of system improvements that reduce the need for future levee raises and reveal important synergies of water conservation coupled with flood protection. Upstream storage can reduce the extent of stage increases downstream. Increased flood storage in the Calaveras River watershed can eliminate the need for 1 mile of urban levee raises and 15 miles of flood walls on the Calaveras River.

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