Sacramento River

Summary Matrix of the NMFS and Service Coordinated Long-term Operation BiOps RPA actions

Delta Stewardship Council (Delta Council) | July 1st, 2019

Summary of Draft Environmental Impact Report Peripheral Canal Project

California Department of Water Resources (DWR) | August 1st, 1974

Summary of Federal and State Water Project Environmental Impacts in the San Francisco Bay-Delta Estuary, California

American Association for the Advancement of Science (AAAS) | July 15th, 1996

Summary of NMFS BiOp RPA Actions for Water Year 2014

Delta Stewardship Council (Delta Council) | October 30th, 2014

Summary Report on the Transactions of the Smelt Working Group in Water Year 2014

Delta Stewardship Council (Delta Council) | August 29th, 2014

The Bay‐Delta Fish and Wildlife Office (BDFWO) has prepared this report to summarize the implementation the U.S. Fish and Wildlife Service’s (Service) biological opi

The Bay‐Delta Fish and Wildlife Office (BDFWO) has prepared this report to summarize the implementation the U.S. Fish and Wildlife Service’s (Service) biological opinion on the Central Valley Project (CVP) and State Water Project (SWP) Long‐term Operations (BiOp) in Water Year (WY) 2014. In addition to background information pertinent to implementation of the BiOp , this report provides a summary of the transactions of the Smelt Working Group (SWG), as well as water operations and during WY 2014. The SWG is a technical team that evaluates biological and technical issues regarding Delta Smelt (Hypomesus transpacificus) and develops recommendations for consideration by the Service during implementation of the BiOp’s Reasonable and Prudent Alternative (RPA) actions. During WY 2014 the SWG made no recommendations for more restrictive water operations and the Service issued no determinations to reduce water exports.

Summary Report on the Transactions of the Smelt Working Group in Water Year 2018

Delta Stewardship Council (Delta Council) | November 1st, 2018

Summary report: Green sturgeon, longfin smelt, and dredging operations in the San Francisco Estuary

San Francisco Estuary Institute (SFEI) | December 1st, 2009

In 2009, California Department of Fish and Game Commission listed longfin smelt (Spirinchus thaleichthys) as threatened, and NOAA formally adopted “take” provisions f

In 2009, California Department of Fish and Game Commission listed longfin smelt (Spirinchus thaleichthys) as threatened, and NOAA formally adopted “take” provisions for green sturgeon (Acipenser medirostris Ayres). These changes in the management status, and associated permitting issues, have prompted renewed interest among [long term management strategy] LTMS participants in the management of these native fish. In response, LTMS held symposia on December 2 and 3, 2009, to review and consider the science, management, and policy related to dredging activities and these species. A primary stressor to both species is reduction of appropriate habitat, due to water diversion activities and other basin-scale modifications in water flow. Local studies of dredging have shown little evidence of direct entrainment for either species, and the frequency of encounter with sites of dredging activity is likely to be very low. Nevertheless, spatial and temporal patterns of population movements and reproductive activity vary from year to year, making it difficult to employ an environmental work windows approach. Available information is limited on other direct effects of dredging, including sediment contamination, habitat modification, and underwater noise. Indirect effects due to maintenance of active navigation channels pose potential concerns. In particular, introduction of invasive species, and mortality due to propeller strikes, both warrant attention. As a follow up step to the symposia, we recommend that LTMS host a workshop targeted towards specific LTMS management needs for green sturgeon and longfin smelt. The workshop should include LTMS participants, the scientists that presented at the symposium, and dredging operators, and could focus on the integration of current research findings into tools that would be useful for managers. Appropriate tools for consideration include predictive or descriptive models of species distribution, and of potential impacts of various dredging activities. There should also be consideration of management approaches that broadly address the primary ecosystem-level stressors for green sturgeon and longfin smelt, rather than employing small scale project-level mitigation. In particular, an integrated regional restoration and monitoring program may be the most effective approach to improve the health of the species.

Supporting sustainable groundwater management

California Agriculture (UCANR) | March 13th, 2018

Implementation of the 2014 Sustainable Groundwater Management Act is on schedule. The first phase, completed in 2017, created a new layer of local government —

Implementation of the 2014 Sustainable Groundwater Management Act is on schedule. The first phase, completed in 2017, created a new layer of local government — groundwater sustainability agencies. Now, these new agencies must prepare groundwater sustainability plans. These plans will lay out a basic reckoning for every overdrafted basin: without additional water to replace groundwater pumping or to recharge aquifers, there will be less available to produce food, supply homes and businesses, and ensure there is enough water for the environment.

Surveillance and Monitoring Program (SAMP) Revised Final Report

Central Valley Salinity Alternatives for Long-Term Sustainability (CV-SALTS) | December 1st, 2016

Among other things, the State Recycled Water Policy (SRWP) requires that development of the Salt and Nitrate Management Plan (SNMP) include the following element (S

Among other things, the State Recycled Water Policy (SRWP) requires that development of the Salt and Nitrate Management Plan (SNMP) include the following element (SRWP Section 6.b.3 (a)): “A basin/sub‐basin wide monitoring plan that includes an appropriate network of monitoring locations. The scale of the basin/subbasin monitoring plan is dependent upon the sitespecific conditions and shall be adequate to provide a reasonable, cost‐effective means of determining whether the concentrations of salt, nutrients, and other constituents of concern as identified in the salt and nutrient plans are consistent with applicable water quality objectives.” Furthermore, “Salts, nutrients, and the constituents identified in paragraph 6(b)(1)(f) shall be monitored. The frequency of monitoring shall be determined in the salt/nutrient management plan and approved by the Regional Water Board pursuant to paragraph 6(b)(2).” This report describes the CV‐SALTS Surveillance and Monitoring Program (SAMP), which was developed to meet the monitoring requirements of the SRWP.

Sustainability of irrigated agriculture in the San Joaquin Valley, California

National Academy of Sciences (NAS) | October 25th, 2005

The sustainability of irrigated agriculture in many arid and semiarid areas of the world is at risk because of a combination of several interrelated factors, including

The sustainability of irrigated agriculture in many arid and semiarid areas of the world is at risk because of a combination of several interrelated factors, including lack of fresh water, lack of drainage, the presence of high water tables, and salinization of soil and groundwater resources. Nowhere in the United States are these issues more apparent than in the San Joaquin Valley of California. A solid understanding of salinization processes at regional spatial and decadal time scales is required to evaluate the sustainability of irrigated agriculture. A hydro-salinity model was developed to integrate subsurface hydrology with reactive salt transport for a 1,400-km2 study area in the San Joaquin Valley. The model was used to reconstruct historical changes in salt storage by irrigated agriculture over the past 60 years. We show that patterns in soil and groundwater salinity were caused by spatial variations in soil hydrology, the change from local groundwater to snowmelt water as the main irrigation water supply, and by occasional droughts. Gypsum dissolution was a critical component of the regional salt balance. Although results show that the total salt input and output were about equal for the past 20 years, the model also predicts salinization of the deeper aquifers, thereby questioning the sustainability of irrigated agriculture.