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2024 Annual Multibenefit Land Repurposing Program Report

California Department of Conservation (CDoC) | May 29th, 2025

Summary

The Multibenefit Land Repurposing Program (MLRP) increases regional capacity for repurposing irrigated agricultural land to uses that reduce reliance on groundwater while

The Multibenefit Land Repurposing Program (MLRP) increases regional capacity for repurposing irrigated agricultural land to uses that reduce reliance on groundwater while providing community health, economic well-being, water supply, habitat, renewable energy, and climate benefits. The program provides funding for regional block grants, tribal grants, and a Statewide Support Entity to provide technical assistance to block grantees and support progress toward program goals.

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A case study of canal seepage quantification using gain/loss method and electrical resistivity tomography in an intensively managed water resource system in the Treasure Valley, Idaho, United States

Elsevier | November 12th, 2024

Summary

Monitoring groundwater-surface water (GW-SW) interactions is essential for effectively managing the available water resources in semi-arid and arid environments. The focu

Monitoring groundwater-surface water (GW-SW) interactions is essential for effectively managing the available water resources in semi-arid and arid environments. The focus of this study was to quantify how much SW is being exchanged with the shallow GW aquifer in the Treasure Valley (TV), Idaho, USA. Previous water budgets estimated regional canal seepage without incorporating canal variability and flow measurement uncertainty. To address this, we applied both direct (gain/loss) and indirect (electrical resistivity tomography (ERT)) techniques. Direct seepage measurements were taken on canals capturing a range of different characteristics in the TV. The discrete measurements were then used to estimate the total seepage anticipated to be lost from these canals during the irrigation season. Our findings showed high seepage variability across the canals. The ERT inversion approach was utilized before and after the irrigation season by applying an advanced inversion scheme to better constrain the canal seepage spatial variability and uncertainty by quantifying changes in the saturated zone with 2D-ERT results. Temporal changes in the subsurface resistivity were observed due to the lateral flow from the nearby surface canal during the irrigation season. The combination of these approaches improves our understanding of SW-GW interactions in intensively managed irrigation systems.

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A database of groundwater wells in the United States

Nature Portfolio (Springer Nature) | April 4th, 2024

Summary

Groundwater wells are critical infrastructure that enable the monitoring, extraction, and use of groundwater, which has important implications for the environment, water

Groundwater wells are critical infrastructure that enable the monitoring, extraction, and use of groundwater, which has important implications for the environment, water security, and economic development. Despite the importance of wells, a unified database collecting and standardizing information on the characteristics and locations of these wells across the United States has been lacking. To bridge this gap, we have created a comprehensive database of groundwater well records collected from state and federal agencies, which we call the United States Groundwater Well Database (USGWD). Presented in both tabular form and as vector points, USGWD comprises over 14.2 million well records with attributes, such as well purpose, location, depth, and capacity, for wells constructed as far back as 1763 to 2023. Rigorous cross-verification steps have been applied to ensure the accuracy of the data. The USGWD stands as a valuable tool for improving our understanding of how groundwater is accessed and managed across various regions and sectors within the United States.

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A real-time groundwater management model using data assimilation

American Geophysical Union (AGU) | June 30th, 2011

Summary

We apply the proposed management model to the Aquifer Storage and Recovery (ASR) Project of the Las Posas Groundwater Basin in southern California. The adapted nudging al

We apply the proposed management model to the Aquifer Storage and Recovery (ASR) Project of the Las Posas Groundwater Basin in southern California. The adapted nudging algorithm is used to estimate the missing pumping rates of private wells. We then use the estimated pumping rates in a real-time groundwater management model to improve management decisions of the ASR well fields.

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Anderson-Cottonwood Irrigation District Integrated Regional Water Management Program – Groundwater Production Element Project

U.S. Bureau of Reclamation (USBR) | August 15th, 2011

Summary

This project would improve the flexibility and reliability of the District’s water supply, particularly during dry and critically dry water years. In 2004, ACID’s sur

This project would improve the flexibility and reliability of the District’s water supply, particularly during dry and critically dry water years. In 2004, ACID’s surface water rights were reduced from 165,000 to 121,000 ac-ft per year as part of the renegotiation of the 40-year Settlement Contract. Furthermore, the west side of the District’s system has little to no downstream control. Control of the system is achieved at the head of the 35-mile main canal, causing some delivery difficulties at the downstream end of the service area. By pushing water from upstream to downstream without an ability to manage intermediate water surface elevations, downstream response time to water delivery needs can be greatly hindered. This project would help with the flexibility and reliability required to meet agricultural water needs.

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Arsenic, chromium, uranium, and vanadium in rock, alluvium, and groundwater, Mojave River and Morongo Areas, western Mojave Desert, southern California

U.S. Geological Survey (USGS) | October 16th, 2023

Summary

Trace elements within groundwater that originate from aquifer materials and pose potential public-health hazards if consumed are known as geogenic contaminants. The geoge

Trace elements within groundwater that originate from aquifer materials and pose potential public-health hazards if consumed are known as geogenic contaminants. The geogenic contaminants arsenic, chromium, and vanadium can form negatively charged ions with oxygen known as oxyanions. Uranium complexes with bicarbonate and carbonate to form negatively charged ions having aqueous chemistry similar to oxyanions. The concentrations of arsenic, chromium, uranium, and vanadium in groundwater result from the combined effects of (1) geologic abundance within aquifer materials; (2) the fraction of these elements that have weathered from and sorbed to the surfaces of mineral grains and are potentially available to groundwater; and (3) the aqueous chemistry of dissolved oxyanions in groundwater during different redox conditions and pH, both of which are affected by hydrogeology, including the length of time groundwater has been in contact with aquifer materials. Concentrations of arsenic, chromium, uranium, and vanadium were measured in samples of (1) rock, surficial alluvium, and drill cuttings using portable (handheld) X-ray fluorescence (pXRF); (2) operationally defined fractions extractable from these materials; and (3) water from wells sampled between 2000 and 2018 within the 3,500 square mile Mojave River area and Morongo area of the western Mojave Desert, southern California.

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Best Management Practices of the Sustainable Management of Groundwater: Land Subsidence (Draft)

California Department of Water Resources (DWR) | July 23rd, 2025

Summary

For almost a century, parts of California have been gradually sinking, impacting critical infrastructure and the communities who rely on it. Recognizing this challenge, t

For almost a century, parts of California have been gradually sinking, impacting critical infrastructure and the communities who rely on it. Recognizing this challenge, the Department of Water Resources has released a draft Best Management Practices document for public comment that will help local water agencies address this growing concern and support groundwater reliant communities. Click here for the full DWR press release.

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Bulletin 118 - California's Groundwater Update 2013

California Department of Water Resources (DWR) | April 15th, 2015

Summary

California’s Groundwater Update 2013 compiles and analyzes readily available groundwater information to characterize California’s groundwater basins, aquifers, and we

California’s Groundwater Update 2013 compiles and analyzes readily available groundwater information to characterize California’s groundwater basins, aquifers, and well infrastructure. It also presents data and analysis related to groundwater monitoring efforts, aquifer conditions in response to extraction, groundwater management practices, and conjunctive management programs. It expands and enhances baseline groundwater information on a regional scale, identifies challenges associated with sustainable groundwater management, and helps guide implementation of diverse resource management strategies. The set of data, information, and analysis developed can help local and regional groundwater managers, as well as individual well owners, better understand California’s hidden and commonly misunderstood resource. This Bulletin has been uploaded in the following separate files reflecting hydrologic regions and appendices. Chapter One / Introduction Chapter Two / State-wide Update Chapter Three / North Coast Chapter Four / San Francisco Bay Chapter Five / Central Coast Chapter Six / South Coast Chapter Seven / Sacramento River Chapter Eight / San Joaquin River Chapter Nine / Tulare Lake Chapter Ten / North Lahontan Chapter Eleven / South Lahontan Chapter Twelve / Colorado River Appendix A: Methods and Assumptions Appendix B: CASGEM Basin Prioritization Appendix C: Groundwater Use Data 2010-2015 Appendix D: Conjunctive Management Survey Appendix E: Change in Groundwater in Storage Appendix F: Subsidence

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Bulletin No. 84 Mojave River Ground Water Basins Investigation

California Department of Water Resources (DWR) | August 15th, 1967

Summary

Click here for Bulletin No. 84 maps and plates.

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California Department of Water Plan 2023: Navigating Climate Challenges with Equity and Resilience

California Department of Water Resources (DWR) | September 20th, 2023

Summary

The California Water Plan (Water Plan), updated every five years, is the State’s strategic plan for sustainably and equitably managing, developing, and stewarding water

The California Water Plan (Water Plan), updated every five years, is the State’s strategic plan for sustainably and equitably managing, developing, and stewarding water resources. Required by Water Code Section 10005, the plan presents the status and trends of California’s water-dependent natural resources; water supplies; and agricultural, urban, and environmental water demands for a range of plausible future scenarios.

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Type

Best Management Practice (1)
Book/Textbook (4)
Bulletin (2)
Bulletin 118 (10)
California Water Plan (3)
Environmental Documents (2)
Fact sheet (1)
Handbook/Guide (2)
Journal Article (15)
magazine (1)
Model (4)
NGO Position Paper (1)
Policy (1)
Report (13)
Science Panel Report (1)
Strategy (2)
Technical Report (3)

Topic

Adaptive Management (1)
Agriculture (10)
Basic Information (1)
Climate Change (12)
Drinking Water (4)
Drought & Hydrology (7)
Ecosystem & Species Management (4)
Estuary News (2)
Flood Management (3)
Geochemistry (1)
Geochemistry (5)
Geohydrology (3)
Geohydrology (21)
Groundwater (55)
Infrastructure (3)
Integrated Regional Water Management (3)
Modeling (11)
Planning & Management (14)
Policy (1)
Pollutants (3)
Sacramento-San Joaquin Delta (6)
Salinity (2)
Science Management (1)
Storage (3)
Stormwater (1)
Transfers & Markets (1)
Tribal Water Issues (3)
Upper Watershed Management (4)
Water Project Operations (2)
Water Quality (8)
Water Quality Monitoring (1)
Water Rights, Water Law (1)
Water Supply (23)
Water Use & Efficiency (2)

Keywords

agricultural drainage (1)
agriculture (5)
agriculture water use and efficiency (2)
atmospheric rivers (1)
basin characterization (5)
California Water Plan (2)
Central Valley (3)
Central Valley Project (CVP) (1)
climate change (11)
coastal aquifers (4)
Colorado River (2)
conjunctive use (1)
desalination (1)
drinking water (3)
drought (4)
ecosystem management (4)
environmental justice (1)
Estuary News (2)
fisheries (1)
flood management (5)
groundwater (61)
Groundwater Exchange (21)
groundwater pumping impacts (3)
groundwater recharge (3)
groundwater-surface water interaction (2)
habitat restoration (1)
Integrated Regional Water Management (1)
irrigation (2)
land use (5)
managed aquifer recharge (MAR) (1)
modeling (10)
monitoring (5)
nitrates (1)
nutrients (1)
outreach and engagement (1)
pesticides (1)
planning and management (5)
pollutants (4)
risk assessment (2)
Sacramento–San Joaquin Delta (6)
salinity (3)
sea level rise (2)
seawater intrusion (1)
snowpack (2)
State Water Project (SWP) (1)
storage (3)
stormwater (1)
subsidence (4)
Sustainable Groundwater Management Act (SGMA) (13)
tribal water issues (1)
upper watershed management (3)
urban water conservation (1)
water and energy (1)
water markets (1)
water project operations (1)
water quality (8)
water supply (21)
water supply forecasting (2)

Publisher

American Association for the Advancement of Science (AAAS) (2)
American Chemical Society (ACS) (1)
American Geophysical Union (AGU) (8)
American Meteorological Society (AMS) (1)
California Department of Conservation (CDoC) (2)
California Department of Water Resources (DWR) (17)
Elsevier (1)
Environmental Research Letters (IOP) (2)
Local Agency Formation Commission of Orange County (1)
Multidisciplinary Digital Publishing Institute (MDPI) (1)
Napa County (3)
Nature Portfolio (Springer Nature) (4)
Public Policy Institute of California (PPIC) (3)
San Francisco Estuary Partnership (SFEP) (2)
State of California (1)
The White House (1)
U.S. Bureau of Reclamation (USBR) (2)
U.S. Geological Survey (USGS) (8)
UnIversity of California, Davis (UC Davis) (1)

Basin

Alexander Valley - Alexander Area 1-054.01 (1)
Alexander Valley - Cloverdale Area 1-054.02 (1)
Antelope Valley 6-044 (1)
Calzona Valley 7-041 (1)
Chuckwalla Valley 7-005 (1)
Coastal Plain of Los Angeles - Central 4-011.04 (1)
Coastal Plain of Orange County 8-001 (1)
Corralitos - Pajaro Valley 3-002.01 (3)
Death Valley 6-018 (1)
Gilroy-Hollister Valley - Llagas Area 3-003.01 (1)
Gilroy-Hollister Valley - North San Benito 3-003.05 (1)
Knights Valley 1-050 (1)
Las Posas Valley 4-008 (1)
Lower Mojave River Valley 6-040 (4)
Lower Russian River Valley 1-060 (1)
McDowell Valley 1-056 (1)
Middle Mojave River Valley 6-041 (4)
Mono Valley 6-009 (2)
Morongo Valley 7-020 (1)
Napa-Sonoma Valley - Napa Valley 2-002.01 (3)
Napa-Sonoma Valley - Napa-Sonoma Lowlands 2-002.03 (3)
Napa-Sonoma Valley - Sonoma Valley 2-002.02 (3)
Ogilby Valley 7-035 (1)
Owens Valley - Fish Slough 6-012.02 (2)
Owens Valley 6-012.01 (2)
Pahrump Valley 6-028 (1)
Palo Verde Mesa 7-039 (1)
Palo Verde Valley 7-038 (1)
Potter Valley 1-051 (1)
Quien Sabe Point Valley 7-040 (1)
Race Track Valley 6-062 (1)
Red Pass Valley 6-024 (1)
Redding Area - Anderson 5-006.03 (2)
Redding Area - Bowman 5-006.01 (1)
Redding Area - Enterprise 5-006.04 (2)
Redding Area - Millville 5-006.05 (2)
Redding Area - South Battle Creek 5-006.06 (2)
Rhodes Hill Area 6-086 (1)
Rice Valley 7-004 (1)
Riggs Valley 6-023 (1)
Rose Valley 6-056 (1)
Sacramento Valley - Bend 5-021.53 (1)
Sacramento Valley - Butte 5-021.70 (1)
Sacramento Valley - Colusa 5-021.52 (1)
Sacramento Valley - Corning 5-021.51 (1)
Sacramento Valley - Los Molinos 5-021.56 (1)
Sacramento Valley - North American (5-021.64) (1)
Sacramento Valley - Red Bluff 5-021.50 (1)
Sacramento Valley - Solano 5-021.66 (1)
Sacramento Valley - South American 5-021.65 (1)
Sacramento Valley - South Yuba 5-021.61 (1)
Sacramento Valley - Sutter 5-021.62 (1)
Sacramento Valley - Vina 5-021.57 (1)
Sacramento Valley - Wyandotte Creek 5-021.69 (1)
Sacramento Valley - Yolo 5021.67 (1)
Salinas Valley - 180/400 Foot Aquifer 3-004.01 (2)
Salinas Valley - Forebay Aquifer 3-004.04 (2)
Salinas Valley - Monterey 3-004.10 (2)
San Felipe Valley 7-027 (1)
San Fernando Valley 4-012 (1)
San Gabriel Valley 4-013 (2)
San Jacinto 8-005 (1)
San Joaquin Valley - Chowchilla 5-022.05 (1)
San Joaquin Valley - Cosumnes (5-022.16) (1)
San Joaquin Valley - Delta-Mendota 5-022.07 (1)
San Joaquin Valley - East Contra Costa 5-022.19 (1)
San Joaquin Valley - Eastern San Joaquin 5-022.01 (1)
San Joaquin Valley - Kaweah 5-022.11 (3)
San Joaquin Valley - Kern 5-022.14 (1)
San Joaquin Valley - Kings 5-022.08 (1)
San Joaquin Valley - Madera 5-022.06 (2)
San Joaquin Valley - Merced 5-022.04 (3)
San Joaquin Valley - Modesto 5-022.02 (1)
San Joaquin Valley - Pleasant Valley 5-022.10 (1)
San Joaquin Valley - Tracy 5-022.15 (1)
San Joaquin Valley - Tulare Lake 5-022.12 (1)
San Joaquin Valley - Tule 5-022.13 (2)
San Joaquin Valley - Turlock 5-022.03 (3)
San Joaquin Valley - Westside 5-022.09 (3)
Sanel Valley 1-053 (1)
Santa Clara Valley - East Bay Plain 2-009.04 (1)
Santa Cruz Mid-County 3-001 (1)
Santa Rosa Valley - Healdsburg Area 1-055.02 (1)
Santa Rosa Valley - Santa Rosa Plain 1-055.01 (1)
Ukiah Valley 1-052 (1)
Upper Mojave River Valley 6-042 (4)
Upper Santa Ana Valley - Chino 8-002.01 (1)
Upper Santa Ana Valley - Cucamonga (8-002.02) (1)
Upper Santa Ana Valley - San Bernardino 8-002.06 (1)
Vidal Valley 7-042 (1)
Wilson Grove Formation Highlands 1-059 (1)

Hydrological Region

Central Coast (27)
Colorado River (22)
Lower Basin States and Mexico - Colorado River (3)
National (16)
North Coast (23)
North Lahontan (20)
Sacramento River (27)
San Francisco Bay (27)
San Joaquin River (28)
South Coast (27)
South Lahontan (26)
Tulare Lake (23)
Upper Basin States - Colorado River (5)

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