Report on an Integrated Regional Water Management Plan for the San Joaquin Valley of California

U.S. Bureau of Reclamation (USBR) | May 1st, 2016

A major investment has been made through California voter-approved general obligation bonds to incentivize regional water infrastructure and management solutions that imp

A major investment has been made through California voter-approved general obligation bonds to incentivize regional water infrastructure and management solutions that improve self-sufficiency, reduce water use impacts and support environmental protection and restoration. The program, put into California water statutes in 2002, and managed by the California State Department of Water Resources (DWR), is called Integrated Regional Water Management Planning (IRWMP). This planning tool, along with other water management strategies, actions and activities that have emerged, were ultimately intended to be elevated to an aggregate effort for the entire San Joaquin Valley into a Valley-wide integrated water plan. The aggregate effort was included as a goal in federal legislation (PL 111-11, Section 10101). The legislation included funding for the California Water Institute (CWI) at California State University, Fresno to prepare a report on the Valley-wide activities.

Rethinking Management of the Colorado River through Lake Powell, Grand Canyon, and Lake Mead

Utah State University | November 15th, 2024

Royce Tipton and the Hydrology of the 1944 Treaty with Mexico

John Fleck | May 26th, 2025

Safe Clean Water Water for Los Angeles County Residents

Los Angeles County Department of Public Works (LACDPW) | November 7th, 2017

We live in a water-scarce area, and forces outside of our control can threaten our local water resources, including lakes, rivers and beaches. LA Count

We live in a water-scarce area, and forces outside of our control can threaten our local water resources, including lakes, rivers and beaches. LA County residents rely heavily on imported water from the Sierra Mountains, the Central Valley and even from states as far away as Colorado. Climate change is causing more and more extreme weather conditions, making these remote sources more unreliable . The impacts of the recent five-year drought were widely felt here. Rainfall is an essential, local source of LA’s water . Rain runs through local rivers, creeks and streams and can be absorbed underground, replenishing groundwater, which is a local source of drinking water. However, because so much of our region is paved over, when we do experience heavy rain, too much of that precious water is lost to the ocean before we can capture it for use. Our local water resources are also threatened by toxins and pollution as stormwater runs through streets and over-paved areas into our rivers, creeks and streams. Pollution flows onto our beaches and into the ocean, posing a public health risk and harming marine life.

Salinas River Watershed Area Salt Modeling

California Central Coast Regional Water Quality Control Board (CCRWQCB) | November 13th, 2015

Tetra Tech supported EPA Region 9 and the Central Coast Regional Water Quality Control Board (CCRWQCB) for an assessment of salt impairments and development of a

Tetra Tech supported EPA Region 9 and the Central Coast Regional Water Quality Control Board (CCRWQCB) for an assessment of salt impairments and development of a salt mass balance in the Lower Salinas River and Reclamation Canal watersheds. This effort can inform development of salt-related TMDLs by the CCRWQCB and a salt and nutrient management plan for the Salinas Valley aquifers. Three reaches have reported 2010 303(d) listings for salt-related impairments in these watersheds including impairments due to chloride, sodium, electrical conductivity, and total dissolved solids – Lower Salinas River, Santa Rita Creek, and Alisal Creek. This report provides data analysis and a literature review (Sections 1 through 5), development of a water and salt mass balance tool (Sections 6 through 8), and salt source assessment (Section 9). The results of the analysis provide a strong foundation for assessing salt sources and understanding salt mass balance in the study area, but can be improved with refined representation of cropland locations, rotations, and irrigation practices.

Science be Dammed: How Ignoring Inconvenient Science Drained the Colorado River

University of Arizona Press | November 26th, 2019

Science Be Dammed is an alarming reminder of the high stakes in the management—and perils in the mismanagement—of water in the western United States.  It seems decep

Science Be Dammed is an alarming reminder of the high stakes in the management—and perils in the mismanagement—of water in the western United States.  It seems deceptively simple: even when clear evidence was available that the Colorado River could not sustain ambitious dreaming and planning by decision-makers throughout the twentieth century, river planners and political operatives irresponsibly made the least sustainable and most dangerous long-term decisions. Arguing that the science of the early twentieth century can shed new light on the mistakes at the heart of the over-allocation of the Colorado River, authors Eric Kuhn and John Fleck delve into rarely reported early studies, showing that scientists warned as early as the 1920s that there was not enough water for the farms and cities boosters wanted to build. Contrary to a common myth that the authors of the Colorado River Compact did the best they could with limited information, Kuhn and Fleck show that development boosters selectively chose the information needed to support their dreams, ignoring inconvenient science that suggested a more cautious approach. Today water managers are struggling to come to terms with the mistakes of the past. Focused on both science and policy, Kuhn and Fleck unravel the tangled web that has constructed the current crisis. With key decisions being made now, including negotiations for rules governing how the Colorado River water will be used after 2026, Science Be Dammed offers a clear-eyed path forward by looking back. Understanding how mistakes were made is crucial to understanding our contemporary problems. Science Be Dammed offers important lessons in the age of climate change about the necessity of seeking out the best science to support the decisions we make.

Securing Color River Supplies - An Urban-Agriculture Partnership in the Palo Verde Valley

Metropolitan Water District of Southern California (MWD) | March 16th, 2022

Stakeholder Perspectives: Recommendations for Sustaining and Strengthening Integrated Regional Water Management

California Department of Water Resources (DWR) | ?

Integrated regional water management (IRWM) is the application of integrated water management principles at the regional level. IRWM brings local agencies and other stak

Integrated regional water management (IRWM) is the application of integrated water management principles at the regional level. IRWM brings local agencies and other stakeholders, with a range of water-related roles and interests, together to address water management needs collaboratively within self-identified regions accepted by the State. The practice of IRWM is rooted in the principle of regional control, recognizing that local and regional water managers and other stakeholders, working together in a collaborative, open, and transparent manner, are best suited and best positioned to manage water resources in their regions. Issues including limited groundwater and surface water supplies, drought, flooding, climate change, water quality, environmental degradation, aging infrastructure, economic constraints, recreation, and cultural considerations are addressed through coordinated and integrated actions.

State Climate Policy and Nature-based Solutions: A Match that Provides Multiple Benefits for Climate, Water, and More

Stanford University | August 17th, 2022

This report examines potential synergies between state climate policies and nature-based solutions that yield multiple benefits; outlines barriers to meeting that potenti

This report examines potential synergies between state climate policies and nature-based solutions that yield multiple benefits; outlines barriers to meeting that potential; and provides recommendations to accelerate the implementation of nature- based solutions with water benefits in state climate policies. It is not meant to be exhaustive, but to point out areas for further productive work. The audience is non-climate water practitioners working in the Colorado River Basin and state climate policy practitioners who may not be familiar with the opportunities nature-based solutions (NBS) provide for both climate and water. As a result, the report can be considered something of a primer or resource, including basic information about both fields to educate water practitioners as to what state climate plans entail, and to educate climate practitioners about the opportunity to include (and the necessity of including) NBS as part of their climate planning. The report’s intent is to illuminate an area where further engagement and technical work can help seize an opportunity to meet the climate and water challenges facing the Colorado River Basin states.

Strategic Plan for the Future of Integrated Regional Water Management in California: Review of IRWM Planning and Implementation in California

California Department of Water Resources (DWR) | February 20th, 2015

Integrated Regional Water Management (IRWM) has become a water management standard throughout most of California following passage of the 2002 IRWM Planning Act (SB 1672)

Integrated Regional Water Management (IRWM) has become a water management standard throughout most of California following passage of the 2002 IRWM Planning Act (SB 1672). The dedicated efforts of regional water management groups and the support of state bond funds have resulted in 48 IRWM regions identifying and implementing integrated regional water management solutions to improve public safety, foster environmental stewardship, and support economic stability throughout the state. Under the principles of IRWM, individuals and agencies have built strong working relationships, identified regional water management needs, and defined crucial steps to meet those needs together.  IRWM is essential for California's future and is a key part of the California Water Action Plan. As the Department of Water Resources works with its partners to produce a Strategic Plan for the Future of IRWM in California (Strategic Plan), we have surveyed the IRWM landscape to identify key characteristics and trends in IRWM planning and implementation. Survey results were presented to stakeholders at the second round of Strategic Plan development workshops in October and November 2013 and subsequently updated to reflect IRWM planning and implementation efforts as of October 2014. These updated results, along with additional information, are presented in this technical memorandum. Please visit the Strategic Plan website at http://www.water.ca.gov/irwm/stratplan/ to learn more about the Strategic Plan development effort. For more information about the California Water Action Plan, please visit http://resources.ca.gov/docs/california_water_action_plan/ Final_California_Water_Action_Plan.pdf.