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Fact Sheet

Floods in California

By Jeffrey Mount, Gokce Sencan, Letitia Grenier

More than seven million Californians—one in five residents—live in areas at risk of flooding, and risks are growing. Improved land use planning, insurance, and innovative flood management can help.

blog post

Making Sense of the Floods in San Diego

By Sarah Bardeen

The sudden deluge in San Diego last week has left some of that city’s communities reeling. But what actually caused the epic flooding—and could it have been avoided? We ask the experts.

Report

Priorities for California’s Water

By Jeffrey Mount, Letitia Grenier, Ellen Hanak, Caitlin Peterson ...

California has made great strides in preparing for a drier, hotter future, but it remains a challenge to harness the bounty of wet years while also reducing flood risk. How did California’s water sector manage the unusually wet 2023 water year—and what lessons can we glean for the future?

Report

Managing Water and Farmland Transitions in the San Joaquin Valley

By Ellen Hanak, Andrew Ayres, Caitlin Peterson, Alvar Escriva-Bou ...

How can the San Joaquin Valley adapt to a future with less water? We’ve been researching this issue for the past seven years, and our new report presents highlights from we’ve learned, including a robust list of policy suggestions to help the valley weather—and make the most of—the coming changes.

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Surplus and Shortage: California’s Water Balancing Act

As climate change accelerates, it’s bringing more extreme weather to California: The dry periods are hotter and drier than ever before—and the wet periods can be torrential. The only certainty is that water managers at every level will have to plan for and respond to extremes. How can we cope with the increasing volatility of our water cycle? We bring together three panels of experts to find out.

Report

Solar Energy and Groundwater in the San Joaquin Valley

By Andrew Ayres, Annabelle Rosser, Ellen Hanak, Alvar Escriva-Bou ...

Hundreds of thousands of acres of irrigated farmland may come out of production in the San Joaquin Valley in coming decades. At the same time, the state needs to ramp up renewable energy generation to meet climate goals. Could solar development on fallowed land help the valley’s residents? Our new report examines the challenges and opportunities.

Report

Land Transitions and Dust in the San Joaquin Valley

By Andrew Ayres, Jaymin Kwon, Joy Collins

Agricultural operations and wind erosion are two of the largest sources of dust in the San Joaquin Valley, and the valley’s air quality may decline with increased farmland fallowing and a warmer, drier climate. This will impact low-income, rural communities first and foremost, but proactive management can help identify high-risk areas and direct funding to cost-effective interventions.

Policy Brief

Policy Brief: Tracking Where Water Goes in a Changing Sacramento–San Joaquin Delta

By Greg Gartrell, Jeffrey Mount, Ellen Hanak

The Sacramento–San Joaquin Delta supplies water to roughly 30 million Californians, over 6 million acres of farmland, and countless ecosystems. But the watershed’s climate is changing: recent decades have seen record warmth, higher evaporation, and declining snowpack. We track where the water is going—and how to adapt.

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