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A yellow sign that says Flooded is set at the side of a road with a vehicle parked on the washed out shoulder.

Wet Soils Increase Flooding During Atmospheric River Storms

By Elyse DeFranco | Jun 12, 2025 | Research findings

A new study examined decades of atmospheric river storms across the West Coast to pinpoint the conditions that lead to catastrophic flooding. The research, published June 4 in the Journal of Hydrometeorology, analyzed more than 43,000 atmospheric river storms across 122 watersheds on the West Coast between 1980 and 2023.

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Image of a flooded orchard with trees emerging from the water.

New Study Offers Detailed Look at Winter Flooding in California’s Central Valley

By Elyse DeFranco | Jun 10, 2025 | Research findings

The research used satellite imagery to identify where winter flooding occurs, which can improve flood risk awareness and inform how to best redirect floodwaters to replenish groundwater supplies.

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Water repellent soil after wildfire

Guo Yu Awarded Funding from USGS to Expand Research Examining Compounding Risks of Wildfires and Floods

By Paula Loop | Sep 10, 2024 | Announcements

Guo Yu, assistant research professor of hydrometeorology, along with collaborator Luke McGuire from the University of Arizona, received a three-year grant from the USGS Water Resources Research Act Program. The funding will be used to expand his work examining how repeated wildfires impact flooding risk in communities.

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Ariel photo of the flooded Saale River.

A Fresh Look at the Drivers of Extreme Flooding

By Elyse DeFranco | Apr 4, 2024 | News releases

A new study in Science Advances finds that compounding effects of flood drivers can complicate and exacerbate the risk of extreme floods in watersheds around the world. DRI’s Guo Yu, Ph.D., assistant research professor of hydrometeorology, co-authored the research.

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Photo of cars under water after a road to swept away during a flood with rescue crews in the background.

Preparing for the Floods That Follow the Fires

By Elyse DeFranco | Mar 18, 2024 | Featured projects

A conversation with Guo Yu and Jeremy Giovando about their new research examining post-fire flood frequency. The study expands on previous frameworks to account for the compounding impacts of repeated wildfires on flood risk, using a southern California watershed as a case study.

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Anne Heggli inside of a snowpit on Donner Pass.

A New Tool Can Help Protect California and Nevada Communities from Floods While Preserving Their Water Supply

By Elyse DeFranco | Feb 20, 2024 | Featured projects

DRI’s Anne Heggli is partnering with the National Weather Service to understand flood risk from rain-on-snow storms in real-time, protecting communities and enabling water conservation throughout Nevada and California.

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The Loyalton fire creeps down a hillside in Washoe County.

DRI Student Interns Explore Northern Nevada’s Natural Hazards

By Guadalupe Alvarez | Apr 3, 2023 | Blog, Featured researchers

In this story, we highlight the work of DRI interns Phillips Nguyen and Alexius Jessup-Raju, two students from Truckee Meadows Community College, as they explore natural hazards and their impacts on house ownership and aquatic environments.

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Las Vegas flooding street

A Changing Flood Recipe for Las Vegas

By DRI Communications | Jan 18, 2023 | Announcements, News releases

Researchers found that urbanization and climate change are changing the strength and seasonality of flooding in the Las Vegas region.

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Truckee River after storm

Study Explores Uncertainties in Flood Risk Estimates

By DRI Communications | Jun 14, 2022 | Announcements, News releases

In a new study, Guo Yu, Ph.D., examined the most common drivers (rainfall, snowmelt, and rain-on-snow events) of historic floods and investigated the impact of different flood types on the resulting flood frequencies.

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Working to solve our most challenging environmental problems.

More than 600 highly-skilled scientists, engineers, technicians, students, and staff work collaboratively within and across four research divisions focused on understanding and answering critical science questions about changes in the environment, water quality and availability, air quality, the sustainability of desert lands, life in extreme environments, education, and more.

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