Water Resources of the United States

USGS Flood Information   

The USGS provides practical, unbiased information about the Nation's rivers and streams that is crucial in mitigating hazards associated with floods. This site provides information about the USGS activities, data, and services provided during regional high-flow events, such as hurricanes or multi-state flooding events. The USGS response to these events is typically managed by the National Floods Specialist.

Photos of USGS indirect measurement survey

Indirect Flood Measurement

Policies, methods, and information regarding indirect flood measurements by the USGS.


Contracted Openings

Critical Depth


Dams and Weirs

Roughness value estimation

Slope Area Method

Slope Conveyance Method

For questions related to this site or to contribute content, please email Todd Koenig or Bob Holmes at the USGS Office of Surface Water.

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