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.

Indirect Measurement Methods

Related information

Contracted Openings

Critical Depth

  • Barnes, H.H., Jr., and Davidian, J., 1978, Indirect methods in hydrometry, in Herschy, R.W., ed. Hydrometry: New York, John Wiley and Sons, p. 149-204.
  • C-D Checklist: : Critical Depth review checklist (.docx): A starting point for checking/reviewing critical depth indirect measurement computations.

Culverts

Dams and Weirs

Slope Area Method

Slope Conveyance Method

  • Barnes, H.H., Jr., and Davidian, J., 1978, Indirect methods in hydrometry, in Herschy, R.W., ed. Hydrometry: New York, John Wiley and Sons, p. 149-204.

General

High-Water Marks

Roughness value estimation

Reporting


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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