Abstract

Flood frequency curves for all gaged sites in the United States that have at least 10 years of recorded natural (unregulated) streamflow discharges are available for inspection at district offices of the U.S. Geological Survey's Water Resources Division. Over 11,000 sites on streams and rivers in all 50 states are available through the program.By establishing how frequently a particular flood flow is likely to be equaled or exceeded at least once on the long‐term average, flood frequency curves are used by public and private agencies for design purposes and to determine, for example, insurance rates and flood zone regulations.

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