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Limitations of flood-frequency estimation techniques

The following limitations apply to the use of the regional flood-frequency relations presented on this Web site: the relations are valid only for ungaged sites where the drainage area is between the minimum and maximum discharge area for the appropriate regions listed below: Region 1: 0.17 to 730 mi2 Region 2: 0.10 to 3,000 mi2 Region 3: 0.14 to 3,000 mi2 Region 4: 0.25 to 2,000 mi2 the regional relations do not apply to the mainstems of the Ocmulgee, Oconee, Altamaha, and Flint Rivers lying in region 3. Station flood-frequency relations for these large rivers are presented in the section entitled "Flood Frequency for Large Streams" of USGS report WRIR 93-4016; the relations are not valid for streams affected by regulation from dams or diversions, by substantial channelization; the relations are not valid for tidally affected streams; the relations are not valid for drainage areas in the Okefenokee Swamp where the magnitude and frequency relations are undefined; the relations are not valid for streams in urban areas unless the effects of urbanization are insignificant (for sites in urban areas, use methods described by Inman, in "Flood-frequency relations for urban streams in Georgia: U.S. Geological Survey Water-Resources Investigations Report 88-4085"; the relations are not valid for areas in southwest Georgia where large limestone sink holes or depressions can affect the flood-frequency relation. for sites draining more than one region, use this method, or refer to USGS Water-Resources Investigations Report 93-4016

Home | USGS Water Resources of Georgia Select site by: Site number | Site name | County | Area | Region Ungaged site information | Ungaged calculator | Two-region calculator | Limitations This URL: http://nts4dgaatl.er.usgs.gov:80/floodfrequency/limitations.cfm Last updated: 11/28/2001 10:12:17 AM Note: Information and data on this Web site come from "Techniques for Estimating Magnitude and Frequency of Floods in Rural Basins of Georgia," USGS Water-Resources Investigations Report 93-4016, by Stamey, T.C., and Hess, G.W., 1993 USGS Privacy Statement || Disclaimer