Introduction
Reliable estimates of the magnitude and frequency of floods are essential
for the design of transportation and water-conveyance structures, flood insurance
studies, and flood-plain management. Flood-frequency estimates are particularly
important in densely populated urban areas. The U.S. Geological Survey (USGS) used
a multistate approach to update methods for determining the magnitude and frequency
of floods in urban and small, rural streams that are not substantially affected
by regulation or tidal fluctuations in Georgia, South Carolina, and North Carolina
(Feaster and others, 2014). The multistate approach has the advantage over a single
state approach of increasing the number of streamflow-gaging station (streamgages)
available for analysis, expanding the geographical coverage that would allow
for application of regional regression equations across state boundaries, and
building on a previous flood-frequency investigation of rural streamgages in
the Southeastern United States. This investigation was funded as part of a
cooperative program of water-resources investigations between the USGS, the
South Carolina Department of Transportation, and the North Carolina Department
of Transportation. In addition, much of the data and information for the
Georgia streamgages was funded through a similar cooperative program with
the Georgia Department of Transportation.
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First posted March 27, 2014
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