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Methods of estimating flood magnitudes for recurrence intervals of 1.5, 2, 5, 10, 25, 50, 100, 200, and 500 years
have been developed for rural streams in Alabama that are not affected by regulation or urbanization. Regression
relations were developed using generalized least-squares regression techniques to estimate flood magnitude and
frequency on ungaged streams as a function of the drainage area of a basin. These methods are based on flood-frequency
characteristics for 170 gaging stations in Alabama having 10 or more years of record through September 2003. Graphical
relations of peak flows to drainage areas are also presented for sites along the Alabama, Coosa, Tallapoosa, and
Tombigbee Rivers. Equations for estimating flood magnitudes on ungaged urban streams (taken from a previous report)
that use drainage area and percentage of impervious cover as independent variables are also made available.
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