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Daniel M. Wagner and Brandon T. Anderson develop estimates of flood magnitude and frequency for urban streams in Alabama and Mississippi. Drawing on annual peak flows through the 2024 water year, the report connects measurements at existing streamgages with methods for estimating flood flows at places without a gage.
The analysis examines 64 urban streamgages and uses a subset of 42 to develop regional regression equations. Drainage area and the proportion of developed land emerge as the explanatory variables used to estimate flows associated with selected annual exceedance probabilities.
Methods, tables and measures of prediction uncertainty accompany the resulting equations. The report explains the data and analytical setting needed to interpret those estimates, making it useful for readers interested in urban hydrology, flood frequency analysis and the relationship between watershed development and streamflow. Its emphasis is on a defined regional dataset and the statistical estimation of uncommon high-flow events.