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Data Supplement to Development and Evaluation of the Beta Streamflow Duration Assessment Method (SDAM) for the Great Plains (GP)
Citation:
Eddy, M., S. Gross, K. Fritz, B. Topping, Tracie-Lynn Nadeau, R. Edgerton, AND J. Kelso. Data Supplement to Development and Evaluation of the Beta Streamflow Duration Assessment Method (SDAM) for the Great Plains (GP). U.S. Environmental Protection Agency, Washington, DC, EPA/840/R-22/003, 2022.
Impact/Purpose:
Flow duration classification is used to implement several federal, state and local stream management programs. Because the flow duration of streams via existing maps, remote sensing, and gauging is constrained, field-based tools are often needed by practitioners. The manual describes a beta method to rapidly classify stream reaches as ephemeral, intermittent, perennial, and at-least intermittent in the Northern and Southern Great Plains of the United States.
Description:
The data supplement is a companion document to the user manual for the beta Streamflow Duration Assessment Method for the Great Plains (beta SDAM GP) of the United States. The beta SDAM GP is a field-based method for rapidly classifying stream reaches as perennial, intermittent, at-least intermittent, or ephemeral. This data supplement details the data collection, data analysis, and evaluation steps that were used to develop the beta SDAM GP. Four biological, four geomorphological, and one geographical indicator form the basis of the GP beta SDAM. The accuracy of the beta SDAM GP for classifying ephemeral, intermittent and perennial reaches was 81% and 68% in the training and testing data sets, respectively. The accuracy of the method for differentiating ephemeral from at least intermittent (perennial and intermittent) reaches increased to 89% and 87% in the training and testing data set, respectively.