WASHINGTON, Aug. 5 (TNSLrpt) -- The U.S. Geological Survey (USGS) has released a new report, "Nonstationary Flood Frequency Analysis Using Regression in the North-Central United States," which introduces an extension of a method for flood frequency analysis (FFA). The report, authored by Sara B. Levin, is designated as Scientific Investigations Report 2025-5034 and was prepared in cooperation with the departments of transportation and natural resources of nine states: Illinois, Iowa, M . . .

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