Hydrologic extremes, whether periods of drought or flooding, are occurring more frequently with greater severity and can have substantial economic impacts. Along with flood- ing, the timing and volume of streamflow also is changing across the United States. The focus of this report is to charac- ter...

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Bibliographic Details

Main Author:	Norton, Parker A. (Author)
Format:	Electronic eBook
Language:	English
Published:	Reston, Virginia U.S. Geological Survey 2022
Series:	Scientific investigations report 2022-5055
Subjects:	Flusslauf Abflussregime North Dakota USA South Dakota Streamflow / South Dakota Streamflow / North Dakota Stream measurements / South Dakota Stream measurements / North Dakota Stream measurements Streamflow
Online Access:	Volltext
Summary:	Hydrologic extremes, whether periods of drought or flooding, are occurring more frequently with greater severity and can have substantial economic impacts. Along with flood- ing, the timing and volume of streamflow also is changing across the United States. The focus of this report is to charac- terize a unique trend in mean annual streamflow occurring in eastern North and South Dakota, hereafter referred to as the eastern Dakotas, that is not being observed anywhere else in the conterminous United States. Streamflow records for 1,853 U.S. Geological Survey streamgages obtained from the U.S. Geological Survey National Water Information System database with a continu- ous record of mean annual streamflow during water years 1960–2019 were included in this study. Using a Kendall tau statistical test (p-value less than or equal to 0.10), 573 streamgages had a statistically significant upward trend in mean annual streamflow and are primarily located in the Midwest and northeastern United States. Of the streamgages, 182 had a statistically significant downward trend and are located primarily in the western and southeastern States. Several sites had increases in streamflow between 100 and 500 percent. Most of the streamgages with the highest increases in mean annual streamflow are along the same rivers in the eastern Dakotas, regardless of basin size.
Physical Description:	1 Online-Ressource (IV, 11 Seiten) Illustrationen, Diagramme, Karten#