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GEOPHYSICAL RESEARCH LETTERS,
VOL. 29, NO. 24,
2185,
doi:10.1029/2002GL015999,
2002
A step increase in streamflow in the conterminous United States
Gregory J. McCabe
U.S. Geological Survey,
Denver,
Colorado,
USA
David M. Wolock
U.S. Geological Survey,
Lawrence,
Kansas,
USA
Abstract
Annual minimum, median, and maximum daily streamflow for 400 sites in the conterminous United States (U.S.), measured during
1941–1999, were examined to identify the temporal and spatial character of changes in streamflow statistics. Results indicate
a noticeable increase in annual minimum and median daily streamflow around 1970, and a less significant mixed pattern of increases
and decreases in annual maximum daily streamflow. These changes in annual streamflow statistics primarily occurred in the
eastern U.S. In addition, the streamflow increases appear as a step change rather than as a gradual trend and coincide with
an increase in precipitation.
Published 24
December
2002.
Index Terms: 1860 Hydrology: Runoff and streamflow; 1833 Hydrology: Hydroclimatology; 1699 Global Change: General or miscellaneous.
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Citation: McCabe, G. J., and D. M. Wolock
(2002),
A step increase in streamflow in the conterminous United States,
Geophys. Res. Lett.,
29(24),
2185,
doi:10.1029/2002GL015999.
This paper is not subject to U.S. copyright. Published in 2002 by the
American Geophysical Union.
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