Variability and trends in water-year runoff efficiency (RE) — computed as the ratio of water-year runoff (streamflow per unit area) to water-year precipitation — in the conterminous United States (CONUS) are examined for the 1951 through 2012 period. Changes in RE are analyzed using runoff and precipitation data aggregated to United States Geological Survey 8-digit hydrologic cataloging units (HUs). Results indicate increases in RE for some regions in the north-central CONUS and large decreases in RE for the south-central CONUS. The increases in RE in the north-central CONUS are explained by trends in climate, whereas the large decreases in RE in the south-central CONUS likely are related to groundwater withdrawals from the Ogallala aquifer to support irrigated agriculture.
Additional publication details
|Publication Subtype||Journal Article|
|Title||Variability and trends in runoff efficiency in the conterminous United States|
|Series title||Journal of the American Water Resources Association|
|Contributing office(s)||National Research Program - Central Branch|
|Online Only (Y/N)||N|
|Additional Online Files (Y/N)||N|