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thumbnail new Groundwater and Surface Water Relations in Sonoma County, California –USGS, in cooperation with the Sonoma County Water Agency and other local agencies and municipalities, released a hydrologic model for the Santa Rosa Plain that shows a decrease in groundwater levels in response to pumping, which in turn causes a reduction in groundwater discharge to streams, a reduction in groundwater evapotranspiration, and a reduction in groundwater storage in the Santa Rosa Plain watershed. The model was used to better understand aquifer conditions for water years 1976 to 2010, and to simulate different scenarios of groundwater and surface-water availability given a range of groundwater pumping and climate conditions. The study helps to improve understanding of the complex hydrology of the Santa Rosa Plain watershed, which is home to about half of the population of Sonoma County and help water decision makers plan for increased water demand in the face of population growth, and possible climate change in the region. (Press Release; Report)


thumbnail new New Groundwater Model Used to Manage Water Resources around Wichita, Kansas –USGS, in cooperation with the City of Wichita, developed a groundwater model to accurately track available water, account for water that is artificially recharged into the aquifer, and monitor the movement of chloride. The study began in 2009 to determine groundwater flow in the Wichita well field area, and chloride transport from the Arkansas River and Burrton oil field. The model helps to determine effects on groundwater from changes in well pumping, rainfall, and streamflow. Results from this study are available (Report; Press release)


thumbnail Groundwater Pumping Continues to Reduce Streamflow in the Verde Valley, Central Arizona –USGS, in cooperation with the Verde River Basin Partnership and the Town of Clarkdale, assessed streamflow of the Verde River—one of Arizona's largest streams with year-round flow, showing declines from 1910 to 2005 as the result of human stresses, primarily groundwater pumping. The study's findings suggest that streamflow reductions will continue and may increase in the future. (Press release; Report)


thumbnail Effects of Surface-Water Diversions on the Verde River, Central, Arizona –USGS, in cooperation with the Verde River Basin Partnership, the Town of Clarkdale, and Yavapai County, assessed groundwater contributions (or "base flow") to the Verde River in Central Arizona. Surveys were done to look at base flow at many locations over a short period of time along 51 river miles of the Verde River. The information was used to determine the effects of human alterations, such as gravity-fed ditch diversions, on flows in the Verde River through different seasons. (Full report)


thumbnail Effects of Pumping on Groundwater/Surface Water in East Central, Massachusetts –USGS, in cooperation with the Town of Framingham, Massachusetts assessed the effects of groundwater pumping from a glacial-sediment aquifer on surface water, including Cochituate Brook, the Sudbury River, Lake Cochituate, Dudley Pond, and adjoining wetlands. Groundwater and surface-water relations were simulated using the USGS MODFLOW-NWT model under current conditions and a variety of hypothetical pumping conditions, including hypothetical pumping at reactivated water supply wells. (Full report)


thumbnail Predicted effects of groundwater irrigation on stream flow in the Elkhorn and Loup River Basins, Nebraska –USGS, in cooperation with the Lewis and Clark, Lower Elkhorn, Lower Loup, Lower Platte North, Lower Niobrara, Middle Niobrara, Upper Elkhorn, and Upper Loup Natural Resources Districts, simulated groundwater underlying a 30,000-square-mile area of the High Plains aquifer (referred to collectively as the Elkhorn-Loup Model) to help estimate the effects of groundwater irrigation on stream base flow in the Elkhorn and Loup River Basins, Nebraska. Simulations described the stream-aquifer system from predevelopment through 2005 and future hypothetical development conditions (2006 through 2033 or 2055). Predicted changes to stream base flow that result from groundwater irrigation help in the development of strategies for water-supply management. (USGS Scientific Investigations Report 2010-5149)


thumbnail Groundwater flow and interactions with rivers and streams in the Yakima River Basin, Washington –USGS, in cooperation with the Washington State Department of Ecology, the Yakama Nation, and the Bureau of Reclamation, released a report and the first comprehensive groundwater flow model for the entire Yakima River. The new computer model simulates the groundwater system and its interaction with rivers and streams, incorporating information on hydrogeology, pumping, recharge, and flow, and integrating groundwater resource assessments done over the past 12 years. Some of this information was released in a series of earlier reports, and this thirteenth report in the series documents the model and various scenarios simulating conjunctive management of groundwater and surface-water resources. (Press release, September 2011)


thumbnail Stream flow gains and losses in the Salt Basin, southeastern New Mexico –A USGS report, done in cooperation with the New Mexico Interstate Stream Commission, estimates mean-annual streamflow for selected channels in the Salt Basin, southeastern New Mexico. As much as 57 million acre-feet of groundwater may be stored in the subsurface of the New Mexico part of the Salt Basin in southern Otero County, New Mexico. Recharge to a system such as the Salt Basin aquifer can result largely from focused recharge of surface water in channels and at mountain fronts.

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