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thumbnail new Land Subsidence Along the Delta-Mendota Canal Poses Risk to Water Infrastructure in the Northern Part of the San Joaquin Valley, California –USGS, in partnership with the U.S. Bureau of Reclamation and the San Luis and Delta-Mendota Water Authority, reports that extensive groundwater pumping from San Joaquin Valley aquifers is increasing the rate of land subsidence. Findings show that the subsidence rate doubled in 2008 in some areas around the Delta-Mendota Canal. This subsidence is reducing the capacity of the Delta-Mendota Canal, the California Aqueduct, and other canals that transport floodwater and deliver water to agriculture, cities, industry, and wildlife refuges. The USGS report also includes data from satellite-based interferometric synthetic aperture radar (InSAR) images that characterize a large subsidence bowl first seen by California Department of Water Resources surveys northeast of the Delta-Mendota Canal in 2008 and 2010. The InSAR images processed by USGS indicate that this bowl is much larger than originally believed, encompassing roughly 1,200 square miles and including part of the canal. Centered near the town of El Nido, it is bounded roughly by the towns of Merced on the north, Mendota on the south, Los Banos on the west and Madera on the east. (Press Release; Report)

 

thumbnail A recently released Active Groundwater Level Network in Utah –contains water levels and well information from wells that have been measured by the USGS or USGS cooperators at least once within the past 365 days. The map interface allows users to select ground-water monitoring sites, view available site ground-water level data, and access summary statistics for site water-level data period of record.

 

thumbnail Water Level Decline in White Bear Lake, Minnesota –USGS, in cooperation with the White Bear Lake Conservation District and Minnesota Pollution Control Agency, relates historic lows in White Bear Lake to low precipitation and groundwater pumping for municipal use. (Read more also highlighted in the USGS Minnesota Newsletter)

 

thumbnail Projecting groundwater declines through 2037 in eastern Arkansas –USGS, in cooperation with the Arkansas Natural Resources Commission, released a report and developed a groundwater-flow model that evaluates changes in water-level altitudes from potential future pumping from the Sparta aquifer in the Bayou Meto-Grand Prairie area of eastern Arkansas for the 30-year period from 2007 through 2037. (View a short animation of water level decline from the USGS youtube page http://www.youtube.com/watch?v=v12i04psF2c).

 

thumbnail Record groundwater levels measured in the Spring in Louisville, Kentucky –In March 2012, USGS scientists measured the depth to water in 48 groundwater observation wells to ascertain the current elevation of the water table in the alluvial deposits beneath Louisville. New high water levels were recorded for 23 of the 48 wells. Water-level data have been collected in the alluvial aquifer at Louisville by the USGS since 1943. Interpretations of these data are published periodically to update the record and help manage this groundwater resource.

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