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Scientists with the U.S. Geological Survey and the New Mexico Bureau of Geology and Mineral Resources are estimating changes in the amount of groundwater stored in the Mesilla Basin aquifer by precisely measuring differences in the acceleration of gravity at several locations. The change in aquifer storage is an important component of the water budget. The microgravity survey will be repeated throughout 2016. The microgravity survey is part of a larger, long-term hydrologic monitoring program. The Mesilla Basin monitoring program is a cooperative effort between the USGS, the City of Las Cruces Utilities the New Mexico Office of the State Engineer, Interstate Stream Commission, New Mexico Environment Department,...
The Big Chino sub-basin is a groundwater basin that includes the Verde River headwaters in Yavapai County in north-central Arizona. To monitor changes in groundwater storage and identify aquifer properties, a network of repeat microgravity stations and groundwater-level monitoring stations was established in 2010.
As part of the USGS effort to monitor the Albuquerque regional aquifer, a network of repeat microgravity stations was established in 2015. Data collection consists of absolute and relative gravity surveys three times per year.
The All-American Canal (AAC) in southern Imperial County, California, has historically been unlined, resulting in substantial losses to seepage. In 2006, the Imperial Irrigation District (IID), under a contract with the United States Bureau of Reclamation (Reclamation), initiated a project to build a concrete-lined canal parallel to 23 miles of the earthen AAC. Construction was completed in 2010, and was estimated to conserve about 67,000 acre-feet per year of seepage. Since 2009, groundwater levels and groundwater storage in the vicinity of the canal have decreased substantially. Repeat microgravity measurements provide estimates of storage change independent of aquifer porosity or depth to water. Measurements...


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