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In 1978, the US Geological Survey found a 350-foot decline in the level of the water table. [6] The USGS published research in 1997, examining the Pennsylvanian and Permian age sandstone, limestone and siltstone underlying Flagstaff and the southern Colorado Plateau, which forms a complex regional aquifer with poorly understood groundwater flow ...
Arizona, Nevada and Mexico will continue to live with less water next year from the Colorado River after the U.S. government on Thursday announced water cuts that preserve the status quo. The ...
We expected Arizona to absorb even deeper water cuts in 2023. But we can't conserve enough by ourselves to stabilize the Colorado River.
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An 1870 map of Arizona shows an "Indian ... the water table in Green Valley has been declining in past years, and is expected to decline even faster as water demands ...
The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]
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The slope of the water table is known as the “hydraulic gradient”, which depends on the rate at which water is added to and removed from the aquifer and the permeability of the material. The water table does not always mimic the topography due to variations in the underlying geological structure (e.g., folded, faulted, fractured bedrock).