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by jubjubbird
2524 days ago
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In the U.S. it varies widely by state. The USGS has a map of "recent" groundwater levels: https://groundwaterwatch.usgs.gov/default.asp With some obvious large gaps. There are more collected by state agencies, consultants, etc. In most places there are probably more wells than you'd think. In addition to measuring gravity from space to monitor groundwater it can be measured at the land surface, with better spatial resolution and worse accuracy. A 1x10-8 m/s^2 change in gravity is 2.4 cm of groundwater! https://pubs.usgs.gov/fs/2018/3032/fs20183032.pdf |
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