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<\/a>The areal and vertical location of the major aquifers is fundamental to the determination of groundwater availability for the Nation. An aquifer<\/strong> is a geologic formation, a group of formations, or a part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to wells and springs.<\/p>\n\n\n\n A two-dimensional map representation of the principal aquifers of the Nation is shown below. The map, which is derived from the\u00a0Ground Water Atlas of the United States<\/a>, indicates the areal extent of the uppermost principal aquifers on a national scale. In this map, a\u00a0principal aquifer<\/strong>\u00a0is defined as a regionally extensive aquifer or aquifer system that has the potential to be used as a source of potable water. (For study or mapping purposes, aquifers are often combined into aquifer systems.)<\/p>\n\n\n\n More information on the USGS web page here<\/a>. The book Water 4.0 <\/a>is a good read on this topic.<\/p>\n","protected":false},"excerpt":{"rendered":" I thought this was interesting. Water is going to be a very big problem at some point in our history as humans. If it’s not already. I had not seen a map like this before. The USGS put out a cool map with data on the USA aquifers. Click on the map for the PDF … <\/p>\n