I agree with John. Geology ...

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I agree with John. Geology and recharge have been mapped with airborne geophysics. The SkyTEM system from Denmark mapped depth to and depth of an important aquifer in Nebraska. A cool interactive Google map showing the results can be found at http://www.lpsnrd.org/Programs/gwaem.htm. For a description of the technology KQED on the PBS network did a short video of the Nebraska project showing a 3D image of the mapped aquifer. Volumes of available water can be extracted from the data. The video is here http://video.pbs.org/video/2365289913/.