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Water level gauges. There is massive agricultural activity nearby and there have been numerous lawsuits and regulations regarding how much water the agriculture (in freakin Death Valley of all places) can pump out of the underground aquifer. So the National Park Service measures the water level so they know when the agriculture is pumping more water than they are supposed to be.
Don't get me starting with the fools in the desert Southwest pumping the water out of the ground faster than it can be replenished. Me, me, me, and screw the future generations.
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