Posted by paul on November 20, 2012 at 07:23:29 from (66.60.223.232):
In Reply to: Re: dust bowl posted by 641Dave on November 20, 2012 at 06:52:23:
Certainly is a concern. Our best guess is we are pulling water out faster than it is going back in.
As it covers several states, and is fed from different rainfall areas, different water table lake and river areas, it's not an easy, simple thing to figure out exactly.
You can inventory a bank and coulnt exactly how many dollars are sitting in the vault, and look up how many dollars are invloved in loans, how many involved in deposits. And even banking there are a lot of questions on the health of any one bank....
A water aquafer is much more difficult to get exact counts on those numbers as there is so much varriation over millions of acres.
We are kinda guessing.
But, it is a real concern. Their projection of 20 more years before it runs out might be a bit inacurate, but still and all, there is reason to be concerned about it.
The theory of the auquafer is that glacial melt put a lot of water in the underground resivoir a long time ago, and that the natural re-supply it gets now from rainfall is much less.
Politics tends to overshadow science on things like this, we likely have a problem there that isn't quite as bad, nor quite as good, as different sides project.
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