Groundwater Flow – Part 2

Groundwater Flow – Part 2


These pictures showing the water table
in these diagrams. They are all kind of imaginary because we can’t just go around slicing the earth open and look at where the water table is. If we want to figure out which direction water flows. We need to do something
different. So what we do is we actually drill a hole through the through the
ground and then water will fill up. And it will fill back up
up until the height that we talked about before —
this magical height where its rising up so that everything is
balanced. If we drill a hole in a different place water will fill back up to a different
height because the water table is at a
different height in those areas. We can do that basically all the way
along here and essentially connect the dots so that we can construct one of these
pictures on the slices through the earth that shows which way the groundwater is
going to flow. The next thing to think about about the
water table is that of course when we have rain falling the
water table doesn’t stay where it is. We have a drop of water that percolates down and
adds more water in there. And you add another drop with more water
and slowly but surely we’re going to be getting more and more water such that the water table actually rises up and this is because of course all we’re
talking about is how much water is stored in all the
little pore spaces and as you add more water you’re gonna need to take up more space.
The opposite is true as well if you pump water out this is the exact
same scenario here we have the Big Bear River where the water table used to go right
across like this in a straight line before. But now, we suck water out from one spot. This is a groundwater extraction well. We’re actually pumping water out to drink or to use for irrigation and that causes the water table to go
down in this little cone of depression surrounding this ground water extraction well.

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