On Jun 21, 10:49*pm, wrote:
On Sun, 21 Jun 2009 20:53:49 -0700 (PDT), harry k

wrote:
Another reason the surface water cannot 'flood the field' is that it
can't run into the tank to begin with. *If the tank is functioning
correctly, it is already full to the top.

It better not be, In fact it should not be much above the exit pipe in
the tank, that is lower than the input pipe,

Correct if you are referring to the _liquid_ level. The 'cake' floats
on top. Would water running onto the top of the cake penetrate it?
Dunno but the pumpers have to stir that up in order to suck it up.

Still leaves the problem of enough water making its way through small
cracks to 'flood the the field'. Then someone else already mentioned
the _fact_ that if ground water is entering the tank, the field is
already flooded.

Harry K