Pond level DROPS after heavy rain?

yup!! you hit the nail on the head. Ingrid

Mike Patterson wrote:
The only thing I can imagine to explain this is some sort of siphoning
action that only gets started when the pond is heavily flooded but
that breaks when the level gets low enough.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
List Manager: Puregold Goldfish List
http://puregold.aquaria.net/
www.drsolo.com
Solve the problem, dont waste energy finding who's to blame
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Unfortunately, I receive no money, gifts, discounts or other
compensation for all the damn work I do, nor for any of the
endorsements or recommendations I make.

Mike Patterson wrote in message . ..
I have a 1200 US Gallon pond with an overflow spillway at one end.

If I fill it up, it seems to hold it's level fine, but after a really
heavy rain (we got about 3 inches in 4 hours a couple days ago), the
water level after the rain was about 3-4 inches LOW.

Over fill and watch around the edges. I'll wager that part of the
sides is not properly supported and the extra water causes the
membrane to flop down. Once the water level drops enough, the membrane
stiffness makes it come back up where it belongs, and you have less
water than before.

Creative! Mike, is that Offbreed right?

Jim

"Offbreed" wrote in message
...
Mike Patterson wrote in
message . ..
I have a 1200 US Gallon pond with an overflow spillway at one end.

If I fill it up, it seems to hold it's level fine, but after a really
heavy rain (we got about 3 inches in 4 hours a couple days ago), the
water level after the rain was about 3-4 inches LOW.

Over fill and watch around the edges. I'll wager that part of the
sides is not properly supported and the extra water causes the
membrane to flop down. Once the water level drops enough, the membrane
stiffness makes it come back up where it belongs, and you have less
water than before.