Hal wrote:

On Sat, 22 Jan 2005 12:32:21 -0600, "Pam" wrote:

For the first few months after we built our pond it lost water every time
it rained. Sometimes it lost more than half its volume. It turned out
that the outlet from the kiddy pool veggie filter back into the pond was too
small. It could keep up with the pump (external ), but it couldn't keep
up with both pump and rain. If it rained long enough the veggie filter
would continue to overflow until the water level in the pond dropped low
enough to stop the pump. We put a much larger outlet in the veggie filter,
and will double the size of the veggie filter this summer.

I'm having a bit of trouble with adding more water causes one to lose
water. If the return pipe is adequate for pump flow that should
remain constant rain or shine.

I agree. You may have found the problem, but it was a problem before it
started raining. When the veggie filter pool gets full, it has more
pressure at the outlet and more water flows out into the pond unless
there is an obstruction. In other words, you had an obstruction out of
the veggie filter that caused less water to flow into the pond.

Otherwise the pond would have more water because it would have at least
the same amount flowing into it, plus it has the rain water coming into
it plus it has additional flow from the veggie filter pool due to the
increase height of the water in the veggie filter pool.

This all assumes that the pump flow was constant. It may have changed
for some reason.

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