Loch Ness Monster in the Garden Pond

Reader Question (summarized):
We installed a large pond last summer and after we received 10 inches of rain the pond liner in the bottom lifted up and it now looks like the Loch Ness Monster resides in the pond. Can you help?

Answer:
This is not an uncommon problem in garden ponds, especially if the pond was built in a low spot of the garden. It is also a very difficult problem to solve short of tearing the pond back out and moving it.
We encountered the same type of problem with one of our display ponds. The pond had mortared field stone around it and three waterfalls and we did NOT want to tear it back out.

We finally solved the problem by using a Danner pond pump (see link below) to drain the water from under the pond liner whenever it rained. We used a Pondmaster 1800 pond pump which has a threaded intake. We attached a threaded hose-tail fitting to the intake of the pump with about 20 feet of of 1" tubing and about 50 feet of 1" tubing to the outlet. We then carefully (without damaging the pond liner) made a small tunnel under the pond to the edge of the water bubble and threaded the intake hose under the pond liner.
Whenever it rained we just plugged in the pump and drained the bubble.
We eventually made this arrangement more permanent by threading PVC pipe under the pond to the bubble and digging a sump basin behind the pond that the PVC pipe drained into. We put the pond pump in the basin to empty it when it filled. Problem solved!

Featured link: Danner Pondmaster Pond Pump