I would go with plan a, the idea is for the liner to fill-in all spaces
itself, if you do plan b you are stretching the liner and can get rips.
Liners will last that long and longer. The other questions really can't be
answered because anything can happen

Dave M wrote in message
ink.net...
We built our pond using plan B and seems to have worked fine?

"Lynn Strickland" wrote in message
ink.net...
I've seen two approaches:

A. Put down underlayment, liner - then fill the pond to settle the
liner.
Drain the pond, then put in the rocks, gravel, etc.

B. Put down underlayment, liner, rocks and gravel - before filling the
pond
for the first time.

Is plan B okay?

One other question . . . the 45 mil Firestone liner is supposed to last
for
at least 20 years. How long have they been in use? Is it going to fall
apart at 20 years and one week, or will it likely last for 30 years?
Does
anyone really know [I will have the liner completely covered by rock
and/or
gravel]?

Are leaks inevitable, something I should plan on dealing with regularly,
or
can I expect years of leak-free use?

Thanks