Bottom Drains cemented in.

Here we deal with sand, sand mix with bigger sand (also called rocks.
And stuff out at the D.pond they call clay (ick).

Anyway, before I ever did a bottom drain, luckily another ponder had done
it in his soil which is the 2nd above. He didn't cement it. A year later he
decided to go deeper and found that the drain had settled several inches
and stretched the liner to almost nothing. Talk about lucky it didn't give
way.

So the demo.pond in the 3rd type of soil (clay) above we cemented in. My
lily pond, in the 1st type, sand, cemented in. Not worth the worry, and it
is such a little bit of cement it could easily be dug out. Though I'm the
type to build new not remodel. ;-)

All 3 of the above were 3" tetra drains. ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us