I have similar soil, and I used just about as steep as sides on my lily
pond dug to 2 feet. This was built in 2000, so far all is A-okay, I also
used 45 mil EPDM. If the sandstone is smooth, the liner should be okay, but
I'll let someone more familiar with sandstone answer for sure. ~ jan

See my ponds thru the seasons and/or my filter design:
http://users.owt.com/jjspond/

~Keep 'em Defrosted~
Tri-Cities, WA Zone 7a
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On 28 Dec 2003 12:56:18 -0800, (Han Chung) wrote:

Hi,

I'm in the process of building a pond and am currently digging the
hole. A side view of what I have dug is below (I hope the formatting
is comes out OK):

| |
| |
|________ |
| |
| |
|________|

So basically, it's 2 metres/8 feet wide, 2 metres/8 feet long, half at
a depth of 0.8 metres/2.5 feet and the other half with a depth of 0.4
metres/1.2 feet. The pond's edges are dug at roughly an 80 degree
angle.

My questions:

1. Will the steep sides be a problem and cause too much pressure on
the pond liner? The sides are a sandy/soily material while the bottom
of both the shallow and deep ends are sandstone. I'm planning to get
the Firestone 45mil pond liner.

2. With the bottom of the pond being sandstone, will this cause any
problems? How thick a layer of sand would you recommend lining the
hole with before putting in the pond liner?

Thanks in advance,

Han.