Sandstone and preventing erosion

Köi-Lö wrote:

Mainly appearence. A rubber covered waterfall wouldn't have the same
(ahem...) charm ;^)

Oh. My neighbor covered the liner with flat limestone rocks. You can
barely see it.


I hope my liner will be fully hidden.

Basically I (will) have a stack of sandstone rocks with an EPDM liner
behind the stack to keep all the water contained and draining into the
lined pond. My concern is that the water pumped up to the top of the
rock stack will eventualy erode the rocks. It is my hope to build the
stack into what looks like an oozing spring, mainly just water flowing
down over the face of the rock stack. I do hope to have several ledges
built in that allow some water to pour over their lips and make small
falls that plunge into/onto flat sandstone rocks below. These lower
rocks will be slightly bowl shaped to form small pools so the plunging
water will not be directly in contact with the stone, but will be
splashing into the small pool formed by the stone. Either way there
will be water flowing over the sandstone and if the stone begins to
erode I thought about placing something at where the water flows over
the edge and where the water plunges into the stone bowl below to
reduce the erosion. I had though you were saying to place small sheets
of liner material where the water flows over the stones 8^)



It was my understanding if the water is alkaline the copper would not
dissolve and harm the fish or other aquatic life. Someone else I met at the
Pond club said that wasn't necessarily true. All you can do is give it a
go!

The local water is very hard (alkaline) so leeching issues are
minimized, but some alternative
methods would be to use "harder" rocks where the water makes the
plunges.

I see you read or heard the same thing. :-)


I can see a problem for copper that is submerged in the pond where it
is constantly exposed to the amonia and other products prouced in an
average fish pond, but in my application it would be acting more like a
gutter where it would get plenty of air exposure and get that brown
oxide covering. Of course if it begins to turn green and starts flaking
off I'll be in trouble....
-Bruce

Thanks for the input!
-Bruce
--
KL....
Frugal ponding since 1995.
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
~~~~ }((((* ~~~ }{{{{(ö ~~~~ }((((({*

"bruce" wrote in message
ups.com...

Either way there
will be water flowing over the sandstone and if the stone begins to
erode I thought about placing something at where the water flows over
the edge and where the water plunges into the stone bowl below to
reduce the erosion. I had though you were saying to place small sheets
of liner material where the water flows over the stones 8^)
================
I'm curious to know how it works. Report back on it if you remember.......
--
KL....
Frugal ponding since 1995.
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
~~~~ }((((* ~~~ }{{{{(ö ~~~~ }((((({*