Bog/pond design

CaraRoseOctober 18, 2012

I'm in the process of building a pond with a bog shelf surrounding it. The pond and bog shelf will be separated by a permeable retaining wall. The pond has a liner, but I'm not putting one in for the bog. My thought was this will allow water to seep into the bog from the higher soil surrounding it, giving a drainage path for the other parts of the garden (this part of the yard has maybe 4" of top soil on top of several feet of dense clay).

I filled in the bottom of the bog shelf with clay soil, up to the top of the first rocks in the retaining wall, to bury the edges of the pond liner, above this I plan to add a mix of the clay soil, peat moss, and pea gravel, then top it all with an inch or two of pea gravel to hold the bog soil in place.

My main concern is whether the decision to not include a liner for the the bog was a bad idea. Is the weight of the water and dirt on top going to be enough to secure the pond liner? Or am I asking for trouble with water seeping under the liner?



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Nix the clay--straight peat moss and maybe a little sand will emulate nature best. Without the liner underneath you may find the bog dries out too often, so I'd include it if you still can. You can always poke holes in the bottom if it's retaining too much water (but you can't add the liner back in afterwards!). Also, why pea gravel on top? may add alkalinity to the bog, which is harmful to most bog plants that like a very acid soil. I just use pine needles as mulch.

Hope this helps...

    Bookmark   November 16, 2012 at 1:11AM
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This is the first time I heard pine needle in a bog area Thank You

    Bookmark   March 24, 2013 at 7:32PM
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I had missed your reply before I finished (was rushing to get most of it done by fall. Wish I would have seen it and rethought the liner. I found I was losing a lot more water than I thought I would back into the surrounding soil.

I had thought having the sides unlined would aid in water feeding out of the surrounding soil, which it probably will if we have a heavy rain, but it's going to happen in reverse when things are dry.

The gravel is there since I want run off water to feed through the gravel and bog like a filter before feeding into the pond. Sort of a psuedo bog filter like people often use for ponds.

Since the area is small and not planted yet. I might be able to still add some rearranging and either add liner along the edges or try to line the whole thing.

    Bookmark   March 29, 2013 at 11:59AM
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