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Geotextile clay liners


felixthelogchopper
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I'm looking at options for relining at 50m x 28m pond and one of the ideas raised is a geosynthetic clay liner such as Bentomat or Bentotex. I've only had experience of natural clay liners (puddling) and Butyl so I was wondering if anybody on here had any experiences, good or bad, with this type of material. The main reasoning for considering it is that the pond is on the side of a steep slope and fed only by groundwater which means that it is subject to fluctuation in the level which would lead to a clay lining drying out and cracking, leading to leaks. As I understand it, a geosynthetic clay liner can dry out and rehydrate repeatedly with no ill effects, as well as being self-sealing in the event of being perforated. Thanks in advance for any information. :001_smile:

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we've done a lot of work with LA biodiversity units and amphibian/reptile groups where these have been put in during pond creation. Generally where there wasn't a natural inflow of water from a stream/ run off to keep it topped up, and or on new pond projects where there wasn't already a clay sub.

 

from my experience its just making sure that the overlaps are bonded well with clay.

 

There's always been a lot of marginal planting associated with the ponds I've helped complete so this may help with any drying out problems once established.

 

Due to the nature of the work its generally carried out during the winter months, which may also go someway to help this issue too - i.e. allowing the plants time to get going and shade the banks before water levels drop.

 

we've installed using the small rolls by hand and also been involved with bigger rolls put in using an excavator.

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Before we had the children I used to do a lot of canal restoration at weekends and it's the favoured method of lining where the canal has leakage problems. The level is pretty stable there, but it seems to be very durable. The Wendover arm of the Grand Union is the site I'm most familiar with it being used on. Some good pictures here:

 

Restoration2

 

but there are a lot more across the whole website.

 

Alec

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Used Bentomat a few times. Only had it go really wrong one just kept on drying out. Replaced it with a butyl one in the end.

 

The big thing is to make sure you get the overlaps right side to side and end to end. Oh memory brings to mind you had some sort of granuals to seal the ends too.

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