Anchor Trench : Excavate
a continuous perimeter trench on a stable berm surrounding the pond/dam site by
means of trench digger or by means of an angled grader blade. The trench should
be far enough from the edge of the berm to provide adequate anchorage. Allow
for a minimum backfill of 500 mm over the buried liner.
Protrusions and Venting
Dam liner penetrations shall be subject
to designed requirements for operational purposes. Approved foundations,
pads and footings shall be provided to obtain a stable liner at
penetrated positions. Sealing of protruded structural or servicing
elements to the liner membrane shall be provided by an approved means
that will avoid concentrated liner stress points and provide a
permanently sealed point. Provision shall be made to allow the passage
to the surface of all gasses and springs without damage to the liner.
One Piece Panel/Sheet Installation
- Place the unpacked liner at position on berm level ground and unroll to its full length at pond perimeter.
- Place the lower liner loose edge into the perimeter anchor trench allowing ample material to be secured to the full width and depth.
- Hold the dam liner edge down by means of temporary sand bags intermittently along trench at its anchor position.
- Subject to the stability of the berm, the material should be carried across the lining area by two separate installation crews each carrying half the total weight of the liner. Rapidly extend the liner from its concertina fold to the opposite perimeter trench while allowing ample liner to relax into its final position.
- Avoid pulling or tugging at the liner after it has settled on the pond/dam bed as friction against the ground of a large liner area can be difficult to overcome. Careful planning beforehand will make the avoidable.
- When the liner been loose laid with evenly distributed surface ripple, place all surplus liner material into the perimeter anchor trench, allowing ample liner on the pond/dam bed to avoid stretching from ground settlement after filling.
Multiple Piece Installation – On-site Welding
For very large liners, joining on site
may be necessary. This is something that a professional must do as you
risk leaks in the seams. A professional installation team from Fabric
Solutions (or authorised installer), will be responsible for all on-site
material welding. When directed by the professional installer, position
the liners as explained above. Overlap panel edges approximately 200
mm.
Phone: 0738070200
Fax: +61 (07) 3807 8217
Email: info@fabricsolutions.com.au
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