Dam Liners – Protrusions and Venting

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

More Detail Visit :- Dam Liners