& Geosynthetic Liners Innovative Solutions Installation Guide · Covering the Dam Liner Multiple...

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& Geosynthetic LinersInstallation Guide

Rev 4.03 page 1 of 3

Innovative Solutions


Site Preparation

Installing an Underlay

Excavate a continuous perimeter trench around the top of the dam wall. This can be done using a trench digger or back hoe etc. If using a V-trench use an angled grader blade. The trench should be far enough from the top edge of the dam wall to provide adequate anchorage. Allow for an approximately 300 to 500 mm over the buried liner.

To get the most from your DURADAM dam liner, make sure you prepare the site properly. Failure to do so could cause punctures, damage and pre-mature wear causing leakage leading to water loss.

Dam Liner

Backfill to secure liner

Typically300 to

600 mm wide

Typically300 mm to500 mm

deepTypically300 mm

wide

Anchor Trench

V Shape Anchor Trench

TOP OF DAM WALL

Geotextile Underlay

Waterproof your dam with a DURADAM liner for years to come!PLEASE NOTE, YOU MUST READ THIS COMPLETELY BEFORE INSTALLATION

It is important that the dam surface is dry, smooth as possible and that it is properly compacted. All sharp objects such as tree roots, stones, rocks or any other objects or protrusions likely to damage the liner must be removed prior to the dam liner being installed.

If you can walk on the dam liner surface and leave noticeable footprints or leave wheel tracks from vehicles, it may need further compaction.

Any dam liner needs to be properly secured around the perimeter. Most commonly this is done with an anchor trench. The anchor trench can either be a rectangular or a V trench. Please see the anchor trench section of this installation diagram.

If you want to cover your liner with soil cover, we recommend that the dam wall slope is no steeper than 1:3.

Most commonly the underlay will be supplied as a single piece to match the finished size of the dam. The underlay generally is only required up to the top of the dam wall and does not need to go into the anchor trench.

If the underlay has been supplied in multiple pieces, each piece will need to be overlapped approximately 300 mm.

A geotextile protection underlay or a layer of sand or graded fill maybe required if the dam surface can’t be suitably prepared.

450 mmto600 mm

450 mm min

NB. All measurements are an approximation only. You will need to take into consideration your particular dam design.

Anchor Trenchs

13



Installing the Dam Liner

1. Place the packaged liner in the position at your dam as indicated on the unfolding diagram supplied with the liner.

2. Completely unroll the liner and ensure it is centred correctly. See diagram A.

3. Pull out the liner as indicated on diagram A. You will require approximately 1 person every 6 to 8 metres. Heavier liners may require more people.

4. Don’t drag the liner across the ground. You will need to get some air under the liner to help it float above the ground. Have all assistants simultaniously raise and lower the edge of the liner to trap air underneath. Then pull the liner out in one continuous movement. See diagrams B, C & D.

5. Once the liner is in place, remove all air pockets from under the liner, see diagrams E and F. Ensure the liner sits in full contact with the entire dam surface. This can be achieved by adding some water or using sand bags. Once you are satisfied the liner is correctly placed, secure the liner in the anchor trench.




direction and positionof unfolding

anchor the liner in the trench lastin case an adjustment is needed

move as quickly as possible and don’t stop.Pull the liner right across in oneswift movement.

move as quickly as possible and don’t stop.Pull the liner right across in oneswift movement.

after putting the liner in place,make sure there are no air pockets

floor wall junction

the liner must be bedded allthe way around

PLEASE NOTE: Do not unpack the liner using sharp blades. Remove the packaging from the liner carefully to avoid damage.

1 person every 6 to 8 metres

(the heavier the liner th

e more

people you will need)

pullout second

2

unroll first1

your clean

& dry dam

anchortrench

Diagram A

Diagram B

Diagram E

Diagram F

Diagram C

Diagram D

Covering the Dam Liner

Multiple Piece Installation - Onsite Welding

Your DURADAM dam liner is made from quality UV stable material to give maximum life, so unlike some cheaper dam liners, back filling with soil or use of UV matting is not essential for the warranted service life.

However, if you wish you can still cover your liner to protect against animals or to extend the servicable life of the liner. There are two ways you can do this:

Method 1.Full coverage of the dam liner with sand or clean soil to a minimum depth of 300 mm.

Method 2. Partial coverage of the dam liner, to below the water line with sand or clean soil to a minimum depth of 300 mm.

Soil cover needs to be placed carefully or should be carried out by an experienced operator. Needless to say, machinery shouldn’t be driven over the liner, even when covered.

Protecting Your Dam Liner from AnimalsThis can be achieved in one of two ways:

1. A permanent and safer approach is to fully fence off the dam and to provide watering troughs outside of the fence.

2. Alternatively you can cover the liner with geotextile and 300 mm of gravel, in the area likely to be accessed by animals.

Please be mindful that damage to a dam liner is not covered under warranty.

Where the size of your dam requires multiple piece liners, Fabric Solutions Australia can supply both the liner pieces and an onsite fabricator.

Fabric Solutions Australia only provide fully trained and experienced installers/ fabricators that will weld the sections together and assist with the liner installation.

water level

Partial Covering a Liner to Maximise Lifespan

berm

300 mm soil

water level

Full Covering a Liner to Maximise Lifespan

berm

300 mm soil






Method 1. Completely covering the dam liner

Method 2. Partially covering the dam liner below the water line.

Disclaimer: Fabric Solutions Australia Pty Ltd has taken all care in the preparation of this guide but accepts no responsibility for any errors or omissions. This publication is intended as a guide only and not as a substitute for professional or tradesman’s advice. No person should act in reliance upon it without appropriate advice and knowledge of workplace health and safety requirements.

& Geosynthetic Liners Innovative Solutions Installation Guide · Covering the Dam Liner Multiple...

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