Dam and Pond Liners

  • Water filled tailing dam fitted with black liner at a mine site
Dams and ponds are a very economical and efficient storage solution for large quantities of water, waste water, effluent, leachates and tailings applications in mining, agriculture, farming and other sectors. Dam and pond liners play an important part in preventing the seepage that results in water loss or soil contamination. Fleximake manufactures high quality durable dam and pond liners for a wide range of applications. Fleximake liners are the ideal solution for sealing dams and ponds consisting of sandy soils, shale rock soils or loamed based soils that are prone to greater seepage or to fix a leaking dam or pond. Our liners are specifically manufactured and fabricated to provide optimal physical and chemical properties required for dam and pond liner applications. Fleximake liners are flexible, tear and puncture resistant allowing resilience against ground movements and cracks. Our liners have very low liquid transmission rates (i.e. outstanding waterproofing properties) which make it ideal not only for water storage, but also for other liquid containment applications such as dairy effluent ponds, landfill leachates and mining tailing dams. We also manufacture smaller liners suitable for domestic and commercial ornamental fish ponds.
Fleximake is one of the leading dam and pond liner manufacturers in Australia. We here at Fleximake have the fastest and most sophisticated plastic welding machines in Australia. The modern tech, high speed machines bring us the capability to guarantee you a fast delivery regardless of the size of any liner. This also means that we can offer you a very cost efficient solution as opposed to our direct competitors. Our manufacturing facility is capable of manufacturing large pieces of liners so that a one-piece liner is suitable for small and medium sized ponds and dams without site joining work. These large pieces of liners also help minimising site joining work for large dams. We are happy to provide you with our expert advice on installation of dam or pond liners. If you require we can also offer installation service for these liners.



  • Stormwater collection ponds and dams
  • Water storage dams for agriculture, aquaculture and aquaponics
  • Water storage dams for hot-houses, flower farms, wineries and golf courses
  • Water storage in coal seam gas application
  • Frac water ponds (i.e. Hydraulic fracturing)
  • Retention of landfill leachates, toxic waste management ponds
  • Reservoir liners, Irrigation canal and channel liners
  • Mining tailing dams, evaporation ponds and heap leach pads
  • Dairy effluent storage ponds
  • Waste water, Sewage and sludge treatment lagoons
  • Liners for containing pollutants for ground water protection
  • Biogas lagoon covers, floating pond and dam covers
  • For sealing of a leaking dam or pond
  • Key Benefits of Fleximake Dam and Pond Liners

  • UV resistant
  • Puncture resistant and durable
  • Can offer wide range of pipe fittings to suit your requirement
  • Chemicals resistant liner material
  • Can manufacture large pieces that eliminate or minimise joining work on site
  • Liner material to suit long term or short term application
  • Very economical solution
  • DIY installation or Fleximake installation services
  • Can supply the geo fabric underlay for your dam or pond
  • Large Ponds and Dams
    Small Ponds and Dams
    Liner Choices
    Reading Resources
    Large Ponds and Dams

    Large Ponds and Dams

    Calculation of Liner Size

    Accurate estimation of required dam liner size is important to avoid wasting money due to a liner that is too large or two small. Dimensions of liner size can be easily obtained for a new dam from excavation drawings. For an existing dam or pond, size of the liner can be estimated from measurements of the dam. You would also need to consider additional material for the overlay or overlap depending on the fixing method that you are planning.
    Fleximake can also offer geo fabric underlay for your project to provide more resilience and protection to the dam liner against ground movement. You can also estimate the amount of geo fabric underlay from excavation drawings or the measurement of your dam.

    Installation of Large Single-Piece (Single-Panel) Dam or Pond liner

    Fleximake can manufacture large single-piece dam or pond liners using our specialised machines. These single piece liners can eliminate tricky and time consuming liner joining work on site. We deliver our liners fully welded at the factory and folded in a way that you can easily unfold within the dam for convenient installation.

    Excavation and Ground Preparation of a new dam. If in an existing dam, divert the water inflow and pump the rest of the water out of the dam. Remove any organic matter and silt to reveal the original dam floor

    Ground needs to be prepared by eliminating any sharp objects that may damage the liner. Then, the dam floor needs to be smoothened and compacted to get rid of any rills and gullies

    Place a layer of geo fabric across the middle of the dam. Then place the liner in the middle of the dam on top of the geo fabric layer. Unfold the liner to from middle to the edges across the dam. Keep laying geo fabrics to cover the dam. The dam liner can then be unfolded on top of the geo fabric along the dam to the edges. The installation guidelines may vary case by case. Please consult Fleximake for installation guidelines for your liner.

    Adjust the liner on the side and the overlap of the dam while unfolding.

    Place the overlap on the recess around the edges.

    Make sure liner has slack and would not tension prior to filling the water. Allow for inflow to enter the lined dam via a stable inlet. If possible, fill the dam slowly (e.g. 30cm-40cm a day) to allow for proper wetting of the lining material, and gradually increasing the load on the embankment. Secure the liner by filling the recess to cover the overlap of the liner.

    Installation for Very Large Dam (Multi-Panel Liner)

    It is not usually practical to handle single piece liners for large ponds or dams above certain size. For these dams, multiple liner sections may need to be joined onsite by means of specialised plastic welding methods to ensure water proofing. Fleximake can provide you with onsite welding services to ensure high quality and fast delivery of your project.
    Small Ponds and Dams

    Small Ponds and Dams

    How to Calculate Liner Size for a Small Pond

    Required liner size for small ponds can be calculated easily with the following equations

    Length of pond liner = Pond length + (2 x Pond depth) + (2 x Edge length)
    Width of pond liner = Pond width +(2 x Pond depth) + (2 x Edge length)

    Required edge length depends on individual application and method of securing the liner, however minimum recommended edge length is approx. 400mm

    For example, the liner size for a pond measured with length of 4m, width of 3m and depth of 1m can be calculated as follows. Required edge length of 400mm (i.e. 0.4m) is used for the calculation

    Length of pond liner = Length of Pond liner = 4 + ( 2 x 1) + ( 2 x 0.4 ) = 6.8m
    Width of pond liner = Width of pond liner = 3 + ( 2 x 1) + ( 2 x 0.4 ) = 5.8m

    How to Install Small Pond Liner

    1. The ground and sides of the pond need to be prepared by removing any weeds, stones, rocks or tree roots. Ensure they are smooth and free of sharp items that may damage the liner. We recommend applying a sand layer or a geo fabric layer on the ground prior to install the liner. This will provide more resilience to any ground movement and also to provide additional protection for the liner.
    2. If the liner is to be used for a fish pond, then rinse the liner with water and mild detergent to remove any oils or grease deposited which may be harmful to the fish.
    3. Place the pond liner in the pond, then unfold and shape to fit the pond. Observe the edges all around to make sure sufficient edge length. If not sufficient edge length, then adjust until satisfactory.

    Moving the liner to pond

    Unfolding the liner

    Adjusting the liner

    4. Secure overlapped edges around the pond using temporary weights (i.e. bricks or rocks) and adjust the liner to remove as many creases as possible for better aesthetics prior to start filling. Adjust the liner while filling if required.

    Securing the edges of the liner

    Adding a sand layer on the liner (optional)

    Pond filled with water (initial fill of dirty water is shown)

    Liner Choices

    Dam and Pond Liner Material

    We manufacture dam and pond liners from strong, durable, heavy duty fabric materials suitable for harsh environments in commercial, mining and industrial applications. We have a range of different materials available to select from that are best suited to your application. We can help you select the most economical material suitable for your needs considering water or liquid characteristics. Following are some of the materials available.

    Enviro Liner® 6000x

    Enviro Liner® 6000x is a specialized fortified polyolefin alloy that is designed for extended life in most geomembrane applications. Fortified geomembranes are manufactured with special prime grade resins that are stabilized with advanced UV stabilizers and antioxidant additives. This provides the geomembrane with superior physical, mechanical, and endurance properties.

    Enviro Liner® 6000x is fortified with the latest in Ultra Violet/Anti Oxidant (UV/AO) stabilization packages that provides exceptional UV resistance. It is designed for long term exposed applications and very good chemical resistance. It is available in thicknesses of 20, 30, 40, 50, 60 and 80 mils (0.5, 0.75, 1.0, 1.25, 1.5, 2.0 mm). Every step in the production of an Enviro Liner® 6000x geomembrane is completed to ISO 9000 quality management system. The Enviro Liner® 6000x series has been tested for various key performance properties and the results of these tests are listed below

    Enviro Liner Specifications

    Aquacon™ 345

    Aquacon™ 345 is a premium polyethylene scrim reinforced coated fabric, specifically designed for floating cover and liner applications. Lightweight, flexible and durable Aquacon™ 345 exhibits class leading welding characteristics, providing effective and efficient field welding performance, ideal for in-factory fabrication and deployment on-site. The high strength woven HDPE scrim reinforcement and engineered UV-stabilised polyethylene coatings provide outstanding puncture and abrasion resistance to withstand the harshest of installation and environmental conditions. It is available in thickness of 0.45mm (fabric mass: 365gsm)

    Aquacon Specifications


    Aquamark® is a lightweight, flexible and extremely tough fabric. It features excellent welding characteristics and high tear strength. Aquamark® 400 is coated in an Australian facility using proprietary coating process. Its high quality Polypropylene based polyfabric specifically designed for lining ponds and dams. Aquamark® consists of the PP base scrim with a highly flexible, UV stabilised PP coating. It is available in thickness of 0.55mm (fabric mass: 400gsm) and 0.65mm (Fabric mass: 480gsm)

    Aquamark Specifications

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