Earth Dam Linings / Geomembranes
Rainbow Tarps and Linings manufacture PVC dam linings to any size from recycled or virgin materials These UV stabilised Plastic liners with thicknesses of 400, 450, 500, 600, and 700 microns are a good alternative to HDPE liners and offer equivalent strengths to 1 mm and 2 mm thick HDPE Geomembranes.
Rainbow’s liners are ideal and effective for water proofing of any type of earth dam losing water.
Pre-Liner / Geotextile
Some dams may require a under liner in the form of a pre-liner or geotextile should the dams surface be a little rough and stony. A Pre-liner can act as a replacement for a thin layer of sand and therefore acts to protect the liner from any possible damage from beneath. We offer a recycled 320-micron PVC mesh or a recycled 400-micron reinforced PVC tarp as a cost effective method of doing this.
Pre-Liners are also required where a dam may require periodic cleaning and thus would have people walking on the liner.
Please note that the pre-liner CANNOT be used as a liner as it is a perforated material.
Liner / Geomembrane Options
400 micron - Offered in both virgin and recycled materials. Suitable for most large earth dams and domestic pond liner applications i.e. irrigation dams, duck ponds, koi ponds and dams purely for aesthetic value. This extremely popular liner is the most cost effective and value for money option on the market. A maximum DIY size of 2000 m2 is possible. Dams larger than this will require several pre-manufactured panels that will need to be installed on site by our installation team.
450 & 500 micron – – Offered as virgin materials. Suitable for leaking pre-concreted ponds and dams as well as large earth dams i.e. Irrigation dams, aqua culture, fish farming, golf courses etc. A maximum DIY size of approximately 1500 m2 is possible. Dams larger than this will require factory installation on site.
600 & 700 micron – Suitable for earth dams and old pre-concreted dams on game farms, mines and commercial fishing operations, water canals and larger dams where farm animals or game may enter. Maximum DIY installation of approximately 1250 m2 is possible. Dams larger than this will require factory installation on site.
A 320 micron PVC mesh (net) is a specialised reinforced PVC mesh that is welded into place on the dams walls to protect the liner from extended UV damage. This is especially useful on irrigation dams where the water levels are continually fluctuating, leaving the liner on the dam’s walls exposed to the suns UV rays daily or for an extended period of time.
This is a cost effective way to prolong even the thickest dam liners life span.
Extra Large Dams
Rainbow’s liners can be made up to fit any size dam. This is done by manufacturing large panels at our factory, these panels are then joined on site by using specialised machinery which welds the materials together to form a water tight seal / seam or by using our specialised “Dam Good Glue” if a DIY solution is desired to save costs.