HDPE Dam Lining

On permeable soils, HDPE geomembrane is generally more effective than clay sealing or paint-on coatings. It tolerates settlement better than rigid systems, resists most agricultural water chemistry, and can be patched or extended when dams are enlarged. On mining and industrial sites, thicker 1.5 mm and 2 mm sheets are used where maintenance traffic or rocky subgrades increase puncture risk.

Compared to PVC, HDPE is stiffer and more resistant to UV and chemical attack, and is available in heavier thicknesses — usually the better choice when the dam surface area is measured in thousands of square metres and downtime from leaks is costly.

We start with site assessment: dam dimensions, batter slopes, inlet/outlet positions and soil conditions. The subgrade is cleared of rock, graded and compacted; geotextile underlay is used on stony ground. Liner panels are laid and field-welded, and seams are tested (air-pressure or vacuum, depending on the weld type) before anchor trenches are backfilled.

Pipe penetrations, overflow structures and crest anchoring are detailed to manufacturer standards. After flooding, we inspect high-stress zones and document as-built panel layout for your maintenance records.