What is the primary function of geomembrane lining in canals?

To provide a barrier against water seepage, thereby conserving water and protecting adjacent land from waterlogging (Clause 1.1).

What is the most common method for joining geomembrane sheets on site?

Thermal welding (hot wedge or extrusion) is the most reliable and commonly used method for creating continuous, watertight seams (Clause 7.2).

How is the geomembrane secured at the top edge of the canal?

It is typically anchored by burying the end of the sheet in an 'anchor trench' dug along the crest of the canal (Clause 8).

What are some critical properties for geomembrane materials?

Tensile strength, tear resistance, puncture resistance, and resistance to ultraviolet (UV) degradation are key properties listed in Table 1.

IS 14207

: 1994

Guidelines for Canal Lining with Geomembranes

CurrentSpecializedGuidelinesBIMWater Resources · Irrigation and Canal Structures

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This standard provides guidelines for selecting and installing geomembrane liners in canals to control seepage. It covers material properties, site preparation, installation techniques, jointing, anchoring, and quality control measures.

Provides guidelines for the selection, design, and installation of geomembranes for canal lining.

Quick Reference Values

Minimum recommended geomembrane thickness0.75 mm

Minimum overlap for thermal welded seams75 mm

Minimum anchor trench depth300 mm

Minimum backfill cover in anchor trench300 mm

Typical air pressure for seam testing200 kPa

Maximum recommended side slope for lining3H : 1V

Practical Notes

Subgrade preparation is the most critical step; the surface must be smooth and free of sharp objects to prevent liner puncture.

Quality of seam welding is paramount for preventing leaks. 100% visual inspection and frequent non-destructive testing of seams are essential.

Consider provisions for venting gases that may accumulate beneath the liner to prevent uplift and 'whales'.