Canal lining to reduce water loss in Egypt

Overview

Large-scale irrigation canals constructed to support agricultural expansion in Egypt faced the persistent problem of water loss through seepage. In regions dependent on controlled water distribution from the River Nile, unlined or inadequately lined canals reduce hydraulic efficiency and limit the ability to expand cultivated land. To address this issue, a long-term canal lining program was initiated in northern Egypt, including the North Coast and New Delta areas, and in southern Egypt in the Toshka region. The project began in 2021 and is planned over a ten-year timeframe. The purpose of the works is to conserve water resources, improve canal performance, and support sustainable growth in agricultural areas by implementing a reliable lining system for new canals.

Challenge

The core challenge was to prevent water losses across extensive canal networks constructed in varying geographic conditions while ensuring long-term performance. The lining system needed to function effectively beneath a concrete layer and over compacted soil subgrades, requiring stable interface behavior and resistance to movement during and after installation. The large surface area involved, measured in millions of square meters, added complexity to material supply and installation consistency over time. Achieving uniform quality across different construction zones and contractors was essential to ensure that the canals would perform as intended and deliver measurable water savings.

Solution

The adopted solution was the use of GSE^® HD geomembrane liners designed specifically for canal applications. The system included 1.0 mm double-sided textured GSE HD geomembrane, supplied in quantities of approximately 2 to 3 million square meters, and 1.5 mm single-sided textured HDPE geomembrane, supplied in quantities of approximately 1.5 to 2 million square meters. These geomembranes were installed over compacted soil and beneath the concrete lining layer. The textured surfaces provide anti-slip performance, improving stability between interfaces and reducing the risk of movement during construction. The GSE HD lining creates an impermeable barrier that significantly reduces seepage losses, enabling more efficient use of water resources and supporting the expansion of agricultural land. Contractors involved in the project reported consistent material quality throughout the works, with no complaints recorded, reinforcing the effectiveness of the solution in addressing the core problem of water conservation in large-scale canal systems.