Planar drainage geocomposites have core configurations in the form of geonets, geomats, and geospacers, made of various polymers. Their hydraulic performance is dependent upon the applied loads, field boundary and environmental conditions. A 5mm thick geomat with regular wave like poly-propylene profile was evaluated in this paper to demonstrate its performance and suitability for engineer-ing applications. Results from conventional compressive creep and Stepped Isothermal Method (SIM) methods, and creep tests under combined normal and shear loads, show the long-term structural stability under low to medium loads. Long-term transmissivity results demonstrate a stable flow over time. Two case histories of successfully installed projects with this particular geomat illustrate the effectiveness in draining pore water in a high-profile dredging project, and in dissipating seepage water behind a Mechan-ically Stabilized Earth (MSE) wall structure.
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