What are some design considerations for a landfill cover system drainage layer?
One of the primary causes of landfill cover system failure is an inadequate drainage layer resulting in seepage induced instability. When designing a drainage layer, factors such as slope angle, slope length, interface friction angles, climate, cover soil types, drainage layer material, and outlet drain requirements must all be considered together. It is recommended that Geosynthetics Research Institute Report # 19, “The Design of Drainage Systems Over Geosynthetically Lined Slopes” be used for all designs of granular or geosynthetic drainage systems placed over geosynthetically lined slopes.
