The paper pinpoints some added considerations which must go into design and placement of membrane systems when aiming to prevent water ingress through side shear boundaries and tension cracks of a landslide. The earthslide at Watawala in Sri Lanka, taken as a case record, conveys that the success if the sealing by membranes depends not just on the rigours of membrane specifications or on the quality assurance in its placement but, more importantly, on the overall effectiveness of earthslide control measures. Lessons learned from the eathlside case are outlined and an approach to monitoring the efficacy of membranes for situations similar to one encountered.
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