AT WORK A DRAINTUBE TM case study Shale Fracking Impoundments Phase 1 – réhabilitée - 2009 During construction of natural water retention basins near Lock Haven, PA, the designer had to deal with 3 specific requirements: - Design an efficient drainage system under a geomembrane to allow for the maximum reduction of pressure related to the height of the water table and thus limit the formation of bubbles under the membrane during rapid drawdown fr

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