Migration of liquids lead to embarrassing post construction\nscenarios such as that of leaks from roofs, potable water leaking from\nwater tanks/ reservoirs, rising damp in walls with groundwater seeping into\nbasement structures, leakage of water from ornamental lakes and ponds or\nleachate leakage into the environment from MSW landfill sites. Such\nfailures demand immediate and expensive maintenance. A stringent control\non structural and waterproof stability is deemed necessary for long term\nservice life of structures and in particular underground and near surface\nstructures. On a micro scale and over a longer time scale, the phenomenon\nof rising dampness occurs in older buildings with the groundwater rising\nup through walls, floors and masonry via capillary action. Even slower\nrates of contaminant fluid migration occur through landfill base liners. In\nthis paper a variety of hydraulic barrier technologies is critically discussed\nagainst a backdrop of relevant case studies. The choice of an appropriate\nhydraulic barrier technology for a given scenario will depend also on the\nsustainability, financial affordability and subjective aesthetics.
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