The key role for groundwater in urban water-supply security

Abstract Groundwater provides nearly 50% of urban water supply, and probably a higher proportion at times stress. systems generally exhibit exceptional resilience to drought are well positioned enhance security for wide range users, provided they adequately managed protected play the role sustainably. The serious water-supply crises recent years, such as those experienced by Cape Town, Săo Paulo, Chennai, have highlighted vulnerability major cities surface failure incorporate groundwater key element security. But some progress has been made worldwide in adaptive sustainable management this is illustrated cases Hamburg, Lima, Bangkok.