Water resources development Water-supply 191 Management 132 Environmental aspects 47 Sustainable development 39 Government policy 30 Water quality management 27 Water 26 Economic aspects 24 Hydrology 23 Watershed management 22 Law and legislation 21 International cooperation 18 Hydraulic engineering 17 Water-supply engineering 17 Case studies 16 Groundwater 15 Congresses 12 Planning 12 Systems engineering 12 Water supply 11 Climatic changes 10 Flood control 10 Municipal water supply 10 Water rights 10 History 9 Developing countries 8 Political aspects 8 Water rights (International law) 8 Environmental policy 7