Water-supply Water resources development 36 Water rights 11 Water 10 Sustainable development 7 Water security 6 Watershed management 6 Water conservation 5 Water quality management 5 Agriculture 4 Droughts 4 Economic aspects 4 History 4 Civilization 3 Commonwealth countries 3 Commonwealth ministers 3 Drinking water 3 Foreign relations 3 Government policy 3 Hydrology 3 Industrialization 3 International relations 3 Irrigation 3 Medical care 3 Power resources 3 Telecommunication 3 Water utilities 3 Decentralization in government 2 Ecosystems 2 Education 2