water quality water management 224 groundwater 210 water pollution 184 water resources 148 water analysis 138 water supply 138 water use 133 standards 123 river basins 119 irrigation water 116 water demand 109 aquifers 104 water conservation 101 drinking water 94 case studies 87 environmental impact 84 water protection 83 water resource 83 water resources management 83 surface water 82 land use 81 wells 80 Ecosystem Management 77 salinity 77 water 77 environmental impact assessment 75 public health 75 irrigated farming 74 river basin development 74