Case studies 1 Farmers' income 1 Human Health and the Environment 1 Human Wastes and Refuse 1 Income and Poverty 1 Irrigation 1 Public health 1 Sewage irrigation 1 Soil Water Management (Irrigation and Drainage), (Revised June 2002) 1 Wastewater 1 Wastewater treatment 1 Wastewater treatment plants Water Resources 1 Water resources 1 Water reuse 1