CONTENTS:- 1. Irrigation. 2. Importance of Irrigation System. 3. Water Requirement by Crops. 4. Irrigation with Wastewater. 5. Wastewater use in Aquaculture. 6. Agricultural Impacts on Water Quality. 7. Planning and Management of Water Resources. 8. Economics of Irrigation Service Supply. 9. Demand for Irrigation Services. 10. Role of agriculture in Eutrophication. 11. Agricultural Water Management and Climate Risk.