Irrigation scheduling Drainage 1 Evaluation 1 Irrigation 1 Irrigation systems 1 Maintenance 1 Monitoring 1 Natural Resource Economics, (New March 2000) 1 Operation 1 Planning 1 Policy and Planning 1 Social environment 1 Soil Water Management (Irrigation and Drainage), (Revised June 2002) 1 Water Resources 1 Water management 1 Water policy 1 soil moisture 1 water conservation 1