Question 33: Economic evaluation of irrigation projects - studies developed and case studies of economic and environmental effects. Question 34: Lateral subsurface drainage techniques and drainage construction methods. Question 35: Operation and maintenance of irrigation and drainage systems (Organization, maintenance equipment, operation, etc.).
Special Session - Special Session: Mass transfer of water over long distances for regional development and its effects on the human environment Symposium - Symposium: Development of techniques to recharge subterranean aquifers to conserve surplus river flows