In Indonesia, located in a tropical monsoon climate zone with dry and wet seasons, the main crop is paddy rice. If self-sufficiency in food, especially in rice, is to be achieved, increases in planted area and the unit yield must be the first okjectives.
Irrigation water supply is essential and indispensable. Ways of saving irrigation water and economical methods of irrigation are first introduced. Then ways of advancing irrigation projects and their technical stages are explained. Finally, five particular problems in irrigation project implementation are discussed and the measures to be taken are presented.

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