Abstract
A Land Improvement District (LID) has been praised by the World Bank as one of the successful organizations of “Participatory Irrigation Manegement”. Here some typical layout of institution and structures of irrigation schemes is derived from a few large-scale LIDs. Our findings are: 1) The canals of different orders have the respective organizations for operation, maintenance and management of irrigation facilities from the primary canal down to the quarternaly canala. 2) The elementary organization is “mura”, one of whose functions is participatory irregation manegement. 3) “Mura” comprises many formal and / or informal organizations against social and administrative needs, such as a village association, a local group of farmers of Agricultural Cooperatives, as well as an informal local irrigation association, and so on.
