ABSTRACT
The irrigation and drainage arrangements for paddy terraces blocks have been applied by farmers using Subak's local wisdom for more than a thousand years. As long as they do not need the water through their fields, they seal the water distribution units using simple materials such as pieces of timber or clumps of soil. In this chapter, a careful approach on the role of irrigation-drainage in Subak irrigation systems has been conducted by observing the water levels at the inlet and outlet of a paddy terraces block during two dry and two wet seasons. The combined result can support the efficiency of irrigation water supply to paddy terraces of Subak irrigation schemes, in order to sustain agricultural productivity. It focuses on operation and maintenance of Subak irrigation schemes in conveyance of flow, especially in the role of irrigation-drainage based on the farmer's perspective.
