The tank-based irrigated agricultural system in the Dry Zone of Sri Lanka is one of the oldest historically evolved agricultural systems in the world. The main component of the system consists of a connected series of man-made tanks constructed in shallow valleys to store, convey and utilize water for paddy cultivation. Up to 10,000 tanks originating from the heydays of ancient kingdoms are still integrated in the current agricultural landscape. During the last two millennia, this indigenous system has undergone many changes in technological, management and socio-cultural norms.
Decline farm product prices and the subsequent effect of diminishing farm income become a core factor of sustaining peasant agriculture in developing countries. The small holding agriculture concentrated on paddy and vegetables farming in Sri Lanka also suffered from the issue causing many threats to sustain the industry. Nearly 30 percent of the labour force in Sri Lanka occupied in agriculture and thus deteriorating farm income has become core issue in national development.