This traditional floodwater harvesting system is indigenous to south Bihar. The technique comprised of a channel (locally named as pyne) diverts water from rivers to a tank (ahar) from where it is distributed to the fields. Rivers in this region swell only during the monsoon, but the water is swiftly carried away or percolates down into the sand. All these factors make floodwater harvesting the best option here, to which this system is admirably suited.
The Apatani practice aquaculture alongwith rice farming on their plots. Rice - fish culture in the valley is a unique practice in the state where two crops of rice (Mipya and Emoh) and one crop of fish (Ngihi) are raised together.