The correct answer is Oorani.
Oorani is a traditional water harvesting practice in Tamil Nadu. It is a system of rainwater harvesting that involves building small dams or check dams across streams and rivers. The dams help to collect rainwater, which is then stored in tanks or reservoirs. The water can be used for irrigation, drinking, and other purposes.
Eri is a type of tank that is used for water storage. It is usually built on a flat piece of land and is surrounded by a bund or embankment. The tank is filled with rainwater, which is then used for irrigation, drinking, and other purposes.
Kudimaramath is a type of well that is used for water storage. It is usually dug in a dry area and is lined with bricks or stones. The well is filled with rainwater, which is then used for drinking and other purposes.
Surangam is a type of tunnel that is used for water storage. It is usually dug in a hilly area and is lined with bricks or stones. The tunnel is filled with rainwater, which is then used for irrigation and drinking.
Oorani is the most common type of water harvesting practice in Tamil Nadu. It is a simple and effective way to collect rainwater and store it for later use. Oorani is a sustainable practice that helps to conserve water and reduce the risk of drought.