Kallanai (also known as the Grand Anicut) is an ancient dam. It is built (in running water) across the

Kaveri The Kaveri (also known as Cauvery, the anglicized name) is one of the major Indian rivers flowing through the states of Karnataka and Tamil Nadu. The Kaveri river rises at Talakaveri in the Brahmagiri range in the Western Ghats, Kodagu d ...

river flowing from Tiruchirapalli District to Thanjavur district,

Tamil Nadu Tamil Nadu (; , TN) is a state in southern India. It is the tenth largest Indian state by area and the sixth largest by population. Its capital and largest city is Chennai. Tamil Nadu is the home of the Tamil people, whose Tamil language ...

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area, the List of countries and dependencies by population, second-most populous ...

. The dam located in Thanjavur district. Located at a distance of 15 km from Tiruchirapalli, 45 km from

Tanjavur Thanjavur (), also Tanjore, Pletcher 2010, p. 195 is a city in the Indian state of Tamil Nadu. Thanjavur is the 11th biggest city in Tamil Nadu. Thanjavur is an important center of South Indian religion, art, and architecture. Most of the ...

, the dam was originally constructed during the reign of

Chola The Chola dynasty was a Tamil thalassocratic empire of southern India and one of the longest-ruling dynasties in the history of the world. The earliest datable references to the Chola are from inscriptions dated to the 3rd century BCE d ...

king

Karikalan Karikala ( ta, கரிகால சோழன்) was a Tamil Chola Emperor who ruled southern India. He is credited with the construction of the flood banks of the river Kaveri. He is recognised as the greatest of the Early Cholas. Source ...

in c.150 CE. It is the fourth oldest water diversion or water-regulator structures in the world and the oldest in India that is still in use. Because of its spectacular architecture, it is one of the prime tourist spots in Tamil Nadu.

History

The dam was originally built by King

of the Chola Dynasty in . It is located on the river in Thanjavur district, exactly 14 km from the city of

Tiruchirappalli Tiruchirappalli () ( formerly Trichinopoly in English), also called Tiruchi or Trichy, is a major tier II city in the Indian state of Tamil Nadu and the administrative headquarters of Tiruchirappalli district. The city is credited with be ...

and 45 km from the city of Thanjavur. The idea behind the construction of the dam was to divert the river to the delta districts thereby boosting irrigation. This dam was re-modeled by the British during the 19th century. In 1804, Captain Caldwell, a military engineer, was appointed by the British to make a study on the Kaveri river and promote irrigation for the delta region. He found that a large amount of water passed onto the Kollidam leaving behind a small volume for irrigation purposes. Caldwell initially proposed a solution by raising the dam and hence raised the dam stones to a height of , thus increasing the capacity of the dam. Following this, Major Sim proposed the idea of undersluices across the river with outlets leading to the Kollidam River (Coleroon) thus preventing formation of silt. The Lower Anaicut built by Sir Arthur Cotton in the 19th century across Coleroon, the major tributary of Cauvery is said to be a replicated structure of Kallanai.

Geography

The

river splits into two at a point west of Kallanai. The two rivers form the island of Srirangam before joining at Kallanai. The northern channel is called the Kollidam (Coleroon); the other retains the name Kaveri, and empties into the

Bay of Bengal The Bay of Bengal is the northeastern part of the Indian Ocean, bounded on the west and northwest by India, on the north by Bangladesh, and on the east by Myanmar and the Andaman and Nicobar Islands of India. Its southern limit is a line bet ...

at Poompuhar. On the seaward face of its delta are the seaports of

Nagapattinam Nagapattinam (''nākappaṭṭinam'', previously spelt Nagapatnam or Negapatam) is a town in the Indian state of Tamil Nadu and the administrative headquarters of Nagapattinam District. The town came to prominence during the period of Medieval ...

and

Karaikal Karaikal ( /kʌdɛkʌl/, french: Karikal /kaʁikal/) is a town of the Indian Union Territory of Puducherry. Karaikal was sold to the French by the Rajah of Thanjavur and became a French Colony in 1739. The French held control, with occa ...

Description

The purpose of the Kallanai was to divert the waters of the Kaveri across the fertile delta region for irrigation via canals and to its northern delta branch Kollidam/Coleroon. Downstream of the barrage, the river Kaveri splits into four streams known as Kollidam Aru, Kaveri, Vennaru and Puthu Aru. However, the flood waters can be allowed, by opening the barrage/anaicut gates, to pass through the other three delta branches also to join the sea. It is constructed from unhewn stone spanning the Kaveri and is long, wide and high. The dam is still in excellent condition, and supplied a model to later engineers, including Sir

Arthur Cotton General Sir Arthur Thomas Cotton (15 May 1803 – 24 July 1899) was a British general and irrigation engineer. Cotton devoted his life to the construction of irrigation and navigation canals throughout British India. He helped many people by b ...

's 19th-century dam across the Kollidam, the major distributary of the Kaveri. The area irrigated by the ancient irrigation network is about . By the early 20th century, the irrigated area had been increased to about one million acres (400,000 ha). The delta farmers of Tamil Nadu have demanded the Tamil Nadu government to honor Karikala Cholan, who built this dam.

Gallery

File:Kallanai Name Inscription.jpg File:Kallanai.jpg, Engineering wonder of Karikalan's period File:Fishing Kallanai.jpg, Fishing in the sluices, Kallanai dam, Tiruchirappalli File:Kallanai 2.jpg, Another view, Kallanai dam File:Kallanai 3.jpg, Kallanai dam File:Water flowing out of grand anaicut.webm, Water being discharged from Kallanai in August 2018 witnessing beauty of kallanai in river Kauvery

References

Bibliography

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