Chalakudy River or Chalakudy Puzha is the fifth longest river in
Kerala
Kerala ( ; ) is a state on the Malabar Coast of India. It was formed on 1 November 1956, following the passage of the States Reorganisation Act, by combining Malayalam-speaking regions of the erstwhile regions of Cochin, Malabar, South ...
, India. The river flows through
Thrissur district,
Palakkad district and
Ernakulam district
Ernakulam, ; ISO: ''Eṟaṇākuḷaṁ'', in Malayalam: എറണാകുളം), is one of the 14 districts in the Indian state of Kerala, that takes its name from the eponymous city division in Kochi. It is situated in the central part ...
of Kerala. The total drainage area of the river is 1704 km
2. Out of this,1404 km
2 lies in
Kerala
Kerala ( ; ) is a state on the Malabar Coast of India. It was formed on 1 November 1956, following the passage of the States Reorganisation Act, by combining Malayalam-speaking regions of the erstwhile regions of Cochin, Malabar, South ...
and the rest in
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 ...
. The length of the river is 145.5 km. Though Chalakudy River in strict geological sense is a tributary of the
Periyar river
Periyar, , (meaning: ''big river'') is the longest river and the river with the largest discharge potential in the Indian state of Kerala. It is one of the few perennial rivers in the region and provides drinking water for several major towns. ...
, for all practical purposes it is treated as a separate river by Government and other agencies. The river has gained its name since it flows along the banks of the
Chalakudy
Chalakudy is a municipal town situated on the banks of Chalakudy River in Thrissur district of the Kerala state in India. It is the headquarters of Chalakudy taluk. It is the base camp for travellers to Athirappilly Falls and Vazhachal Falls. ...
Town, the major settlement along the course of the river. It is perhaps the most unpolluted and pristine river in the state and even in India due to the limited amount of industries and wastage disposal around it. Chalakudy River and its basin area were one of the most affected rivers during the
2018 Kerala floods
On 16 August 2018, severe floods affected the south Indian state Kerala, due to unusually high rainfall during the monsoon season. It was the worst flood in Kerala in nearly a century. Over 483 people died, and 15 are missing. About a millio ...
.
Origin
Though the river has its origin in the
Anamalai
The Anamala or Anaimalai, also known as the Elephant Mountains, are a range of mountains in the southern Western Ghats of central Kerala ( Idukki district, Ernakulam district, Palakkad district, Thrissur district) and span the border of west ...
region of
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 ...
, it is actually a collection of some major tributaries originated from
Parambikulam
Parambikulam Tiger Reserve, which also includes the erstwhile Parambikulam Wildlife Sanctuary, is a protected area lying in Palakkad district and Thrissur district of Kerala state, South India. The Wildlife Sanctuary, which had an area of ...
, Kuriyarkutti, Sholayar, Karapara and Anakayam in
Kerala
Kerala ( ; ) is a state on the Malabar Coast of India. It was formed on 1 November 1956, following the passage of the States Reorganisation Act, by combining Malayalam-speaking regions of the erstwhile regions of Cochin, Malabar, South ...
.
Riparian vegetation
Chalakudy River is the one of very few rivers of
Kerala
Kerala ( ; ) is a state on the Malabar Coast of India. It was formed on 1 November 1956, following the passage of the States Reorganisation Act, by combining Malayalam-speaking regions of the erstwhile regions of Cochin, Malabar, South ...
with relics of
riparian
A riparian zone or riparian area is the interface between land and a river or stream. Riparian is also the proper nomenclature for one of the terrestrial biomes of the Earth. Plant habitats and communities along the river margins and banks a ...
vegetation in substantial level. The major threat has been submergence due to reservoirs. The annual report of the National Bureau of Fish Genetic Resources
Lucknow
Lucknow (, ) is the capital and the largest city of the Indian state of Uttar Pradesh and it is also the second largest urban agglomeration in Uttar Pradesh. Lucknow is the administrative headquarters of the eponymous district and division ...
, mentioned that the Chalakudy River is the richest river in fish diversity perhaps in
India
India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
. The riparian forests of the Chalakudy River have revealed the existence of a thick riparian vegetation of more than 10 metres width for a distance of 10.5 km downstream from Peringalkuth, covering an area of 58.5 hectares. Out of this, 26.4 hectares lie within the Vazachal area, including three large islands densely covered by riparian forests. The riparian forests of the area have been found to be characterised by the presence of typical riparian species of plants, in addition to evergreen and semi-evergreen species. Out of the 319 species of flowering plants identified from the study area, 24 are
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...
species of the
Western Ghats and 10 are rare and endangered.
Fauna
![Chalakudy River anticipating the monsoons](https://upload.wikimedia.org/wikipedia/commons/3/3e/Chalakudy_River_anticipating_the_monsoons.jpg)
The Chalakudy River is known for its diversity, as it contains 98 species of fresh water fish
[ out of the 152 species known from Kerala.][Ajithkumar, C.R., K.R. Devi, and K.R. Thomas (1999). ''Fish fauna, abundance and distribution in Chalakudy river system, Kerala.'' Journal of the Bombay Natural.] Among these, 35 are endemic species of the Western Ghats[ and 31 are either vulnerable (11 species), ]endangered
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and in ...
(16 species), or critically endangered (4 species) from indiscriminate collection for the aquarium fish trade, overfishing, pollution, dams and introduced species
An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived ther ...
.[Raghavan, R., G. Prasad, P. H. Anvar Ali, B. Pereira (2008). ''Fish fauna of Chalakudy River, part of Western Ghats biodiversity hotspot, Kerala, India: patterns of distribution, threats and conservation needs.'' Biodiversity and Conservation 17(13): 3119-3131] According to a report of the National Bureau of Fish Genetic Resources in Lucknow
Lucknow (, ) is the capital and the largest city of the Indian state of Uttar Pradesh and it is also the second largest urban agglomeration in Uttar Pradesh. Lucknow is the administrative headquarters of the eponymous district and division ...
, Chalakudy could well be the richest river in fish diversity in India, with thick vegetation on both sides.
Among the fish species in the river, the most species rich family are the Cyprinids
Cyprinidae is a family of freshwater fish commonly called the carp or minnow family. It includes the carps, the true minnows, and relatives like the barbs and barbels. Cyprinidae is the largest and most diverse fish family and the largest vert ...
, followed by Bagrid catfishes and hillstream loach
The hillstream loaches or river loaches are a family, the Balitoridae, of small fish from South, Southeast and East Asia. The family includes about 202 species. They are sometimes sold as "lizardfish" or (in Germany) "flossensaugers". Many of th ...
es.[ Among others, '' Horabagrus nigricollaris'' and '' Sahyadria chalakkudiensis'' are endemic to the Chalakudy River.
]
Waterfalls
The famous waterfalls, Athirappilly Falls
Athirappilly Falls, is situated in Athirappilly Panchayat in Chalakudy Taluk of Thrissur District in Kerala, India on the Chalakudy River, which originates from the upper reaches of the Western Ghats at the entrance to the Sholayar range ...
and Vazhachal Falls
Vazhachal Falls is situated in Athirappilly Panchayath of Thrissur district in Kerala on the southwest coast of India. Located on the west-flowing Chalakudy River near the Vazhachal Forest Division and at the edge of the Sholayar ranges, it ...
, are situated on this river. The hydro electric projects on Chalakkudy
Chalakudy is a municipal town situated on the banks of Chalakudy River in Thrissur district of the Kerala state in India. It is the headquarters of Chalakudy taluk. It is the base camp for travellers to Athirappilly Falls and Vazhachal Fal ...
River are Sholayar Hydro Electric Project and Peringalkuttu Hydro Electric Project. For irrigation purposes Thumboormoozhy Dam is constructed across this river. It merges with the Periyar River
Periyar, , (meaning: ''big river'') is the longest river and the river with the largest discharge potential in the Indian state of Kerala. It is one of the few perennial rivers in the region and provides drinking water for several major towns. ...
near Elenthikara, adjacent to Manjali, North Paravur
North Paravur. formerly known as Paravur or Parur, is a municipality and suburb in Ernakulam district in the Indian state of Kerala. It is a northern suburb of the city of Kochi and is situated around 20 km from the city centre. It is ...
in Ernakulam District
Ernakulam, ; ISO: ''Eṟaṇākuḷaṁ'', in Malayalam: എറണാകുളം), is one of the 14 districts in the Indian state of Kerala, that takes its name from the eponymous city division in Kochi. It is situated in the central part ...
and finally Joins Kodungallur Backwaters and Join Arabian sea at Azhekode. The Parambikulam Dam
Parambikulam Dam is an embankment dam on the Parambikulam River,
Parambikulam located in the Palakkad district in the Western Ghats of Kerala, India, ranks number one in India as well as in the top ten embankment dams in the world in volume in ...
has been built on the Parambikulam River, one of its four tributaries.
2018 Kerala floods
On 16 August 2018, severe floods affected the south Indian state Kerala, due to unusually high rainfall during the monsoon season. It was the worst flood in Kerala in nearly a century. Over 483 people died, and 15 are missing. About a millio ...
Though officially the flood was most severe on 16 August 2018, the banks of the Chalakudy River started flooding from the early hours of 15 August 2018 due to unusually high rainfall during the monsoon season. All the streams, low-lying areas and agricultural fields in the river's proximity was flooded already and the river was correcting the meandering curves created through its centuries of history. All the towns and villages within 5 km of the river were flooded except the slightly high hill tops. It was the worst flood in Chalakudy in nearly a century. The Indian government had declared it a Level 3 Calamity, or "calamity of a severe nature". It is the worst flood in Kerala after the great flood of 99 that took place in 1924.
Aftermath of the floods
The aftermath of the flood was very severe as it changed the overall outlook of the riverway from the mountains to the river mouth. Large areas of the river banks collapsed and caved in due to the powerful currents in the floods and new banks were created as a result. Huge trees along in the course were uprooted and deposited all along its flow especially on the bridges. Many road bridges even got displaced by a few cm due to the water's force like the Vettilapara Bridge. Also the fauna in the river was greatly affected as the indigenous fish species were displaced from their natural habitats. To make things worse, foreign species were introduced into the river system from the nearby fish farms that had hundreds of varieties of aquarium fishes like the Arapaima
The arapaima, pirarucu, or paiche is any large species of bonytongue in the genus ''Arapaima'' native to the Amazon and Essequibo basins of South America. ''Arapaima'' is the type genus of the subfamily Arapaiminae within the family Osteoglossi ...
, Arowana
Arowanas are freshwater bony fish of the subfamily Osteoglossinae, also known as bony tongues (the latter name is now often reserved for Arapaiminae). In this family of fish, the head is bony and the elongated body is covered by large, heavy sc ...
, Piranha
A piranha or piraña (, , or ; or , ) is one of a number of freshwater fish in the family Serrasalmidae, or the subfamily Serrasalminae within the tetra family, Characidae in order Characiformes. These fish inhabit South American rivers, fl ...
, Alligator Gar
The alligator gar (''Atractosteus spatula'') is a ray-finned euryhaline fish related to the bowfin in the infraclass Holostei . It is the largest species in the gar family, and among the largest freshwater fish in North America. The fossil ...
, Flowerhorn cichlid
Flowerhorn cichlids are ornamental aquarium fish noted for their vivid colors and the distinctively shaped heads for which they are named. Their head protuberance is formally called a nuchal hump. Like blood parrot cichlids, they are hybrids tha ...
, and Red-bellied Pacu. After the floods, an Arapaima of 65 kg, which was grown in a local farm as a tourist attraction, was caught from the Chalakudy river. It is the largest freshwater invasive fish found in Kerala.
Panorama
References
External links
*
Study of rivers in Kerala
Chalakudy River Protection Forum
Dam Has Kerala Greens Up In Arms, Sep 22, 2007, ''Tehelka Magazine''
{{Waters of Kerala
Rivers of Thrissur district
river
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of w ...