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| Last Updated:: 07/02/2018

Periyar

  

Basin area, km2

:

5398

Basin area in Kerala State, km2

:

5284

Basin area in neighbouring State, km2

:

114 (Tamil Nadu )

District of Kerala in which basin are located

:

Idukki, Eranakulam

Origin of River

:

Sivagiri Elevation. m : 1830

Length of main stream, km

:

244

Main tributaries

:

Muthirapuzha Ar, Perinjankutty, Idamalayar, Mangalapuzha

Average annual rainfall, mm

:

3200

Average annual streamflow, Mm3

:

4867.9

Important rainguage stations marked on the map (with code numbers)

:

1.     Kodungallur (1)

2.     Perumbavur(2)

3.     Irumpupalam (3)

4.     Odakkali (4)

5.     Adimali (5)

6.     Perinjankutty (6)

7.     Devikulam (8)

8.     Kokkayar (7)

9.     Malayattur(9)

10.   Kumily (10)

11.   Chinnar(11)

Important discharge stations marked on the map (with code numbers)

:

1.     Marthandavarma (1)

2.     Panniar (2)

3.     Kalady (3)

4.     Bhuthathankettu (4)

5.     Idamalayar (5)

6.     Rajakad (6)

7.     Kallar (7)

Water requirement for wetland for three crops, Mm3

:

1338

Water requirement for gardenland , Mm3

:

506

Water requirement for domestic use (2021 AD), Mm3

:

260

Water requirement for industrial use  (2021 AD), Mm

:

450

Existing major/medium irrigationproject (commissioned)

:

Periyar Valley

Major/medium irrigation projects under construction

:

Idamalayar

Existing Hydroelectric project

:

Sengulam, Neriamangalam, Panniar, Idukki

Hydroelectric project Under Construction

:

Perinjankuztty, Neo Pallivasal, Lower Periyar, Idamalayar, Puyamkutty, Erattayar, Kallar

Navigable length of river, km

:

72

 

(Note: The Periyar River is the longest river in the state of Kerala, India, with a length of 244 km. The Periyar is known as The lifeline of Kerala; it is one of the few perennial rivers in the region and provides drinking water for several major towns. The Idukki Dam on the Periyar generates a significant proportion of Kerala's electrical power. It flows north through Periyar National Park into Periyar Lake, a 55 km² artificial reservoir created in 1895 by the construction of a dam across the river. Water is diverted from the lake into the Vaigai River in Tamil Nadu via a tunnel through the Western Ghats. From the lake, the river flows northwest through the village of Neeleswaram into Vembanad Lake and out to the Arabian Sea coast. Its largest tributaries are the Muthirapuzha River, the Mullayar River, the Cheruthoni River, the Perinjankutti River and the Edamala River. Through the Periyar Lake dam and tunnel, the river serves as the major water source for five drought-prone districts in the state of Tamil Nadu, including Theni, Madurai and Ramanathapuram.)