Basin area, km²

:

497

Basin area in Kerala State, km²

:

497

District of Kerala in which basin are located

:

Thiruvananthapuram

Origin of River

:

Agasthya Hills Elevation.m : 1860

Length of main stream, km

:

56

Main tributaries

:

Kallar, Karavaliar

Average annual rainfall, mm

:

2300

Average annual streamflow, Mm³

:

207

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

:

1.     Neyyar Dam (1)

2.     Neyyattinkara (2)

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

:

1.     Ottasekharamangalam (1)

2.     Amaravila (2)

Water requirement for wetland for three crops, Mm³

:

412

Water requirement for gardenland , Mm³

:

90

Water requirement for domestic use (2021 AD), Mm³

:

94.1

Water requirement for industrial use  (2021 AD), Mm³ 

:

45

Existing major/medium irrigation projects(Commissioned)

:

Neyyar