Basin area, km²

:

642

Basin area in Kerala State, km²

:

642

District of Kerala in which basin are located

:

Kollam , Thiruvananthapuram

Origin of River

:

Madathurikunnu Elevation.m : 240

Length of main stream, km

:

56

Main tributaries

:

Vattaparambu,Kundumanthodu, Vattamthodu, Kulanjethodu

Average annual rainfall, mm

:

2400

Average annual streamflow, Mm³

:

489

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

:

1.     Ayoor (1)

2.     Ithikkara (2)

Water requirement for wetland for three crops, Mm³

:

343

Water requirement for gardenland , Mm³

:

150

Water requirement for domestic use (2021 AD), Mm³

:

103.5

Water requirement for industrial use  (2021 AD), Mm³ 

:

45

Navigable length of river, km

:

16