Valankulam tank is situated in Coimbatore with a latitude of 100 58’ 48” and longitude of 760 55’ 44”. It is having a registered ayacut of 452 acres with the catchment area of 6.272 sq.km of free and 12.162 sq.km of combined area. The full tank level is 14.75 m.
The Noyyal river water is diverted to at the point of Coimbatore anaicut, then water is passing through the Coimbatore big tank, after overflow water reached to Valankulam. This tank is chain of water tank of river Noyyal.
Nearly 1600 huts are occupied in the foreshore and in the bunds of the tank. The water spread area of the tank is 0.648 sq.km. 14 acres of the area is allotted to the Tamil Nadu state transport corporation, 2.384 acre allotted to Tamil Nadu Housing Unit, 9.43 acres allotted to the Hindustral Petroleum Corporation Limited, 0.08 acres allotted for the private owners and 6.28 acres to be transferred to the Southern railways.
This water course is relatively polluted by domestic waste and sewage. The herbs commonly found here are Alternanthera pungens, Argemone mexicana, Cenchrus ciliaris, Chrozophora rottleri, Croton bonplandianus, Cyanodon dactylon, Cynodon dactylon and Cyperes rotundus. Eichornia crassipus, which is a floating aquatic herb, is occupying much of the area. Cardiospermum halicacabum can be seen on the bunds of the tank.
Shrubs such as Datura metel, Ricinus communis and Typha angustata are common here. The only tree species observed here is Acacia nilotica.
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