North of Tambaram, inside of the MEPZ a 5.1 acres waterbody can be found, the Alleri tank.
It seems that this lake is having no severe problems. Lots of birds can be seen flying around, including kingfishers, pond herons and egrets. Even Indian flapshell turtles can be found inside the jungle of seaweed.
But under the water lies the reality. Tons of silt have built up all around the tank. This is mainly the result of unfiltered sewage entering the pond through an inlet located at the southeastern bund.
The general water quality has been affected and the water has turned toxic, a threat to everyone getting in contact with it. Only after the de-watering progress the whole dimension of the silt problem became visible.
Silt the result of an over-nutrition waterbody comes with a disadvantage, they are decreasing the water holding capacity massively. The water of heavy rains can’t be stored, overflowing is the result.
As the de-watering has come to an end, two pits of water have been installed in order to leave some space for the marine wildlife during the restoration progress.
De-silting work followed the process and is underway at the time of writing
E.F.I will install an artificial wetland at the Alleri Tank. With this method, the waterbody is able to clean dirty water itself before entering the main collection pit. Bunds will be formed in a way that the incoming water needs to flow some way before it gets to the recharge pit. Specific plants will be planted on the bunds to support the same.
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