"Today, Sabarmati has to be sustained by channeling Narmada water into it. But water from Narmada may not be available forever once work on Sardar Sarovar dam's canal network is over as Narmada may not have requisite water for Sabarmati," Ahmedabad Municipal Commissioner Guruprasad Mohapatra said.
"Currently, we have a secondary treatment plant at Pirana (on the outskirts of the city), where sewage water is being treated," Mohapatra said.
A 60 mld (million liter per day) tertiary sewage treatment plant will be set up in Pirana using the latest technology, he said.
"This tertiary sewage treatment plant will treat 60 mld sewage water from Pirana and that will flow within the interceptor drainage lines alongside the Sabarmati river front before releasing it in the river," Mohapatra added.     

"This is expected to divert 150 mld treated water daily to the river, which will replace Narmada water and ensure continuous flow in Sabarmati," he said.
Currently, the secondary sewage treatment plant at Pirana treats 860 mld (million liters per day) sewage water.      

Apart from keeping the non-perennial river (which doesn't have water throughout the year) Sabarmati brimming with treated water, it will aid aquatic life and farmers will get clean water to irrigate their fields. “Currently farmers irrigate their fields with highly toxic water,” Mohapatra said.


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