G.O.(Ms.) No.272, Creation of Additional Water Storage in Four Tanks, 2011
The Public Works (K1) Department issued G.O.(Ms.) No.272 on 20 December 2011, granting administrative sanction of Rs.130.00 crore to increase storage in Cholavaram, Porur, Nemam and Ayanambakkam tanks and restore additional storage in Chembarambakkam Tank. The works include proposed land acquisition covering 39.00.76 hectares for a surplus course from Nemam Tank to Chembarambakkam Tank.
What the government approved
The Public Works (K1) Department, through G.O.(Ms.) No.272 dated 20 December 2011, approved a Chennai drinking water storage augmentation programme. Administrative sanction of Rs.130.00 crore was granted for additional storage in Cholavaram, Porur, Nemam and Ayanambakkam tanks, together with restoration of additional storage space in Chembarambakkam Tank.
The programme is intended to create total additional storage of 568 Mcft in one filling. The combined capacity of the four tanks is proposed to rise from 1,474 Mcft to 2,042 Mcft.
Tank works and costs
G.O.(Ms.) No.272 provides for the following works:
- Cholavaram Tank capacity is proposed to increase from 881 Mcft to 1,081 Mcft, at an approximate cost of Rs.0.50 crore. Works include improvements to the weir body wall, apron and wearing coat.
- Porur Tank capacity is proposed to increase from 46 Mcft to 70 Mcft, at a cost of Rs.20.00 crore. Works include deepening, bund strengthening, repairs to the surplus weir, protective walls, inlet arrangements, sewage diversion and improvements to Thanthikal Channel.
- Ayanambakkam Tank capacity is proposed to increase from 290 Mcft to 314 Mcft, at a cost of Rs.30.00 crore. Works include bund strengthening, deepening, supply channel rehabilitation, weir reconstruction and a regulator.
- Nemam Tank capacity is proposed to increase from 257 Mcft to 577 Mcft, at a cost of Rs.79.50 crore. Works include desilting, bund standardisation, flood bank rehabilitation, a feeder canal and a surplus course to Chembarambakkam Tank.
Land and property impact
The Nemam Tank component includes provision for acquiring 39.00.76 hectares of land to form a 1,650 metre left side surplus course to Chembarambakkam Tank and protective walls. The document does not identify individual survey numbers, owners or acquisition boundaries.
Property owners near the proposed surplus course may therefore need to check later acquisition records or project plans to determine whether a particular parcel is affected. No land acquisition is expressly stated for the other tank components in the supplied text.
Implementation and oversight
G.O.(Ms.) No.272 directs the Engineer-in-Chief, Water Resources Department, to execute desilting through a silt sale option following due procedures. A third party must supervise work quantity and quality. The Water Resources Department and Chennai Metropolitan Water Supply and Sewerage Board must coordinate so that public water supply and construction work are not disturbed.
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Common questions
Does G.O.(Ms.) No.272 acquire my land near Nemam Tank?
The document provides for acquisition of 39.00.76 hectares for a surplus course and protective walls between Nemam Tank and Chembarambakkam Tank. It does not list survey numbers, owners or exact acquisition boundaries.
Which tanks are covered by the sanctioned works?
The sanctioned storage works cover Cholavaram, Porur, Nemam and Ayanambakkam tanks, along with restoration of additional storage space in Chembarambakkam Tank.
How much additional water storage is planned?
The four listed tanks are proposed to gain a combined 568 Mcft, increasing total storage from 1,474 Mcft to 2,042 Mcft.
Who is responsible for carrying out and supervising the works?
The Engineer-in-Chief, Water Resources Department, is directed to execute the desilting component and engage a third party to supervise work quantity and quality. Coordination with the Chennai Metropolitan Water Supply and Sewerage Board is also required.
