Kolkata Environmental Improvement Project (KEIP) is a multi-agency endeavour to arrest environmental degradation and improve the quality of life in Kolkata. Its work is mainly in the outer areas of the city where the sewerage and drainage infrastructure is grossly inadequate and the drainage canals are choked by silt.
KEIP’s objectives are to reduce pollution
by providing affordable access to basic urban services in slums, revamp and up grade the sewerage and drainage system, make solid waste management system efficient,restore the city's drainage canals , and improve outdoor recreation facilities in parks and water bodies. It also has a capacity building component to raise the standards of KMC’s delivery of municipal services.
The Project will make
(i) sewage interception and collection efficient by providing secondary sewers;
(ii) build trunk sewers in addition to existing trunk lines;
(iii) develop separate stormwater drainage systems, including pumping stations, where necessary;
(iv) connect properties to the old and new networks;
(v) construct/rehabilitate pumping stations;
(vi) upgrade treatment plants and construct new ones where necessary.
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The details of KEIP’s sewerage and drainage work:
i) In Borough I, the network will cover trunk, branch, and lateral sewers as far as possible. Wherever lateral sewers cannot be connected, the existing surface drains will be connected to the nearest sewer network.
ii) In Borough VII, the drainage network will replace the existing open drains with underground sewers.
iii) In Borough XI, the drainage network will cover the branch and lateral sewers as far as possible because most of the trunk sewers already exist. Wherever lateral sewers cannot be connected, the existing surface drains will be connected to the nearest sewer network.
iv) Borough XII will follow the same principles of Borough XI with the addition of a few main (trunk) sewers. A new DWF (sanitary sewage) piping network has been considered so that sanitary waste can be directed to the existing DWF channel. This will ensure a clean TP canal system where only storm water will flow into the drainage network.
v) In Borough XIII, the drainage network will cover branch and some lateral sewers. Wherever lateral sewers cannot be connected, the existing surface drains will be connected to the nearest sewer network.
vi) In Borough XIV, the drainage network will cover mainly primary and some secondary sewers. Wherever sewers are not laid the existing drains will be connected to the nearest network. To overcome the problems associated with Open Cut Method & for fast progress Micro tunneling Technique has been adopted for Sewer Laying Work in Borough XIV at Biren Roy Road (West) & Diamond Harbour Road.
vii) In Borough XV, the drainage network will cover trunk, branch, and lateral sewers as far as possible. Most of the networks will be covered in rectangular section drains. Some underground stoneware and RCC pipes will also be used.
viii) The storm water drainage will terminate at three canal pumping stations—Chowbhaga (for the TP basin), Keorapukur (for Keorapukur-Tolly’s Nullah area) and Monikhali (for the Monikhali Basin).
ix) The DWF pumping system in Boroughs XI and XIII will pump the waste water to the South Suburban (East) Sewage Treatment Plant which is proposed to be augmented and renovated in this project. The treated effluent will be pumped into the Churial canal.
The DWF pumping system of Boroughs XIV and XV will pump the waste water to the Garden Reach STP which is proposed to be renovated by KEIP. The treated effluent will be discharged into the Monikhali canal.
The DWF pumping system of Borough I will pump the waste water to the Bangur STP which is also proposed to be reconditioned in this project. The treated effluent will be discharged into the Bangur Khal.
The DWF pumping system of Borough XII will discharge the waste water to the existing DWF channel.
