Cyclone and Storm Surge - Iczmpwb.org

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Flows are diverted to the local surface drains like the Tolly's Nullah, Chetla Boat Canal, the
Panchannagram Canal and the Hooghly river.
3.11.3 Later Additions
The Dhapa Lock Pumping Station (DLPS) receives the sewage and drainage from the later
developments of North Eastern part of the city. There are four trunk sewers in the system. These are
(1) CIT Road, from Kankurgachi to Ultadanga (2) Ultadanga Main Road (3) CIT Road and Hem
Naskar Road (4) Beliaghata Main Road. The combined discharge of the first two trunk sewers is
conveyed to the DLPS via Ultadanga Drainage PS (UDPS). The remaining two meet at the CIT Road
junction and the combined flow runs under Beliaghat Main Road into the high level delivery sewer of
the UDPS to be finally led into the DLPS. There are a few Box Drains in the area that discharge into
the Kestopore Canal and the Beliaghata Canal. Tangra-Topsia System in the Central Eastern fringe
of the city caters to a low lying area which suffers from frequent waterlogging. Drainage of the area
mesuring about 5.17 sq. km. is effected through four pumping stations viz. (1) Topsia PS, (2)
Chingrighata PS, (3) Pagladanga PS, and (4) Kulia Tangra PS.
Very recently the Jadavpore and South Suburban Municipalities have been brought within the
jurisdiction of the Kolkata Municipal Corporation. For these latter areas the Tollyganj
Panchannagram, Monikhali, Churial, Keorapukur and Tolly's mullah etc. have to be properly
resectioned.
3.11.4. Formal distribution of administrative wards into drainage basins
The city of Kolkata may be divided into the following six major drainage areas:
1. Northern, or the Cossipore region
2. Central, or the town region
3. South-Central, or the suburban region
4. Southern, or the Tollygunge and Jadavpur regions
5. Eastern, or the Maniktola region
6. South-suburban area, or the Behala and Garden-Reach regions