Cyclone and Storm Surge - Iczmpwb.org

3.23
Table 3-8. Lifting / boosting pumping stations
Sl. No. Location Total Capacity Working under
1 Belgachia (R G Kar Hospital) 28 cusec Kolkata municipal authority
2 Ultadanga (New) 440 cusec Kolkata municipal authority
3 Maniktala (crossing of Raja
12 cusec Kolkata municipal authority
Dinendra Street and
Vivekananda Road)
4 Nimak mahal (Near circular 100 cusec Kolkata municipal authority
Garden Reach road)
5 Mominpur 6 cusec Kolkata municipal authority
6 Chetla lock 6 cusec Kolkata municipal authority
7 Jodhpur park 20 cusec Kolkata municipal authority
3.15.2. Open drainage system for conveying Kolkata’s storm and dry water flow to their
respective outfalls
The city itself has a network of underground drainage pipes, as mentioned above, but as the flow is
directed eastwards, these are discharged into open surface drains. Some of the drains are within the
city, but there are three major drains, rather canals, that drain the entire city discharge into the River
Kultigang, about 35 kms from the city. There are a couple of other drainage channels that flush out a
portion of the city’s water to River Hooghly. A brief description of each of these channels are given in
this section.
The Northern part of the city discharges about 300 cusecs (8.50 cumecs ) of water under normal
rainfall into Bagjola Khal through several pumping stations, for the southernmost areas like Behala,
Garden Reach, the drainage is effected in river Hooghly through Churial Khal, Manikhali Khal,
Tolly's Nullah etc. though the tidal effect in Hooghly river causes considerable period of blockage
during drainage time. Similarly, the city's main drainage outfall system, viz. SWF channel consisting
of SHC and THC, which outfall into river Kulti about 35 KM from Ballygunge Pumping Station is also
a tidal one, the drainage can be effected only for 51/2 hours in every 12 hour cycle on an average.
Moreover, the SWF system mainly catering city drainage in course of its long journey, also receives
drainage water from city contiguous part and also from rural and urban areas. The domain of
drainage under SWF system from the metropolis of Kolkata and the rural areas may be summarised
as in the following table.