Cyclone and Storm Surge - Iczmpwb.org

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locks, one at Chitpur and another at Kulti has stopped since 1987. There is serious thinking on the
revival of this navigational system.
The southern parts of the metropolis are the added area under K.M.C. The drainage arteries are
Tolly's Nullah. Tollygynge-Panchannagram ( TP ) Khal which cater drainage of Jadavpur area. The
TP Khals in turn discharge into SWF channel through Chowbhaga Pumping Station, while the
drainage in the fringe areas of the metropolis under South Suburban Municipality in Behala and
Garden Reach areas is catered through Monikhali and Churial Khals through outfall sluices outfalling
into river Hooghly. The particulars of these drainage arteries are narrated in the following paragraphs.
Tolly's Nullah
This channel is basically a navigational channel having no regulatory arrangement either at intake or
at outfall. Tolly's Nullah is named after Major William Tolly who worked as an Engineer under East
India Company. He submitted a proposal to use the bed of the almost dead channel of Adiganga and
as a private venture excavated the channel under a temporary grant of land and to levy canal tolls
and completed in 1776. It was opened to navigation in 1777. The total stretch of 17 miles ( 27.5
Kms.) of the channel was named after him and is better known as "Tolly's Nullah" and it used to
outfall into river Bidyadhari near Sarnukpota or Tarda Port. The Govt took it over in 1804. The section
was increased for the passage of larger ships, barges and boats. It had been highly prone to silting
especially near and above Tollygunge where the tides of Bidyadhari and Tolly's Nullah used to meet
and had to be constantly cleared to keep it navigable. It drains a substantial area of the southern part
of the city including Keorapukur Basin, Regent Park, Bansdroni and other areas adjoining to cause
bank in the course of its 15.50 Km stretch from Garia Railway Bridge to Hastings on river Hooghly.
Boat Canal is an important tributary of Tolly's Nullah and it carries the sewage and storm flow of
C.P.T. area and is the biggest source of pollution of Tolly's Nullah.
Tollygunge-Panchannagram (TP) Khal
The Tollygunge-Panchannagram (TP) Khal, stretching a total length of 6.75 Km. along with its
intercepting channels of 5 Kms. and branch channels of 18 Kms. plays a formidable role to drain a
portion of added area of KMC viz. Jadavpur, Santoshpur, Kasba, Tiljala,etc. It happened to be one of
the lowest pockets, being almost a swampy area. Between the years 1934 and 1940, the area was
virtually waterlogged and an acute situation of distress, particularly in the Kasba and Haltu areas,
provided for a long time. Partial relief from the acute drainage congestion was however given in 1941
by Tollygunge Municipality by allowing the storm water from this area to be discharged into the reexcavated
Storm Water Flow (SWF ) channel at Chowbhaga through a sluice. The drainage situation