Geoscience Reference
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62
63
7
6
60
61
59
5
58
4
57
55
54
56
42
46
3
Ref: numbers denote years
2
5
6
7
8
9
10
11
12
Spoils lifted in Million Tons
Fig. 6.6
Variation in quantum of dredging
The quantum and the cost of dredging in the channel as well as over the bars and
crossings went up steadily, necessitating increase in port levies and maintenance
costs but the port's losses were not made up. The quantum of dredging and total
dredging hours from 1942 to 1963 is shown in Fig. 6.6.
As upland discharge reduced, tides dominated the upper reach, raising salinity of
the river water. Supplies to Kolkata city and suburbs, to the industries on both banks
and for agriculture in the basin areas were severely affected. The potable limit of
salinity exceeded even up to Bansberia, about 50 km upstream of
Rabindra Setu
(the Howrah Bridge) in the lean season.
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