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Table 4.7
Yearwise variation of peak discharge in the Bhagirathi
Jangipur
Berhampore
Purbasthali
Discharge
(cumec)
Discharge
(cumec)
Discharge
(cumec)
Year W. L. (m)
W. L.(m)
W. L.(m)
1
2
3
4
5
6
7
1973
21.30
1,669
18.45
1,785
8.35
2,795
1974
21.18
1,558
NA
NA
NA
NA
1975
19.35
1,249
16.02
1,175
8.25
2,718
1976
20.02
1,362
16.45
1,348
7.92
2,433
1977
19.95
1,327
16.50
1,358
8.40
2,766
1978
19.56
1,337
19.55
2,257
8.30
2,734
1979
20.65
1,438
16.65
1,387
6.90
1,736
1980
20.14
1,381
17.85
1,696
8.65
3,044
1981
20.10
1,368
17.60
1,650
8.50
2,861
1982
19.96
1,317
17.40
1,576
7.15
2,280
1983
19.94
1,317
17.25
1,562
9.10
3,311
1984
19.91
1,315
17.30
1,563
9.68
4,057
1985
19.98
1,329
16.40
1,333
8.35
2,733
Table 4.8
Tidal range (m) in Hooghly estuary (1986)
Month
Samudragarh Garden reach Diamond harbour Haldia
Saugar
1
2
3
4
5
6
January
0.16
3.88
5.30
4.89
4.24
February
0.26
4.39
5.55
5.41
4.54
March
0.30
4.76
5.75
5.64
5.01
April
0.25
4.77
6.00
5.81
5.17
May
0.34
4.76
5.90
5.86
4.97
June
0.35
4.59
5.55
5.45
4.62
July
0.25
4.77
5.80
5.56
4.53
August
0.26
4.78
6.10
5.82
4.62
September
0.30
4.37
5.60
5.34
4.59
October
0.35
5.12
6.10
5.67
4.95
November
0.32
4.66
6.00
5.56
4.79
December
0.20
4.27
5.30
5.08
4.72
tide at the sea face and its variation at other places of the Hooghly in 1986 appear in
Table 4.8.
Considering the hydraulic features, the entire 2,645 km-course of the Ganga can
be divided into five major sections, which along with the river slopes in different
stretches, are given in Table 4.9
The longitudinal slope of the river-bed corresponding to the length of the Ganga
is shown in Fig. 4.2. The upward kink near Farakka, as shown in the figure is due to
bed-level difference between the Ganga and the Bhagirathi.
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