Geoscience Reference
In-Depth Information
Table 14.2
Average monthly discharge of the Ganga at Farakka (1979-1988)
Discharge in
cusecs
Discharge
in cumecs
Month
Remarks
January
February
March
April
May
June
July
August
September
October
November
December
57,430
46,020
37,620
37,330
48,460
125,000
734,500
1,386,000
1,382,000
569,800
188,700
97,330
1,630
1,300
1,070
1,060
1,370
3,560
20,800
39,250
39,150
16,130
5,340
2,760
1) Low discharge below 1132 cumecs (40,000
cusecs) recorded in 1981, 1983, 1984, 1985,
1986, 1987 and 1997.
2) High flood occurred in August during 1979,
1981, 1984, 1985, 1986, 1988, 1996 and 1998.
3) High flood occurred in September during
1980, 1982, 1983, 1987, 1996 and 1998.
4) In none of these years high flood crossed
56,625 cumecs (2,000,000 cusecs) for one
month.
Average
392,650 Say,
393,000
11,118 Say,
11,120
Table 14.3
Average monthly discharge of Bangladesh rivers (in 1000 cumecs)
Ganges at Hardinge bridge
(1934-1963)
Brahmaputra at
Bahadurabad (1956-1962)
Meghna at Bhairab Bazaar
(1957-1962)
Month
Max
Min
Mean Max
Min
Mean Max
Min
Mean
January
5.10
2.29
3.11
6.60
4.36
5.21
0.65
0.51
0.59
February
4.76
1.90
2.75
4.98
3.40
4.33
0.54
0.37
0.48
March
3.60
1.61
2.35
5.97
3.77
4.67
1.10
0.51
0.62
April
2.97
1.25
2.04
8.61
5.15
7.13
1.13
0.74
0.91
May
3.14
1.39
2.12
24.04
7.98
17.81
2.49
1.39
1.93
June
9.68
2.35
4.36
38.65
26.50
32.22
5.38
3.37
4.19
July
29.59
10.76
18.09
45.36
33.55
40.15
9.12
5.69
7.28
August
52.58
23.61
39.44
55.52
30.72
44.00
9.14
6.68
7.76
September
56.03
25.03
36.64
48.50
24.35
35.33
9.51
6.43
7.73
October
42.30
8.35
17.72
32.28
14.07
21.49
8.10
5.27
6.68
November
16.53
4.39
7.19
14.98
8.49
10.59
5.01
1.78
2.77
December
6.74
2.86
4.19
9.37
5.66
6.65
1.27
0.79
0.99
Mean
(Annual)
16.36
7.81
11.66
21.74
17.98
19.20
3.94
3.00
3.51
the total contribution by the Mahananda and these tributaries is about 15,000 million
cusecs; about 50% of it comes from India. No control structure exists across these
rivers. The total catchment areas of the Mahananda (over India and Bangladesh) and
its tributaries are about 10,000 sq. km and 20,000 sq. km, respectively.
The catchment area of the Bhagirathi-Hooghly sprawls over about 60,000 sq. km
but unlike the Ganga's tributaries in the upper and lower reaches, which started from
the Himalayas, its tributaries have their origins in Rajmahal and Chhoto-Nagpur
hills which are much lower than the Himalayas and therefore, have very little, or no
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