Geoscience Reference
In-Depth Information
Table 8.2
Percentage share between Ganga downstream and River Bhagirathi
Share of flow
Percentage share
River
Bhagirathi
(Mm
3
)
Total available
flow (Mm
3
)
Ganga downstream
(Mm
3
)
Ganga
downstream
River
Bhagirathi
Year
1
2
3
4
5
6
1975
426,250
407,500 (E)
18,750
95.6
4.4
1976
396,300
363,770 (E)
32,530
91.8
8.2
1977
433,930
401,610 (E)
32,320
92.6
7.4
1978
539,830
507,920 (E)
31,910
94.1
5.9
1979
256,620
223,610
33,010
87.1
12.9
1980
486,370
459,220
27,150
94.4
5.6
1981
390,250
358,250
32,000
91.8
8.2
1982
375,710
342,360
33,350
91.1
8.9
1983
373,280
340,870
32,410
91.3
8.7
1984
400,500
367,460
33,040
91.7
8.3
1985
448,470
415,800
32,670
92.7
7.3
1986
375,080
340,700
34,310
90.7
9.2
1987
398,140
367,200
30,940
92.2
7.8
1988
402,580
371,320
31,260
92.2
7.8
1989
343,750
309,190
34,560
89.9
10.1
1990
435,980
401,090
34,890
92.0
8.0
1991
370,110
336,930
33,180
91.0
9.0
1992
248,240
218,740
29,500
88.1
11.9
1993
340,660
312,470
28,190
91.7
8.3
1994
389,960
356,150
33,810
91.3
8.7
1995
363,550
330,180
33,370
90.8
9.2
Average
91.63
8.37
=
92.0
=
8.0
It may be seen from the table that though the total lean season flow (January to
June) in the river varied from a minimum of 28,670 Mm
3
in 1993 to the maximum
of 61,370 Mm
3
in 1984, the flow during the driest part of the lean season of March
to May is substantially reduced with the minimum of 10,590 Mm
3
in 1975 and the
maximum of 20,140 Mm
3
in 1979.
Distribution of Total Flow of the Ganga at Farakka
Though the total lean-season flow varied from a minimum of 28,670 mm
3
in 1984,
the flow in the driest lean season, March to May, hit the minimum of 10,590 Mm
3
in 1975 and the maximum of 20,140 Mm
3
in 1979. Thus, the average lean season
flow between 1975 and 1995 was about 39,103 Mm
3
. The share of total flow in the
lean season varied from 7% in 4 years - 1975, 1978, 1980 and 1985 - compared to
the total average flow of about 9.90% between 1975 and 1995.
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