Geoscience Reference
In-Depth Information
Table 4.4
Average annual flow in the Ganga and its tributaries (K. L. Rao, 1975)
Location along
the Ganga
Run-off in tributary
(million m
3
)
Run-off in Ganga
(million m
3
)
Sl. No.
Name of tributary
1
2
3
4
5
1
Hardwar
-
-
21,400
2
Allahabad
Yamuna
a) Chambal
b) Ramganga
93,000
(30,000)
(15,300)
59,000
3
Allahabad after
confluence with
Yamuna
-
-
152,000
4
Patna
-
c) Tons
d) Sone and
others
e) Gomti
f) Ghagra
g) Gandak
-
(5,900)
(31,800)
(7,400)
(94,400)
(52,200)
364,000
5
Farakka
h) Buri Gandak
i) Kosi
-
(7,100)
(61,600)
459,000
6
Haldia below the
confluence of Haldi
river
-
j) Dwaraka
k) Ajay
l) Damodar
m) Rupnarayan
n) Haldi
-
(4,700)
(3,200)
(12,200)
(4,400)
(5,300)
493,400
The intensity of maximum discharge in the Ganga rises, as it flows downstream,
in keeping with the inflows of tributaries in different places, as shown in Table 4.5.
Before the Ganga bifurcates near Jangipur, south of Farakka, it is fed abundantly
by all major tributaries, making the total flow and peak discharge quite high at
Farakka, even though the yearly distribution is erratic and not uniform. The total
flow from January to June is only 10% of the total in a year. From July to October,
the flow is more than 85% of the annual discharge at Farakka. The peak flow in
21 years, from 1975 to 1995, was 539,835 million (539.835 billion) cubic metres,
occurred in 1978. The total flow and the peak discharge at Farakka from 1975 to
1995 are shown in Table 4.6; this will be discussed later.
The schematic line diagram of the Bhagirathi-Hooghly with their tributaries is
shown in Fig. 4.4.
The Bhagirathi-Hooghly drew less and less water from the parent river, the Ganga
which was gradually decreasing from the 16th century, owing to aggradation of its
bed and mouth by silt, brought with the flow. Yearwise variations of peak discharge
in the river from 1973 at Jangipur, Berhampur and Purbasthali at 10, 80 and 220 km
from the offtake point at Biswanathpur is shown in Table 4.7.
Search WWH ::
Custom Search