14 I. J. Harman—Operations for obtaining [No. 1, 
then the flood discharge is 122,483 cubic feet per second, sectional area 
23,692 superficial feet, and mean velocity 5:2 feet per second. 
For an extreme flood of 18 feet, the discharge would exceed 144,000 
cubic feet, the sectional area be 27,700 superficial feet, and mean veloclty 
5:2 feet per second. 
The next river measured was the Brahmaputra river at about 9 miles 
above Sadiya and half a mile below the mouth of the united stream of the 
Tengapani aud Noa Dihing rivers. There wasa good deal of difficulty 
found in the measurement of this river on account of bad weather and the 
level of the water not remaining constant. The section was made when 
the river was at 3 feet above the low level of the year, but most of the ve- 
locities were measured when the river was at a slightly higher level. These 
facts were kept in view when the calculations were made. 
The measurements were made between April 2nd and 6th of 1878. 
For the section, 61 soundings were made, observations for velocity were taken 
at 14 stations, and there were 165 recorded passages of floating instruments. 
The measured discharge was 66,251 cubic feet per second, sectional 
area 16,396, so that the mean velocity was 4 feet per second. At time of 
measurement the river was 3 feet above the minimum level of the year: the 
increased volume due to this rise was computed to be 32,419 cubic feet per 
second, and sectional area 8,168 superficial feet ; so that the mean low-level 
dry season discharge of the Brahmaputra river below Tengapdni-muk is 
33,832 cubic feet per second, sectional area 8,228 superficial feet, and, con- 
sequently, mean velocity 4:1 feet per second. 
To obtain the minimum discharge of the Brahmaputra at the Brah- 
makund, it will be necessary to deduct from the above figures, the cold sea- 
son mean low-level volume of the Tengapd4ni and Noa Dihing (which 
is stated below to be 3,000 cubic feet per second), and that of the Di- 
garu river which I would estimate from hearsay at 5,000 cubic feet per 
second. Thus the minimum discharge of the Brahmaputra at the Brah- 
makund would be 25,000 cubic feet per second. 
The ordinary high flood of the Brahmaputra below Tengapani-muk 
has been calculated at 16 feet. It gives a discharge of 293,000 cubic feet per 
second, a sectional area of 53,017 superficial feet and mean velocity of flood 
5°5 feet per second. For the flood discharge at the Brahmakund one should 
subtract from above discharge 53,000 cubic feet for the Tengapani and Noa 
Dihing rivers (vide below), and I would estimate 60,000 for the Digaru 
river, which would leave 180,000 cubic feet per second for flood discharge 
of the Brahmaputra at the Brahmakund. 
For an extreme flood of 18 feet the discharge below Tengapdni-muk 
would be over 326,000 cubic feet per second, sectional area 59,000 super- 
ficial feet and mean velocity 5:5 feet per second ; then caleulating by pro- 
