1832.] 



brought down by the Ganges River. 



241 



velocity varies as the depth, we have 23,800 feet for the average velocity 

 during the rains, 7435 feet for the winter, and 4425 feet for the hot 

 months. I make no allowance for the decreased velocity of the stream 

 near the bottom, because it is in all probability compensated by the 

 increased weight of matter held in suspension there ; for the decreased 

 velocity at the sides I have allowed by reducing the breadth. Our 

 whole data therefore stands thus : 



Season. 



Depth, 

 ft. in. 



Average j 



breadth as 1 Velocity. 



reduced. | ft. per lionr. 



Cubic feet 

 discharged 



i>fr sc-ond. 



Winter, 5 months, .. .. 

 Hot weather, 3 months,. . 



36 

 176 



2080 

 1780 

 1730 



23800 



7435 

 4445 



494,21.8 

 71,200 

 36,330 



34 grains per wine quart was found to be the average for the rains. 

 Now as a wine quart of water weighs 14544 grains, we have about 

 5 | s th part of solid matter by weight. But as the specific gravity 

 of this cannot be stated at less than 2, we have gssth part in bulk for 

 the solid matter discharged, or 577 cubic feet per second. This gives 

 a total of 6,082,041,600 cubic feet lor the discharge in the 122 days 

 of the rains : — 7.8 grains per wine quart was the weight determined for 

 the five winter months or T g3 ¥ th part in weight, and 5 g r 7 ? th part in bulk, 

 which gives 19 cubic feet per second, or a total of 247,881,600 cubic 

 feet for the whole 151 days of that period : — 3.8 grains per wine quart 

 was the weight allowed for the three hot months, which gives a 3557th 

 part by weight, and a ? 635th part by bulk, or about 4.8 cubic feet per 

 second for the discharge of solid matter, and a total of 38,154,240 

 cubic feet for the discharge during the 92 days. The total annual 

 discharge then would be 6,368,077,440 cubic feet, 



In comparing these observations with some previous ones, I was glad 

 to find that my average for the rains of gigthpart in bidkis nearly the 

 same as that obtained by Captain Forbes, viz. 2 cubic inches in 1728, 

 or 1 cubic foot. 



I have stated the discharge for the hot months at 36,330 c. f. It is 

 stated in the Gleanings at 20,000 at Benares. On looking over the 

 data from which the estimates are drawn, I see that the product of the 

 breadth and depth there given is greater than my own, the two products 

 being to each other nearly as 5 to 8, but that the velocity I have found is 

 to what is there given, nearly as 15 to 5. My measurements were made 

 with care, and as I have been unable to detect any mistake in them, 

 I have given the result of them in the hope that some one may be indu- 

 ced either to verify or contradict them. Again, there is a great difference 

 between the discharge there estimated for the rains and my own results. 



