130 Memorándum on the great flood of the river Indas. [No. 2, 



the bed of the Indus betvveen those places of aboufc 21 T ^ feet 

 per mile. 



Similarly the height of Baramoola where the Jhelum river leaves 

 the Kashmir valley is about 4930* feet, that of the riverf two 

 miles below Jhelum is about 750 feet above the sea, shewing a differ- 

 ence in height betvveen the two places of about 4180 feet. The 

 distance by the course of the river Jhelum between those two places 

 is about one hundred and ninety-four miles giving an average fall in 

 the bed of the Jhelum of a little over 21 t 5 -q feet per mile. 



Consequently we may assume that the Indus and Jhelum rivers 

 flow at (very nearly) the same average rate between the respective 

 places mentioned. 



With the assistance of Lieut. MelvilleJ I measured the rate of the 

 Jhelum river at Naoshera, one march below Baramoola, in as slow 

 a part of the stream, as there is between Baramoola and Jhelum, 

 and I found the rate to be nearly 690 feet per minute, or about seven 

 miles per hour. And Lieut. Melville quite agreed with me that we 

 liad taken a place where the rate§ was far below the average. The 

 river Jhelum between the points mentioned has in general such rugged 

 and precipitous banks that it was with difficulty that even the above 

 measurement was made. 



The distance from Boonjee to Attok may be taken approxi- 

 mately as about two hundred and twenty miles, and if the flood in 

 question was the one noticed at Boonjee it traversed the distance 

 between those two places between 10 o'clock in the morning of some 

 day before the lOth of August and say 6 A. M. of the lOth August, 

 that is the flood must have taken either twenty-one hours or forty- 

 five or sixty-nine &c. to traverse two hundred and twenty miles, that 

 is, it must have passed Boonjee on 9th, 8th or 7th of August. Had 

 the flood passed Boonjee on the 8th August, it would have taken forty- 

 five hours and would have travelled at the rate of hardly five miles 

 an hour, but it has been shewn above that the average rate of the 



* Baramoola Barometrical height 4938 feet above sea. 

 f G-, T. S. point two miles below Jhelum 758 feet above sea. 

 X Topographical Asst. Great Trigonometrical Survey. 



§ Seven miles an hour may be assumed to have been the minimum rate of the 

 Jhelum river. 



