30 Report on the Magnetic Survey. [No. 1. 



From 1420 m. to the right shore the increase of the section is 

 248 square meters. 



The depth being less, the velocity seems not much to exceed the 

 present velocity of the main stream, which gives an increase of 

 248 * 1.12. 



= 277 cubic meters. 

 The rest of the river to the left shore increases the section by 

 3270 square meters leaving out some shallow places close to the 

 Kormonasah rock. 



The velocity of this part being, particularly in the arm No. 1 of 

 the section, very rapid is at least 1.5 meters, corresponding to a dis- 

 charge per second of 



4705 cubic meters. 

 Total increase 16320 cubic feet, 



Approximate total quantity during high water, 



25330 cubic meters, 

 or 894700 cubic ft. 



