176 



BATHYMETRICAL SURVEY OF 



The details regarding the lochs in the Inver, Roe, Kirkaig, Polly, 

 and Garvie basins are collected together in the following table for 

 convenience of reference and comparison. Where the elevation above 

 the sea was not determined by levelling from bench-mark, the 

 approximate elevation is given in brackets; in the case of Lochs 

 Urigill, Cam, Lurgain, and Owskeich, the Ordnance Survey level is 

 given with an indication of the date when levelled. 



From this table it will be seen that in the twenty lochs under 

 consideration, 2540 soundings were taken, and that the aggregate area 

 of the water-surface is over 12J square miles, so that the average 

 number of soundings per square mile of surface is 200. The aggregate 

 volume of water contained in the lochs is estimated at about 20,355 

 millions of cubic feet. The area drained by these lochs is about 150J 

 square miles, or twelve times the area of the lochs. 



