G6 BATHYMETUICAL SURVEY OF 



an independent stream, the Rannoch river. The fishings in these lochs 

 are strictly preserved. 



Loch Doire nam Mart (see Plate XXV.). Loch Doire nam Mart (or 

 Durinemartj or Durinemast) lies about 3J miles north-west of Loch Aline. 

 It trends in a north-west and south-east direction, and is nearly two-thirds 

 of a mile in length, the maximum breadth exceeding a quarter of a mile. 

 Its waters cover an area of about 72 acres, and the area draining into it 

 exceeds 2 square miles. The maximum depth of 48 feet occupies a 

 central position, but rather nearer the northern than the southern end. 

 The volume of water is estimated at 67 million cubic feet, and the mean 

 depth at over 21 feet. The loch was surveyed on August 18, 1904, when 

 the elevation was found to be 37*2 feet above the sea; the Ordnance 

 Survey officers found the elevation to be 36*6 feet above sea-level on 

 March 16, 1867. The loch is simple in conformation, about 57 per cent, 

 of the lake-floor being covered by less than 20 feet of water. 







Loch Arlenas (see Plate XXV.). Loch Arienas (or Ari-Innes) lies 

 about 2 miles north of Loch Aline, and trends in a west-north-west and 

 east-south-east direction, being widest in the central part, and narrowing 

 towards both ends. It is nearly 2 miles in length, with a maximum 

 breadth of three-quarters of a mile, the mean breadth being about one- 

 third of a mile. The shore-line is regular on the northern side, except for 

 the projecting delta at the mouth of the Arienas burn, the southern shore 

 being more irregular. The loch covers an area of about 420 acres, or two- 

 thirds of a square mile, and the area draining into it exceeds 8 square 

 miles, including that draining into Loch Doire nam Mart. The maximum 

 depth of 116 feet was found almost in the centre of the loch. The volume 

 of water is estimated at 1035 millions of cubic feet, and the mean depth at 

 56J feet. The loch was surveyed on August 18 and 19, 1904, when the 

 elevation was 31*3 feet above the sea; on March 4, 1867, the Ordnance 

 Survey officers found the elevation to be 36'0 feet above sea-level, or 

 nearly 5 feet higher than in 1904. Thus in March, 1867, Loch Doire 

 nam Mart was only half a foot higher than Loch Arienas, whereas in 

 August, 1904, it was about 6 feet higher. 



Loch Arienas forms a simple basin, the contour-lines coinciding 

 approximately with the outline, but approaching closer to the northern 

 shore, where the slope is steepest. The following table, giving the areas 

 between the contour-lines, indicates the flat-bottomed character of the 

 basin : 



Feet. Acres. Per cent. 



Oto 25 110 ... 26-1 



26 50 85 ... 20-2 



50 75 78 ... 18-6 



75 100 77 ... 18-5 



Over 100 70 ... 16-6 



420 100-0 



