32 BATHYMETRICAL SUEVEY OF 



LOCHS OF THE BADCALL BASIN. 



OF numerous small lochs draining into Badcall bay, Loch na h-Airidh 

 Sleibhe was the only one which could be sounded at the time of the visit 

 of the Lake Survey. 



Loch na h-Airidh Sleibhe (see Plate XII.). Loch na h-Airidh Sleibhe 

 lies little more than half a mile to the south-east of Loch a' Bhaid Daraich, 

 the outflowing river running in a south-westerly direction into Badcall 

 bay. The main body of the loch trends north-west and south-east, and is 

 two-thirds of a mile in length, with a maximum breadth of one-third of a 

 mile. Its waters cover an area of about 68 acres, while the area draining 

 into it is about 1J square miles. The maximum depth of 113 feet was 

 observed about a quarter of a mile from the north-west end. The volume 

 of water is estimated at 131 million cubic feet, and the mean depth at 

 about 44^ feet. The loch was surveyed on September 10, 1902, but the 

 elevation of the lake-surface above the sea could not be determined. The 

 loch forms a simple basin, the bottom sloping down on all sides towards 

 the deepest part, which lies towards the north-west end. The shallower 

 contours coincide approximately with the outline of the loch, and in some 

 places deep water approaches close to the shore, as, for instance, off the 

 northern shore, in the vicinity of the deepest part, where a sounding in 43 

 feet was taken about 40 feet from shore, indicating a gradient exceeding 

 1 in 1. The approximate areas between the contour-lines, and the 

 percentages to the total area of the loch, are given in the following 

 table : 



Feet. Acres. Per cent. 



Oto 25 24 ... 36 



25 50 15 ... 22 



50 75 15 ... 22 



75 100 11 ... 16 



Over 100 3 ... 4 



^ 



68 100 



Temperature Observations. The following series of temperatures was 

 taken in the deepest part of the loch at 3.30 p.m. on the date of the 

 survey : 



