1.0 BATHYMETKICAL SUKVEY OF 



crescent-shaped, with the concave side to the south ; the length from east 

 to west exceeds 1J miles, the maximum width in a north and south 

 direction being 1| miles, while the mean breadth is over three-quarters 

 of a mile. Its waters cover an area of about 750 acres (or considerably 

 over 1 square mile), and it drains directly an area of 13 square miles, but, 

 since it receives the outflow from Lochs nan Cuinne and Truid air Sgit- 

 hiche, its total drainage area is about 43^ square miles an area 37 times 

 greater than that of the loch. The maximum depth of 32 feet was 

 observed approximately midway between the eastern and western shores, 

 but much nearer the southern than the northern shore. The volume 

 of water is estimated at 446 million cubic feet, and the mean depth at over 

 13J feet. The loch was surveyed on October 17, 1902, when the level 

 of the surface water was found to be 394-5 feet above the sea ; when visited 

 by the Ordnance Surveyors on July 22, 1869, the elevation of the lake- 

 surface was 392-2 feet above sea-level. 



Loch a' Chlair forms a simple basin; the 10-feet contour-line coincides 

 approximately with the outline of the loch, but the deeper contours 

 approach more nearly to the southern shore, the deepest sounding in 

 32 feet having been taken about 350 yards from that shore. The area of 

 the lake-floor covered by less than 10 feet of water is about 265 acres, 

 or 35 per cent, of the total area of the loch, while the area covered by 

 more than 25 feet of water is about 38 acres, or 5 per cent. The 

 temperature of the surface water on the date of the survey was 47 - 2 Fahr., 

 while readings at 10 feet and at 25 feet gave 47*0. 



Loch Baddanloch (see Plate II.). Loch Baddanloch (or Badenloch, 

 or Baden) is nearly 1| miles in length from north-west to south-east, 

 having a maximum width at the northern end of nearly a mile, narrowing 

 gradually towards the opposite end, the mean breadth exceeding half a 

 mile. Its waters cover an area of about 634 acres, or 1 square mile, and 

 it drains directly an area of 6 square miles, but since it receives the out- 

 flow from Lochs Truid air Sgithiche, nan Cuinne, and a' Chlair, as well as 

 from Loch Allt an Fhearna, next to be considered, its total drainage area 

 is over 51| square miles. The maximum depth of 42 feet was observed 

 about halfway down the loch, but rather nearer the south-western than the 

 north-eastern shore. The volume of water is estimated at 479 million 

 cubic feet, and the mean depth at 17| feet. The loch was surveyed on 

 October 15, 1902 ; the elevation is, of course, identical with that of Loch 

 a Chlair. It may be noted that in the interval of two days between the 

 surveys of the two lochs, the water rose to the extent of 2 feet, but the 

 soundings laid down on the maps have been referred to the same datum 

 level. 



Loch Baddanloch is simple in conformation, with few minor undulations 

 of the lake-floor. The 10-feet contour agrees with the course of the shore- 

 line, and the deeper contours are approximately centrally placed. The 



