10 
BATHYMETRICAL SURVEY OF 
crescent-shaped, with the concave side to the south ; the length from east 
to west exceeds miles, the maximum width in a north and south 
direction being ll 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 431 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 
13| 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 
