168 
BATHYMETRICAL SURVEY OF 
in length, the maximum breadth towards the northern end exceeding 
a mile, while the mean breadth exceeds half a mile. Its waters cover 
an area of nearly 2 square miles, and the area draining into it, in- 
cluding Loch Ceo-Glas, is about 8^ square miles. The maximum depth 
of 205 feet was observed about a mile from the southern end, but 
an isolated sounding in 200 feet was recorded about half a mile farther 
north, with shallower water between these two deep soundings. The 
volume of water contained in the loch is estimated at 4599 millions 
of cubic feet, and the mean depth at 84^ feet. The soundings indicate 
generally a gentle shore-slope, the steepest gradient being observed off the 
south-eastern shore at the widest part near the foot of the loch, where a 
sounding in 66 feet was recorded about 120 feet from shore. The floor of 
the loch is somewhat irregular, the contour-lines being in places sinuous 
in character, and the cross lines of soundings, especially in the northern 
half of the loch, show several undulations. Thus the third line of sound- 
ings from the northern end, proceeding from the south-eastern shore, shows 
a deepening of the water to 65 feet, then a shoaling to 46 feet, then a 
deepening to 70 feet, before finally rising towards the opposite shore. 
The fourth line of soundings from the northern end, across the widest part 
of the loch, proceeding also from south-east to north-west, shows that the 
water deepens to 115 feet, then shoals slightly to 112 feet; deepens again 
to 127 feet, shoals again to 96 feet; deepens slightly to 99 feet, shoals 
again to 65 feet ; and then deepens to 76 feet before finally rising on 
approaching the shore. The next line of soundings (the fifth from the 
northern end) shows a shoaling near the middle covered by 105 feet, the 
w^ater deepening on both sides to 122 feet and 140 feet respectively. The 
next line of soundings (the sixth from the northern end) shows a shoaling 
towards the south-eastern shore covered by 60 feet, the water deepening to 
86 feet between it and the shore. The next line of soundings (the seventh 
from the northern end) reveals a shoaling towards the middle of the loch, 
which is the more consjjicuous because it is in close proximity to one of 
the deepest soundings in the loch. Proceeding from the south-eastern 
shore, the soundings deepen gradually to a depth of 154 feet, then a 
slight shoaling to 143 feet was recorded, followed by soundings in 179 feet 
and then 200 feet, when the bottom rises towards the north-western shore. 
The following table, giving the approximate areas between the contour- 
lines and the percentages to the total area, shows a larger area in the zone 
between 100 and 150 feet than in the shallower zone between 50 and 100 
feet, 40 per cent, of the lake-floor being covered by more than 100 feet of 
water : — 
Feet. Acres. Per cent. 
Oto 50 
50 „ 100 
100 „ 150 
150 „ 200 
Over 200 
441 
35-3 
310 
24*8 
317 
25-4 
180 
14-4 
1 
0-1 
