72 
BATHYMETRICAL SURVEY OF 
cover an area of about 240 acres, and tbe area draining into it exceeds 6 
square miles, including Locb Eilde Beag, lying a quarter of a mile to tbe 
north-east, which was not surveyed. The maximum depth of 100 feet was 
observed near the south-west end, about 150 yards from the north-western 
shore. The volume of water is estimated at 493 millions of cubic feet, and 
the mean depth at 47 feet. The loch was surveyed on May 13, 1903, the 
elevation being approximately 1110 feet above the sea. 
The contour-lines of depth coincide approximately with the outline of 
the loch, but approach nearer to the north-western shore, off which the 
slope is steepest. Near the north-east end there is a slight shoaling 
covered by 70 feet of water, separating. a sounding in 75 feet from the 
main deep basin. The following table, giving the areas between the 
contour-lines, and the percentages to the total area, indicates the general 
regularity and somewhat flat-bottomed character of the basin : — 
Feet. 
Acres. 
Per cent. 
0 to 25 
• . . 
. . . 
65 
27-1 
25 „ 50 
• 
64 
26-6 
50 „ 75 
66 
27-5 
Over 75 
... 
45 
18-8 
240 
100-0 
The temperature of the surface water on the date of the survey was 
47°'0 Fahr., but serials could not be attempted on account of a heavy gale. 
From the table on p. 71 it will be seen that in the ten lochs under con- 
sideration 570 soundings were taken, and that the aggregate area of the 
water-surface is about square miles, so that the average number of 
soundings per square mile of surface is 228. The aggregate volume of 
water contained in the lochs is estimated at 2067 millions of cubic feet. 
The area drained by these lochs is 85J square miles, or 34 times the area 
of the lochs. 
