THE FRESH-WATER LOCHS OF SCOTLAND. 
409 
The loch is nearly 5 miles in length, has a maximum breadth of 
nearly three-quarters of a mile, and a mean breadth of one-third of a 
mile. It has a superficial area of If square miles. The volume of water 
is subject to great variation, being estimated at the date of the survey 
(April 24 and 25, 1903) at 1134 millions of cubic feet. It drains an area 
of about 21 square miles. Few streams of any importance enter the 
loch. The largest are the Allt na Seabhaig, which formerly flowed 
into the river Gourag, but was diverted into Loch Garth when the dam 
was built, and the Aberchalder burn, which enters the large middle bay 
on the east. When quite full the reservoir overflows into the Gourag. 
FIG. 66. LOCH MHOR, SOUTH-EAST SHORE, WHEN THE WATER IS LOW; ROCKS THAT 
HAVE BEEN DENUDED OF THEIR PEAT COVERING EXHIBIT GLACIAL STRIATION. 
(Photograx>h hy Mr. G. Weftt. From Proc. Roy. Soe. Edin.,” by liermission of the Council.) 
When surveyed the surface was 638*5 feet above sea-level. In accord- 
ance with its artificial origin, the greater part of Loch Mhor is very 
shallow; deep water is only found in the original natural lochs. Two- 
thirds of the whole area is less than 25 feet deep. 
The basin formed by Loch Farraline before the surface was raised 
was fully a mile in length and one-third of a mile broad, with a depth 
of about 40 feet. The breadth has been very little increased by the 
dam. The depth is now 60 feet. The basin is simple, with uniform 
contours and gently sloping sides. The 25-feet contour encloses an 
area of two-thirds of a mile long by one-fifth of a mile broad. The 
