THE FRESH-WATER LOCHS OF SCOTLAND. 277 



Loch Garve (see Plate LXL). Loch Garve lies about 5 miles to the 

 west of Strathpeffer, and to the south-west of the mighty Ben Wyvis 

 (3295 feet). It receives the drainage from a large tract of mountainous 

 country lying to the north and north-west. The body of the loch 

 trends in a north-west and south-east direction, and is somewhat 

 elliptical in outline, while the south-eastern end takes a slight bend 

 to the north-east. The loch is over 1| miles in extreme length, with 

 a maximum breadth of .half a mile, the mean breadth being over 

 one-third of a mile. Its waters cover an area of about 380 acres, or 

 over half a square mile, and it drains an area of 114 square miles an 

 area nearly 200 times greater than that of the loch. The maximum 

 depth of 105 feet was observed near the centre of the loch, but 

 towards the south-western shore. The volume of water is estimated 

 at 721 million cubic feet, and the mean depth at 43 J feet. The loch 

 forms on the whole a simple basin, with a slight shoaling at the 

 position of the bend in the outline of the loch. The 10-feet and 25-feet 

 contours extend from end to end of the loch, following approximately 

 the form of the shore-line ; but the deeper contours are confined to 

 the wide body of the loch, the 50-feet basin being nearly a mile, and 

 the 100-feet basin nearly a quarter of a mile, in length. Off the 

 central portions of both the north-eastern and south-western shores 

 the slope is moderately steep. The longitudinal section A-B on the 

 map is taken along the axis of maximum depth, and shows the slight 

 deepening of the water near the south-eastern end. The areas between 

 the consecutive contour-lines, and the percentages to the total area 

 of the loch, are as follows : 



to 25 feet 131 acres 34 '5 per cent. 



25,, 50 104 27-4 



50,, 75 72 18-8 



75,, 100 64 16-9 



Over 100 , 9 , 2-4 



380 , 100-0 



From this table it will be seen that nearly two-thirds of the entire 

 lake-floor is covered by less than 50 feet of water. Loch Garve was 

 surveyed on August 15, 1902, when the elevation of the lake-surface 

 was found to be 218-8 feet above the sea ; when visited by the Ordnanc-3 

 Survey officers on August 15, 1871, the elevation was 219*6 feet above 

 sea-level. 



Temperature Observations. The following table gives the results of 

 observations made in Loch Garve in 1901 by Mr. Clark, and in 1902 

 by the Lake Survey : 



