THE FRESH-WATER LOCHS OF SCOTLAND. 95 



the maximum of 29 feet, the central one 22 feet, and the eastern one 

 16 feet. In the channel at the castle the depth is only 5 feet. The 

 mean depth is nearly 10 feet, the area about 113 acres, and the volume 

 47 millions of cubic feet. The drainage area measures 3f square miles. 

 The Sandhill burn flows in at the north-east corner of the loch. The 

 outflow, at the south-west corner, has been dammed up by a bank of 

 stones in order to supply a mill lade; but there is no sluice, and the 

 overflow is divided between the two streams. The surface was 268*8 feet 

 above sea-level on November 6, 1906. 



The temperature at the surface was 45'5 Fahr., and at 25 feet 45'3. 



