344 BATHYMETRICAL SURVEY OF 



Loch Calavie (see Plate LXXXII.). Loch Calavie (or Calvie) lies 

 about 6 miles to the north-west of Loch Lungard, and only 7 miles from 

 the head of Loch Carron on the west coast of Scotland, at a high 

 elevation among the mountains, the lower slopes of which are covered 

 with peat. The loch trends in a north-west and south-easterly direction, 

 and is considerably over a mile in length, with a maximum width 

 towards the western end exceeding one-third of a mile, whence the 

 breadth gradually decreases on approaching the eastern end. The 

 superficial area is about 167 acres, or a quarter of a square mile, and 

 the area draining into it nearly 2| square miles. The maximum depth 

 of 84 feet was observed in a central position, but rather nearer the 

 western than the eastern end. The volume of water is estimated 

 at 276 million cubic feet, and the mean depth at 38 feet. The loch 

 was surveyed on October 19, 1904, when the elevation was found by 

 levelling from bench-mark to be 1128-35 feet above the sea a little 

 lower than the elevation as determined by the Ordnance Survey officers 

 on August 14, 1866, viz. 1128-5 feet above sea-level. 



Loch Calavie is perfectly simple in conformation, the contour-lines 

 coinciding approximately with the shore-line, though in each case they 

 approach nearer to the western than to the eastern end of the loch, so 

 that the average slope is steeper towards the head of the loch. This 

 is shown in the longitudinal section A-B on the map. The 25 -feet 

 basin is nearly a mile, and the 50-feet basin three-quarters of a mile, 

 in length. The soundings give no indication of any steep offshore 

 slopes, and the average slope between the 25-feet and 50-feet contours 

 is less steep than in shallower water, as indicated in the following 

 table by the larger area beyond the 25-feet line: 



to 25 feet 55 acres 33 per cent. 



25 50 62 37 



50,, 75 39 ,, 24 



Over 75 11 ,, 6 



167 , 100 



Temperature Observations. The following series of temperatures 

 taken in the deepest part of the loch shows that on the date of the 

 survey the whole body of water was practically uniform in temperature, 

 the extreme range being less than 1 Fahr. : 



Surface 47'OFahr.. 



40 feet 46-3 



75 46-2 ,, 



Loch an Tachdaidh (see Plate LXXXII.). Loch an Tachdaidh 

 lies about 2 miles to the east of Loch Calavie, and is almost continuous 

 with Loch an Gead, the stream between them being a very short one, 





