10 BATHYMETRICAL SURVEY OF 



have been over 4J miles in length. As the level of these two lochs is 

 50 feet higher than the level of Loch Katrine, it has been suggested 

 by Mr. Gale that the water-supply to the city of Glasgow could, if 

 necessary, be increased by connecting these lochs to Loch Katrine by 

 a conduit through the intervening hills. 



Loch Voil (see Plate VII.). Loch Voil has a total length of over 

 3J miles, with a maximum width (near the western end) of about one- 

 third of a mile. The mean breadth is about a quarter of a mile, or 

 422 yards, being 7 per cent, of the length. The waters of Loch Voil 

 cover an area of about 561 acres (0'88 square mile), and those of Loch 

 Doine about 135 acres (0'21 square mile), or together over one square 

 mile, while they drain an area thirty-five times greater, or about 24,600 

 acres (nearly 38| square miles). 



The total number of soundings taken in Loch Voil is 279, the average 

 depth of these being 39 J feet, and the greatest depth 98 feet (or 16 J 

 fathoms). The bulk of water contained in the loch is estimated at 

 1,000,000,000 cubic feet, and the mean depth at 41 feet (or nearly 

 7 fathoms), being 42 per cent, of the maximum depth. The length of 

 the loch is 189 times the maximum depth, and 451 times the mean 

 depth. 



Loch Voil becomes narrower and shallower towards the eastern end ; 

 one must proceed about a mile and a half (or over one-third of the length 

 of the loch) from the eastern end before encountering depths of 50 feet, 

 while deeper water is found towards the western end. The 50 -feet 

 depression extends from quite close to the western end for a distance of 

 2 miles towards the eastern end of the loch, with a maximum width 

 of about a quarter of a mile. Towards the western end of the loch is a 

 considerable area (over half a mile in length by a sixth of a mile in 

 maximum breadth) having depths greater than 90 feet. In this all the 

 deepest soundings are situated (the greatest depth, 98 feet, having been 

 observed in two places). From this depression the bottom of the loch 

 apparently rises very gradually towards the eastern end. 



The area over 50 feet in depth is estimated at about 230 acres, or 

 41 per cent, of the entire area of the loch, while the area between the 

 shore and the 50-feet line is estimated at about 331 acres, or 59 per 

 cent, of the total extent of the loch. 



Loch Doine (see Plate VII.). Loch Doine has a total length of 

 nearly one mile, with a maximum width of over a quarter of a mile ; 

 the mean breadth is about 0'21 mile, or 370 yards, being 21 per cent, of 

 the length. The total number of soundings taken in Loch Doine was 90, 

 the average depth of these being 34 1 feet, the greatest depth being 

 65 feet (11 fathoms). The bulk of water contained in the loch is 

 estimated at 196,000,000 cubic feet, and the mean depth at 33 feet 

 (5J fathoms). The length of the loch is 81 times the maximum depth, 

 and 160 times the mean depth. 



