THE FRESH-WATER LOCHS OF SCOTLAND. 101 



LOCHS OF THE GALDENOCH BASIN. 



A VERY small basin on the west coast of Wigtownshire, having only one 

 small, shallow, and apparently artificial, loch (Lochnaw), within the 

 grounds of Lochnaw Castle. The Galdenoch has a course of about three 

 miles in length, flowing from Lochnaw westward to the North Channel. 



Lochnaw (see Plate XXXIX.). A small and nearly round loch, entirely 

 surrounded by trees, 4 miles to the west of the town of Stranraer. It is 

 barely half a mile in length, and one-third of a mile broad. There are 

 several small, stony islands. The bottom is flat, and over the greater part 

 of the loch the depth is 5 or 6 feet. The mean depth is 4 feet, the area 

 about 47 acres, and the volume of water 9 millions of cubic feet. The 

 outflow is by a small burn, with a stony channel, running westward. The 

 area drained is a quarter of a square mile. The surface, on August 22, 

 1903, was 255-3 feet above sea-level, a little higher than the elevation 

 determined by the Ordnance Survey, on April 11, 1893, viz. 255'1 feet. 



The temperature of the water was 61'0 Fahr. 



From the following table it will be seen that in the thirteen lochs 

 under consideration, 1028 soundings were taken, and that the aggregate 

 area of the water-surface is nearly 3^ square miles, so that the average 

 number of soundings per square mile of surface is 302. The aggregate 

 volume of water contained in the lochs is estimated at 1935 millions of 

 cubic feet. The area drained by these lochs is over 75 square miles, 

 or 22 times the area of the lochs. 



