WATER CATCHMENT AREAS IN SCOTLAND 249 
owned areas, there are scarcely any woods, and no plantation 
schemes are in contemplation. 
I. PertH (West), DUMBARTON, ARGYLL, BUTE, AND 
RENFREW COUNTIES 
Gathering grounds, 59,513 acres, supplying eleven local 
authorities ; 3543 acres owned by two local authorities. 
Glasgow obtains its water supply from two sources, 
Loch Katrine and the Gorbals Waterworks. Loch Katrine, 
situated in the Highlands, 34 miles to the north, provides 
the greater part of the city of Glasgow, as well as Renfrew 
and several small towns and villages, with a remarkably 
pure and abundant supply of water. The original level of 
the lake was raised by embankment 9 feet, so that it now 
has 5000 acres of water surface. An additional supply to 
Loch Katrine is brought by a tunnel from Loch Arklet, 
which has been raised 22 feet above its original level 
and increased in surface from 217 to 551 acres by works 
begun in 1909. The water undergoes no filtration, being 
merely strained through fine wire-gauze netting to prevent 
the passage of sticks and leaves into the pipes. The Loch 
Katrine catchment area, including the Loch Arklet area, is 
27,312 acres in extent, and consists of uncontaminated 
sparsely populated moorland, with a great deal of peaty 
surface. The ownership of the whole gathering ground 
remains in private hands; but in order to secure the 
water supply from pollution, the feuing rights over the 
entire drainage to Loch Katrine and Loch Arklet were pur- 
chased by the Corporation at a cost of £18,300; and the 
owners of the land within that area are prohibited from 
erecting houses or buildings on any part of the gathering 
ground. 
The Glasgow Corporation also utilise Loch Vennachar, 
including Loch Drunkie, with a total catchment area of 
24,686 acres, for compensation water. Recently the 
gathering ground of Glenfinlas, 9600 acres, which forms 
