252 FORESTS, WOODS, AND TREES 
Dunoon obtains its water supply from a gathering 
ground behind the reservoir at the west end of the 
burgh. It is hill pasture grazed by sheep, and comprises 
1100 acres between 242 and 1651 feet elevation. As 
there are no farm-steadings or habitations on this area, 
there is little risk of contamination of the water, which 
is filtered. The Town Council do not own the land, which 
is without trees. The annual rainfall in 1912 was 96:8 
inches. 
Rothesay obtains its water supply from Loch Ascog and 
Loch Dhu, with a catchment area of 919 acres, between 
120 and 450 feet elevation. The Corporation own no 
part of the area, which is made up of 261 acres of arable 
land, 511 acres of hill pasture, and 147 acres of planta- 
tions. There is one farm-steading on the gathering ground. 
The water is filtered, but no other measures are taken to 
prevent contamination. 
Greenock is supplied by the Shaws Waterworks, which 
have a catchment area of about 10,000 acres in the hills 
south of the town, extending to Kelly Dam (640 feet 
altitude), Knockencorsan (1040 feet), Creuch Hill (1446 
feet), and Duchal Moor (1150 feet). Although a consider- 
able part of the area lies between 500 and 1000 feet 
elevation, it is practically all upland moorland, with scarcely 
any trees, and is said to be free from risk of contamina- 
tion. The chief reservoirs are Loch Thom (also known as 
Shaws Water), Gryfe reservoir, and Compensation reservoir. 
The Corporation have merely acquired the rights of the 
area, and own only the sites of the reservoirs. 
Port Glasgow obtains its water supply from two catch- 
ment areas: 
1, Auchendores and Leperstone reservoirs; gathering 
ground at 500 feet elevation, comprising 467 acres of 
arable land and pasture, and 23 acres of plantations, 490 
acres in all. 
2. Knocknairshill and Dougliehill reservoirs; gathering 
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