252 FOKESTS, 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 9 6 '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 Thorn (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 Lepers tone 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 



