264 FORESTS, WOODS, AND TREES 
The Airdrie, Coatbridge, and District Water Trust obtain 
their water supply from two catchment areas, which are 
held as freehold—Rough Rigg, acquired in 1846, and Cowgill 
in 1893. The catchment area of the Rough Rigg reservoir, 
2100 acres, at 687 to 900 feet elevation, lies to the east of 
Airdrie, near Clarkston, and consists of grazing and arable 
land. Cowgill reservoir has a gathering ground of 1390 
acres, between 1000 and 2000 feet, east of Lamington in 
Clydesdale, all under grazing except 13 acres of plantations. 
No schemes for planting trees have been contemplated. 
IV. LoTHIANS, PEEBLES, BERWICK, SELKIRK, AND 
ROXBURGH COUNTIES 
Gathering grounds, 30,382 acres, supplying thirteen 
local authorities. 6690 acres owned by three local 
authorities. 
Edinburgh obtains its water supply from three localities : 
the Pentland Hills, the Moorfoot Hills, and the Talla area 
in Peeblesshire. 
The water supply from the Pentland Hills is mainly 
from springs, none of the surface water being utilised ex- 
cept in the case of the Glencorse area. A description of 
these springs and of the various reservoirs which have been 
built on the north side of the Pentlands to provide compen- 
sation water, etc., is given by Mr. A. Leslie in Proc. Inst. 
Civil Engineers, vol. 74, pp. 91-127 (1883), and need not 
be repeated here, as there is no necessity on hygienic 
grounds to afforest the areas in which these reservoirs are 
situated. Mr. Leslie explains that “the configuration of 
the north side of the Pentlands would not permit of a sur- 
face water scheme being adopted for Edinburgh as the water 
is almost always coloured with peat, and in wet weather 
very much so.” The Glencorse valley, on the south side of 
the Pentlands, the surface water of which is used, has a 
catchment area of 3825 acres, situated between 750 and 
1750 feet elevation, comprising: 
