190 FORESTS, WOODS, AND TREES 
between 1146 and 1450 feet elevation, all moorland, 
with two dwelling-houses and farmsteads upon it. None 
of the area is owned by the Council. The water is not 
filtered. 
TV. YORKSHIRE 
Twenty-four local authorities and four private companies 
obtain their water supply from gathering grounds with a 
total extent of 178,239 acres, of which 33,971 acres are 
owned by ten corporations. The principal authorities 
owning water catchment areas in Yorkshire are Leeds, 
Bradford, Oldham, and Batley. Leeds is the only Corpora- 
tion which has carried out planting on a large scale. 
Bradford has always been opposed to any afforestation 
schemes on its extensive areas. On the Halifax gathering 
grounds some plantations, made between 1902 and 1909, 
have not been successful enough to encourage further effort. 
Keighley has postponed the consideration of an afforesta- 
tion scheme till after the war. There are small planta- 
tions on the Huddersfield, Oldham, Batley, and Sheffield 
gathering grounds. In the West Riding of Yorkshire, as in 
South Lancashire, the deleterious effect of smoke on the 
growth of trees must be borne in mind when afforestation 
schemes are under consideration. 
Leeds has four catchment areas, with a total extent of 
39,474 acres, of which 14,700 acres are owned by the 
Corporation. For full particulars of these areas and the 
Washburn Valley afforestation scheme, see pp. 99-101. 
Tees Valley Water Board, which supplies Middlesbrough, 
Stockton-on-Tees, and many villages and towns in Durham, 
obtains its supply (1) from the Hury and Blackton im- 
pounding reservoirs in the valley of the river Balder, 
Yorkshire, with a catchment area of 10,000 acres, between 
860 and 1600 feet elevation ; and (2) from the Grassholme 
impounding reservoir, in the valley of the river Lune, 
Yorkshire, with a catchment area of 18,000 acres, between 
