WATER CATCHMENT AREAS 207 
Manchester; about 6400 acres are owned by the Man- 
chester Corporation. See full description, p. 98. 
Ashton-under-Lyne, Stalybridge, and Dukinfield (District) 
Waterworks Joint Committee obtain their supply from three 
catchment areas: 
Elevation, 
Acres. Feet O.D. 
Greenfield Valley, intake of Greenfield Brook . a (Le 00 750 to 1700 
Swineshaw Valley, intake at Swineshaw Moor . 1800 600 to 1620 
Chew Valley, above the reservoir . : - - 830 1550 to 1700 
Chew Valley, below the reservoir . : : ce 00 900 to 1700 
Total . . 4730 
The storage reservoirs with their elevations above sea- 
level are: Brushes, 649 feet; Lower Swineshaw, 871 feet; 
Higher Swineshaw, 957 feet; Yeoman Hey, 768 feet; and 
Greenfield, 892 feet. There are also two compensation 
reservoirs— Walker Wood, 588 feet, and Chew, 1600 feet. 
The Joint Committee have purchased and own 2500 
acres, namely, 1310 acres in Greenfield area, 70 acres in 
Swineshaw area, and 1120 acres in Chew area. There is 
one holding on Greenfield area, one holding on Swineshaw 
area, and two holdings on that part of Chew area which 
is not used for domestic supply ; but there are restrictions 
as to manures, and animals kept on the farms, besides close 
inspection. The water is filtered. There are the remains 
of what were formerly plantations, but which now consist 
of a few straggling trees only. This appears to be due to 
atmospheric change, as there is evidence that in days gone 
by trees were very prevalent and flourishing on the 
gathering ground. The engineer, Mr. G. R. Raddin, 
B.E, says it is more satisfactory to have ownership 
control of the area, as there is less trespassing, better 
regulation of indiscriminate rambling, with restrictions as 
to manuring land and grazing of cattle, and with power to 
clear land of farms. 
Stockport obtains its water supply from two catchment 
areas—Lyme Park area, 1400 acres, between 650 feet and 
