218 FORESTS, WOODS, AND TREES 
Bottom Plantation. There is no filtration. See W. A. E. 
Ussher, “ Report on Geology of Risby Warren,” printed at 
Scunthorpe in 1912. This gathering ground is not included 
in the total 24,774 acres, of p. 212. 
VII. Severn Basin, DEVoN, AND CORNWALL 
Twenty local authorities and two private companies 
obtain their water supply from gathering grounds agere- 
gating 34,103 acres, of which 10,862 acres are owned by 
nine Corporations. The most important areas owned by 
local authorities are those of Plymouth, Torquay, Paignton, 
and Stratford-on-Avon. A good deal of planting is being 
regularly carried out by the Torquay Corporation on their 
area. Plymouth is contemplating a scheme of afforestation 
after the war. There are considerable plantations on the 
Taunton, Exmouth, Penzance, and Wellington (Salop) areas. 
The Plymouth water catchment area has an interesting 
history, and is exceptional in the amount of water which it 
stores up. 
Church Stretton Urban District Council obtains its water 
supply from a gathering ground of 700 acres, between 900 
and 1550 feet elevation, on the Long Mynd Hill in Shrop- 
shire. The area, of which none is owned by the Council, 
is all hill pasture and moor, without habitations, farmsteads, 
or plantations. The water is not filtered, and no special 
measures are taken on the gathering ground against 
contamination. 
Wellington (Salop) Urban District Council obtains part 
of its water supply from the Wrekin and _ Buckatree 
streams, with a catchment area of 500 acres, between 500 
and 1284 feet elevation. The gathering ground, none of 
which is owned by the Council, comprises 170 acres of hill 
pasture and moor, and 330 acres of plantations, and has 
one small farmstead and a refreshment house upon it. The 
water is filtered, and sterilised by means of chlorine. 
