WATER CATCHMENT AREAS 205 
bourhood of the water courses, to guard against pollution. 
Practically no difficulty has arisen since the establishment 
of the Thrybergh reservoir, from the point of view of pollu- 
tion; and any small difficulty which may arise from time 
to time has up till now been settled mutually.” 
Guisborough Water Company obtain their supply from the 
Wentworth Plantation reservoir, with a gathering ground 
of 550 acres, between 500 and 750 feet elevation. The 
area, which is all moorland, except 50 acres of planta- 
tions, is without habitations or farmsteads. The water 
is filtered, and no other measures are taken against con- 
tamination. 
Yeadon Waterworks Company obtain their supply from 
Reva reservoir, with a gathering ground of 720 acres on 
Hawksworth Moor, between 750 and 800 feet elevation, all 
hill pasture and moorland and without plantations. The 
Company have water rights over the area, of which they 
own only 30 acres. There is one farmstead and two 
cottages on the gathering ground. The water is filtered. 
Thirsk District Water Company, Ltd., obtain their water 
supply from a gathering ground at Boltby, 800 acres in 
extent, between 650 and 1200 feet elevation. The whole 
area is covered with heather and bracken, and is without 
habitations or plantations, none of it being owned by the 
Company. There is nothing to contaminate the water, 
which is strained but not filtered. 
Cleveland Water Company obtain their water supply 
in part from a gathering ground of 1150 acres in Stanghow 
and Moorsholm, between 650 and 920 feet elevation. The 
Company have no rights over the area, except a perpetual 
easement over 42 acres covered by the Lockwood Moorland 
reservoir and filter beds. The gathering ground is all 
moorland without habitations or plantations, and there is 
no chance of contamination of the water. 
