WATER CATCHMENT AREAS 193 
regards either ownership or the precautions taken against 
contamination. The water is filtered. 
Bradford has most extensive waterworks on the Yorkshire 
moors, with numerous reservoirs and large catchment areas. 
In the following table, the storage reservoirs for domestic 
use are in ordinary type, those which give compensation 
water being in italics. 
: Altitude in 
Watershed. Reservoir. feet. 
Denholme Beck . Thornton Moor 1,241 
Stubden 1,028 
Doe Park 
Hewenden 
River Worth . 5 Leeming 
Leeshaw 
River Wharfe é Upper Barden 
Lower Barden 
Chelker 
Grimwith 
River Aire. Silsden 
River Nidd . : Angram 
Lodge 
High Woodale 
(No reservoir)* 
Gouthwaite 
* The 11,400 acres just shown in the river Nidd watershed comprise 
the catchment areas of five small tributary streams, Ruscoe Beck, How 
Stone Beck, Blayshaw Gill, Ramsgill Beck, and Colt House Beck, the water 
of which is conveyed directly by pipes into the main aqueduct. In addition 
to the preceding storage and compensation reservoirs, there are in the 
vicinity of Bradford the following supply reservoirs without catchment 
areas: Heaton, 523 feet elevation; Horton Bank, 910 feet; Brayshaw, 
975 feet ; Idle Hill, 750 feet ; and Chellow Heights, 845 feet. 
Nearly all the gathering grounds are high moorlands 
reported to be above the reach of pollution from populated 
districts. The Corporation owned in 1906, besides small 
areas (21 acres at Thornton, 1134 acres at Chellow Heights, 
438i acres at Gilstead Filter Beds, 43 acres at Morton, 96 
acres at Silsden, and 994 acres at Grimwith), the following 
large blocks of land: 
O 
