WATEK CATCHMENT AEEAS 



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. 



* 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, 113|- acres at Chellow Heights, 

 48|- acres at Gilstead Filter Beds, 43 acres at Morton, 96 

 acres at Silsden, and 99|- acres at Grimwith), the following 

 large blocks of land : 



o 



