WATER CATCHMENT AREAS 199 



when the war began, which is held over until more favour- 

 able circumstances return. 



The Annual Beport of the Keighley Waterworks, by 

 M. Ratcliffe Barnett, M.Inst. C.E., published in August 

 1915, gives a complete account of the various undertakings 

 and is accompanied by a map. ' 



Halifax has four moorland gathering grounds, with a 

 total area of 7322 acres, as follows: 



1. In the Hebble Valley, Ogden reservoir, at 990 feet 

 elevation, serving for compensation and domestic supply, 

 has a catchment area of 1140 acres, Mixenden reservoir, 

 875 feet elevation, domestic and general supply, has a 

 catchment area of 190 acres. 



2. In the Luddenden Valley, Fly or Warley reservoir, 

 1350 feet elevation, compensation, has a catchment area of 

 919 acres. Lower and Upper Dean Head reservoirs, 975 

 and 1000 feet elevation, domestic and general supply, have 

 a catchment area of 525 acres. 



3. Widdop reservoir, at 1050 feet elevation, on a stream 

 of the same name, also receives by a tunnel the water of 

 the Greave Valley, and serving for compensation and 

 general supply, has a catchment area of 2223 acres. 



4. Lower Walshaw Dean reservoir, 965 feet elevation, 

 for compensation, and Middle and Upper Walshaw Dean 

 reservoirs, 1043 and 1100 feet elevation, for general supply, 

 have a united catchment area of 2325 acres. 



The whole of the gathering grounds, the lowest point of 

 which is 8 7 5 feet elevation, are either moorland or mountain 

 grazing over Millstone Grit. The Corporation own only a 

 part of the area, viz. 1310 acres, all in the Hebble 

 Valley. The eminent botanists, Mr. W. Crump and 

 Dr. W. G. Smith, who have done so much excellent 

 work in plant ecology and in producing vegetation maps 

 of Yorkshire, etc., strongly urged in 1902 the afforestation 

 of these gathering grounds. In that year 38 acres at 

 Ogden and 12 acres at Mixenden were planted, to which 

 37 acres were added in February 1909. Success was 



