242 FORESTS, WOODS, AND TREES 
(Brecknockshire), a mile north of the town, between 1400 
and 1600 feet elevation. The area is all hill pasture and 
moor, without habitations or farm-steadings; and _ the 
Council owns only 7 acres, the site of the impounding 
reservoir and filter beds. No precautions are considered 
necessary against contamination of the gathering ground. 
Swansea obtains its water supply from two catchment 
areas, aggregating 5156 acres: 
1. Lliw or Velindre area, 2476 acres, between 416 and 
1226 feet elevation, with Lower Lliw, Upper Lliw, and 
Blaenant Dhu reservoirs. The gathering ground, on the 
head-waters of the Lliw River, comprises 2144 acres of 
hill pasture and moor, 193 acres of arable land, 115 acres 
of reservoir sites and works, and 24 acres of plantations, 
recently felled. Only 147 acres are above the 1000 feet 
contour line, being unenclosed mountain pasture. There 
are on the area eighteen farmsteads and habitations, the 
drainage of which is distributed over the land by irrigating 
channels ; and two contaminated streams, which intercept 
the drainage of nine habitations, are conveyed by pipes 
below the reservoir embankment. 
2. Cray area, 2680 acres, between 1000 and 2380 feet 
elevation, all hill pasture and moorland, except six acres of 
plantations and 124 acres of reservoir site and works. No 
less than 1250 acres are above the 1500 feet contour line. 
The catchment area, comprising the head-waters of the Cray 
River, is in Brecknockshire, about 30 miles from Swansea. 
On the area there are two shepherds’ cottages, the drainage 
of which is conveyed below the Cray reservoir by the bye- 
wash channel. The annual rainfall on the area varied in 
1915 from 63°90 inches at 1030 feet to 85°50 inches 
at 2170 feet altitude. 
As there is no filtration, in addition to the precautions 
taken with regard to sewage of habitations, constant patrols 
are in operation on both catchment areas; and any dead 
sheep are collected and properly disposed of by arrangement 
with the farmers. 
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