290 FORESTS, WOODS, AND TREES 
Portrush: gathering ground of 350 acres, all arable 
land and pasture, between 200 and 425 feet elevation, in 
the townlands of Craigahulliar, Knockertotan, Slimag, 
Crossreagh, and Corbally. There are 8 dwelling-houses, 
with farm-steadings attached, on the area, no part of which 
is owned by the Council. “There are many springs on the 
area, which are carefully collected and piped to the reservoir. 
The drainage from some of the arable land and farm-stead- 
ings is rejected. Filtration is good.” 
Portstewart: gathering ground of 185 acres in South 
Mullaghacall, Garrylaban, Cappagh Beg, East Crossreagh, 
and West Tullaghmurry townlands, between 50 and 150 
feet elevation, all arable land except 2 acres of plantations, 
with two farmhouses upon it. No special measures to 
prevent contamination are taken on the gathering ground, 
none of which is owned by the Council; but the water is 
filtered. 
Londonderry *: water supply from three sources : 
1. Creggan Valley, about two miles west of the city; 
three reservoirs; catchment area of 650 acres, between 300 
and 700 feet altitude, all agricultural land, with a number 
of inhabited houses. 
2. Killea Valley, south-west of the last; storage reser- 
voir; catchment area of 456 acres, largely hill grazing, 
but with some arable land. 
3. Tamneymore, south of the city; two storage reser- 
voirs; supply partly from springs situated in agricultural 
land, partly from perforated subsoil conduits in catchment 
areas. 
The Corporation appear to own only the sites of the 
reservoirs. All reports show that the water supply is of 
doubtful quality, the areas being very liable to con- 
tamination. 
The Londonderry Corporation have in Parliament during 
the present session (1918) a scheme for obtaining a new 
water supply from the Glens of Banagher, in the Sperrin 
Mountains. It is proposed to construct two reservoirs, one 
