244 FORESTS, WOODS, AND TREES 
made on the gathering ground, which would seem to be 
suitable for an extensive scheme of afforestation. 
Briton Ferry Urban District Council obtains its water 
supply from a gathering ground of 240 acres on Pant 
Howellddu and Cefn Coed Mountain, between 500 and 
1000 feet elevation, comprising 60 acres of arable land, 
140 acres of hill pasture, and 40 acres of plantations. 
The area, of which the Council owns 19 acres, has four 
dwelling-houses and farmsteads upon it. It is systematically 
inspected and the water is filtered. 
Glyncorwg Urban District Council obtains its water supply 
in part from the Nantryallor Brook, with a gathering ground 
of 550 acres, situated close to the town, between 900 and 
1000 feet altitude. The whole area is leased by the 
Council and consists of hill pasture and moor, without 
houses, farm-steadings, or plantations. The water is not 
filtered, but the gathering ground is periodically inspected 
to guard against contamination. 
Pontypridd and Rhondda Joint Water Board obtain their 
water supply in part from (1) Pontlluestwen reservoir, with 
a gathering ground of 1484 acres, between 1336 and 1678 
feet elevation, at the head of the valley of the Rhondda 
Fach (Ordnance Survey, Glamorgan Sheet, xi. 13), and 
(2) Castell Nos reservoir, lower in the same valley, with a 
gathering ground of 682 acres, between 1110 and 1695 
feet elevation. The two areas, comprising 2166 acres, are en- 
tirely moorland, and without houses, farmsteads, or plantations. 
The Board own only the sites of the reservoirs, and a 
narrow strip around them. The water is filtered, and no 
other precautions against contamination are taken. 
Mountain Ash Urban District Council obtains its water 
supply from five gathering grounds : 
Clydach Brook . 205 acres, between 932 and 1548 feet elevation. 
Sychnant Brook . 566 ,, ‘5 S50 Bo Leila. re 
Nantyrisfa . ae ELGG. - O50 KR tie lai Sines, 
Darenlas ; A LODO as a 500. Ss00kes. a 
Ffrwd Brook i TAO is. i (00. eee l4A Gee. a 
