WATER CATCHMENT AREAS 245 



The total, 1435 acres, of which the Council owns only 

 40 acres, situated on the Clydacli area, consists of 1085 

 acres of very hilly pasture and moorland, grazed by a few 

 mountain sheep, and 350 acres of plantations. On this 

 account the risk of contamination is considered negligible, 

 and no special measures against it are taken. There are 

 three storage reservoirs, Perthgelyn, Clydach Ynysybwl, and 

 Darenlas ; and only the water from the Darenlas reservoir 

 is filtered. 



Rhondda Urban District Council obtains its water supply 

 from: 



1. An intake on the upper course of the Rhondda 

 River, at 1250 feet elevation, with a gathering ground of 

 820 acres, rising to 1969 feet altitude (Craig-y-llyn). The 

 weir formerly on the Rhondda River is no longer used. 



2. Llyn Fawr, a lake which has been converted into a 

 reservoir of 200,000,000 gallons capacity, with a catchment 

 area of 247 acres, situated between 1208 and 1969 feet 

 elevation. 



3. Nant Ystrad Ffernol, with a gathering ground of 237 

 acres, between 1000 and 1690 feet elevation. 



4. Nant Selsig, Tyisaf Mountain, with a gathering 

 ground of 358 acres, between 900 and 1600 feet 

 elevation. 



The total area, 1662 acres, none of which is owned by 

 the Council, is hill pasture and moorland, grazed only by 

 sheep, and without houses or farmsteads. The water is 

 filtered, and the gathering ground is periodically inspected. 

 Besides Llyn Fawr, there is a small storage reservoir at 

 Tynywaun near Treherbert. 



Aberdare Urban District Council obtains its water supply 

 from three gathering grounds, totalling 1995 acres in 

 extent : 



Nanthir and Nantmoel reservoirs, with a catchment 

 area of 1075 acres, between 900 and 1250 feet elevation, 

 about 4 miles north of Aberdare. 



Bwllfa reservoir, with a catchment area of 570 acres. 



