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The Taff Fechan gathering ground, an
area of 8,351 acres,
extends
from the highest point of the Breconshire Beacons (Pen-y-fan, 2,907 ft. above
sea level) in a southerly direction to the reservoir embankment at
Pontsticill.
The rainfall on the catchment
area averages 72.86 inches at the Neuadd Reservoirs and
about five miles south, 58.72inches at Taf Fechan
Reservoir. The rainfall drains off the mountainside to the valley
and is impounded in three reservoirs.
The first reservoir
constructed for the supply of Merthyr Tydfil, was Pentwyn Reservoir
(known locally as Dolygaer Lake) under an act obtained
by the Merthyr Local Board of Health. in 1858.
The Pentwyn Reservoir was
combined into the Taf Fechan reservoir which was completed in 1927. |