Erw Penlan (SO 045 495) – 200m Sub-Twmpau addition
There has been a confirmation of an addition to the 200m Twmpau (thirty welsh metre
prominences and upward) ranks of hills due to a survey with the Trimble GeoXH
6000, with the survey that confirmed this addition being conducted on the 13th
June 2017.
The criteria for 200m
Twmpau status is all Welsh hills at or above 200m and below 300m in height
with 30m minimum drop, with an accompanying sub list entitled the 200m Sub-Twmpau with the criteria for
this sub category being all Welsh hills at or above 200m and below 300m in
height with 20m or more and below 30m of drop, and it is the inclusion of this
hill in the 200m Sub-Twmpau that has
been confirmed.
The hill did not appear in the original Welsh P30
lists on Geoff Crowder’s v-g.me website as it did not meet the criteria then
adopted for the Hills to be surveyed
sub list. The hill was later classified and
listed in the sub category after this was standardised and interpolated drop
values added, and was included when the updates to the 200m Welsh P30s were
published for the Mynydd Epynt group of hills on Mapping Mountains on the 25th
August 2014. The listing this hill is
now a part of is named Twmpau (thirty
welsh metre prominences and upward) and its height, drop and status was
confirmed by a survey with the Trimble GeoXH 6000.
Prior to the survey with the Trimble GeoXH 6000
the hill was listed by the name of Coetgae Fawr with an estimated c 21m of drop,
based on the 213m summit spot height that appears on the Ordnance Survey
1:25,000 Explorer map and an estimated bwlch height of c 192m based on
interpolation of bwlch contouring between 190m – 200m.
The name that this hill is being listed by is Erw
Penlan (see Significant Name Changes) and it is adjoined to the Mynydd Epynt range,
which is situated in the south-eastern part of Mid and West Wales (Region B,
Sub-Region B2) with its Cardinal Hill being Clepyn Melyn (SN 961 464), and it is
positioned above the A 483 road which is to the hill’s north and east, with the
town of Llanfair-ym-Muallt (Builth Wells) positioned to its north.
As the hill does not form a part of designated
open access land permission to visit should be sought, for those wishing to do
so a public footpath connects between minor country lanes to the north and
south of the hill’s summit and proceeds around the upper western part of the
hill.
The full details for the hill are:
Cardinal Hill: Clepyn
Melyn
Summit Height: 212.1m
(converted to OSGM15)
Name: Erw Penlan
OS 1:50,000 map: 147
Summit Grid Reference:
SO 04597 49535
Drop: 20.9m (converted
to OSGM15)
Erw Penlan (SO 045 495) now confirmed as a 200m Sub-Twmpau addition |
Myrddyn Phillips (August 2017)
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