Curnau Mawr (SN 751 750) – 390m Double Sub-Pedwar addition
There has been an addition to the listing of Y Pedwarau due to analysis of LIDAR data
by Aled Williams and subsequently confirmed via a survey with the Trimble GeoXH
6000. Y Pedwarau is the title for the list of 400m hills of Wales and
takes in all Welsh hills at or above 400m and below 500m in height that have a
minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips
and Aled Williams and it commenced publication on Mapping Mountains on the
30.01.17.
Accompanying the main Y
Pedwarau list are five categories of sub hills, with this hill being included
in the 390m Double Sub-Pedwar category. The
criteria for 390m Double Sub-Pedwar status being
all Welsh hills at or above 390m and below 400m in height with 20m or
more and below 30m of drop.
Prior to analysis of LIDAR data the hill was not
classified but it was catalogued with c 16m of drop based on an estimated c
390m summit height and an estimated c 374m bwlch height, the latter height
based on bwlch contouring between 370m – 380m.
The hill is a part of the Elenydd
range with its Cardinal Hill being Pen
y Garn (SN 798 771) and is placed in the Region of Mid and West Wales
(Region B, Sub-Region B2). The hill is
situated with the B 4574 to its north and the B 4343 to its west and is
positioned between the small communities of Pontarfynach
(Devil’s Bridge) to its north-west and Cwmystwyth
to its east south-east.
For those wishing to visit the summit the whole upper section
of the hill is a part of designated open access land, and this has immediate
access from the B 4343 to the west or from a public footpath from the same road
that intersects with the open access lane.
The name of the hill is Curnau Mawr and its addition to 390m
Double Sub-Pedwar status is due
to the analysis of LIDAR data by Aled Williams.
LIDAR
(Light Detection & Ranging) is highly accurate height data that is now
freely available for much of England and Wales.
Aled’s analysis of LIDAR data gives the hill the
following details:
Curnau Mawr
Summit Height: 391.4m
Summit Grid Reference:
SN 75155 75007
Bwlch Height: 369.8m
Bwlch Grid Reference:
SN 75343 74906
Drop: 21.6m
Therefore, the 391.4m LIDAR data produced for the summit
position at SN 75155 75007 and the 369.8m LIDAR data
produced for the bwlch position at SN 75343 74906 gives
this hill 21.6m of drop which is sufficient for its inclusion as a 390m
Double Sub-Pedwar, with the details from the Trimble GeoXH survey being
391.4m (converted to OSGM15) summit at SN 75154 75006 and 369.8m (converted to
OSGM15) bwlch at SN 75342 24906, giving this hill 21.6m of drop.
The full details for the hill are:
Cardinal Hill: Pen y
Garn
Summit Height: 391.4m
(converted to OSGM15, Trimble GeoXH 6000)
Name: Curnau Mawr
OS 1:50,000 map: 135,
147
Summit Grid Reference:
SN 75154 75006
Drop: 21.6m
The total for Y
Pedwarau remains at 442 hills with nine additions, and fourteen
reclassifications to 400m Sub-Pedwar
status since publication of the list by Europeaklist in May 2013.
The total for the 390m Sub-Pedwarau
remains at 38 hills, whilst the total for the 390m Double Sub-Pedwarau increases by one to 26 hills.
The list of Pedwar
hills is available from the Haroldstreet website (January 2014) with all
subsequent changes detailed on the Mapping Mountains site, with the list also
having commenced publication on Mapping Mountains on the 30.01.17.
For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains
since the May 2013 publication of the list by Europeaklist please consult the
following Change Registers:
 |
| Curnau Mawr (SN 751 750) confirmed as a 390m Double Sub-Pedwar |
For details on the survey that confirmed this hill’s 390m Double Sub-Pedwar addition
Myrddyn Phillips and Aled Williams (July 2017)
Myrddyn Phillips and Aled Williams (July 2017)
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