Fynach Fawr (SN 727 890) – Pedwar reclassified to 400m
Sub-Pedwar
THIS HILL HAS SUBSEQUENTLY BEEN RECLASSIFIED BACK TO PEDWAR STATUS
THIS HILL HAS SUBSEQUENTLY BEEN RECLASSIFIED BACK TO PEDWAR STATUS
There has been a reclassification to the listing of Y Pedwarau with a Pedwar being reclassified to a 400m
Sub-Pedwar due to analysis of LIDAR data by Aled Williams. 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 reclassification affecting
the 400m Sub-Pedwar category. The criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m
and below 500m in height with 20m or more and below 30m of drop.
Prior to analysis of LIDAR data the hill was listed
with c 32m of drop based on the 464m summit spot height on Ordnance Survey
1:25,000 Explorer maps and an estimated bwlch height of c 432m based on bwlch
contouring between 430m – 440m.
The hill is situated in the Pumlumon group of hills with its Cardinal Hill being Banc Llechwedd Mawr (SN 775 898) and is
placed in the Region of Mid and West Wales (Region B, Sub-Region B2), and is
positioned with the small community of Tal-y-bont
to its west and Ponterwyd to its
south south-east.
As the whole upper part of the hill is immersed in
conifer plantation visiting its summit may prove to be a battle, with easiest
access possibly via the north-west where the Ordnance Survey enlarged mapping hosted
on the Geograph website indicates that there is a forest ride following the
course of an old fence line to approximately 150 metres north of the summit.
The name of the hill is Fynach Fawr and its reclassification from Pedwar to 400m Sub-Pedwar 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:
Fynach Fawr
Summit Height: 461.4m
Summit Grid Reference: SN 72715 89052
Bwlch Height: 432.5m
Bwlch Grid Reference: SN 72911 89412
Drop: 28.9m
Therefore, the 461.4m LIDAR data produced for the summit
position at SN 72715 89052 and the 432.5m LIDAR data
produced for the bwlch position at SN 72911 89412 gives
this hill 28.9m of drop which is insufficient for its continued inclusion as a Pedwar.
The full details for the hill are:
Cardinal Hill: Banc
Llechwedd Mawr
Summit Height: 461.4m
(LIDAR data)
Name: Fynach Fawr
OS 1:50,000 map: 135
Summit Grid Reference:
SN 72715 89052
Drop: 28.9m (LIDAR
data)
This reclassification now brings the total for Y Pedwarau to 444 hills with eight
additions, and eleven reclassifications to 400m
Sub-Pedwar status since publication of the list by Europeaklist in May
2013.
The overall total for the 400m
Sub-Pedwarau is now 218 with 20 hills being added and 15 hills being taken
out of this category since publication of the list by Europeaklist in May 2013.
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:
 |
| The forested summit of Fynach Fawr (SN 727 890) |
Myrddyn Phillips and Aled Williams (May 2017)
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