Change
Register
Y
Pedwarau – The 400m Hills of Wales
390m Double
Sub-Pedwarau
Y
Pedwarau are the Welsh hills at or above 400m and below 500m in
height that have a minimum drop of 30m.
The list’s initial compilation was completed in November 2002 and
entitled The 400m Peaks of Wales and
was first published on 19th December 2002 on the RHB Yahoo Group
file database along with the equivalent English and Manx hills, with the file
entitled the 400m hills of England, Isle
of Man and Wales, this file was uploaded by Rob Woodall who later augmented
data from Clem Clements into the database.
Over subsequent years the listing now known as Y Pedwarau has been published on the
v-g.me website and the 5everdene website in list format (22nd
October 2004), available as a downloadable e-booklet and print-booklet version on
the Europeaklist website (23rd May 2013), available as GPS
Waypoints, Google mapping and online hill bagging tick lists on the
Haroldstreet website (6th January 2014) and as of 30th January
2017 publication of Y Pedwarau
commenced on the Mapping Mountains site.
Each publication had an accompanying sub list, but it wasn’t until the Europeaklist publication and the subsequent Haroldstreet publication that a sub list to the 390m Sub-Pedwarau was included.
Each publication had an accompanying sub list, but it wasn’t until the Europeaklist publication and the subsequent Haroldstreet publication that a sub list to the 390m Sub-Pedwarau was included.
The 390m Sub-Pedwarau
are those hills that fail to meet the Pedwar
qualification by 10m or less of height, these are the hills that are 390m
or more and below 400m in height that have a minimum 30m of drop.
This 390m category of sub hill also has a category for
Double Subs, these are the hills that fail to meet the Pedwar qualification by less than 10m of height and also less than 10m
of drop and are below the 400m minimum height threshold, these are the hills
that are 390m or more and below 400m in height that have 20m or more and below
30m of drop, they are known as the 390m Double
Sub-Pedwar hills.
The 390m Double
Sub-Pedwar hills first appeared as a category of hill in the December 2013
publication by Europeaklist, when this version of Y Pedwarau was published there were sixteen hills listed that met
the qualification for 390m Double Sub-Pedwar
status, all of these hills were identified leading up to this publication.
However, since the December 2013 Europeaklist publication
all available online Ordnance Survey maps have been scrutinised and a number of
other hills have been identified that meet this 390m Double Sub-Pedwar qualification, and these have appeared as
updates to the list on the Mapping Mountains site.
With all updates to the list appearing on Mapping Mountains
it became evident that keeping the list up-to-date if hosted on another
person’s website was difficult to say the least, therefore on 30th
January 2017 the Y Pedwarau list
commenced publication on Mapping Mountains with five sub lists accompanying the
main P30 Pedwar list.
Since its original publication Y Pedwarau has changed greatly as the list is now co-authored with Aled Williams, and the numerical data benefits from online mapping, surveys by independent surveyors and the analysis of LIDAR data, whilst also benefiting from meticulous place-name research conducted by Aled, and it seems fitting that the list of Y Pedwarau – The 400m Hills of Wales should now benefit from a detailed Change Register to the 390m Double Sub-Pedwarau, and it is prudent for this Change Register to initially detail the changes to the list since the 2013 publication by Europeaklist.
The Change Register to Y
Pedwarau – The 400m Hills of Wales – 390m Double Sub-Pedwarau appears below
with the reclassifications to the list being detailed chronologically in
receding order.
Change
Register
Y
Pedwarau – The 400m Hills of Wales
390m Double
Sub-Pedwarau
Pen y Bwlch Coch 395.1m at SH 75190 15937
%20-%20LIDAR%20DTM%20hill%201.jpg) |
| LIDAR image of Pen y Bwlch Coch (SH 751 159) |
The
reclassification of this hill from 390m Double Sub-Pedwar to 390m Sub-Pedwar
status was announced via this Change Register with a retrospective Hill
Reclassifications post published on Mapping Mountains on the 21.09.23. The hill was
listed as a 390m Double Sub-Pedwar with 26m of drop when the 1st
edition of the Y Pedwarau was
published by Europeaklist in May 2013.
It was latterly listed with an estimated c 29m of drop, based on the 395m
summit spot height that appears on the Ordnance Survey 1:50,000 Landranger map and
an estimated c 366m bwlch height, based on interpolation of 5m contouring
between 365m – 370m that appeared on the interactive mapping hosted on the OS
Maps website. Its reclassification is due
to detail produced by Joe Nuttall in his surface analysis progamme, with
subsequent LIDAR analysis conducted by the DoBIH team and independently by Myrddyn
Phillips, resulting in a 395.1m summit
height and a 364.9m bwlch height, with these values giving this hill 30.2m of
drop. 390m Double Sub-Pedwar total decreases by one
and confirmed as 26.
Boncyn Nadroedd 389m at SJ 02740 54035
The deletion of this hill from 390m Double Sub-Pedwar status was announced via a Hill Reclassifications post published on Mapping Mountains on the 29.08.20. The hill was previously listed with an
estimated c 23m of drop based on what was thought to be a tiny uppermost 390m
ring contour on the Ordnance Survey 1:25,000 Explorer map and an estimated
bwlch height of c 367m based on interpolation of 10m contouring between 360m –
370m. Its deletion is due to a 389m spot
height that appears on the interactive mapping hosted on the Magic Maps and
WalkLakes websites, implying that the tiny uppermost contour is in fact a spot
height without its adjoined height. 390m
Double Sub-Pedwar total decreases by one and confirmed as 27.
Bryn
Hafod y Llan 398.7m at SH 94590
53115
 |
| LIDAR image of Bryn Hafod y Llan (SH 945 531) |
The addition of this hill to 390m Double Sub-Pedwar status was announced on Mapping Mountains on
the 07.09.19, the hill was previously listed with an estimated c 18m of drop
based on an estimated c 397m summit height and a 379m bwlch height taken from
the spot height that appears on the Ordnance Survey Vector Map Local hosted on
the Geograph website and which is entitled the Interactive Coverage Map. Its addition to 390m Sub-Pedwar status is due to LIDAR analysis initially conducted
by Aled Williams and subsequently by Myrddyn Phillips, resulting in a 398.7m
summit height and a 378.5m bwlch height, with these values giving this hill
20.1m of drop. 390m Double Sub-Pedwar total increases by one and confirmed as 28.
Allt y Genlli 395.8m at SN 98508 95041
The Hill Reclassification post confirming this hill’s
re-instatement to 390m Double Sub-Pedwar status
was published on Mapping Mountains on the 10.05.18, the hill was previously
listed as a 390m Sub-Pedwar due to LIDAR
analysis which had resulted in its reclassification from 390m Double Sub-Pedwar status (see below). This hill was subsequently surveyed by John
Barnard, Chris Crocker and Graham Jacking on the 21.02.18 with a Leica GS15
resulting in a 28.7m drop value. 390m Double Sub-Pedwar total increases
by one and confirmed as 27.
Cyrnau Mawr 391.4m at SN 75154 75006
 |
| Cyrnau Mawr (SN 751 750) is the latest addition to the 390m Double Sub-Pedwar ranks |
The announcement of this hill’s addition to the ranks of the
390m Double Sub-Pedwarau was made on
Mapping Mountains on 02.07.16, the hill was previously not classified although
it had been catalogued with c 16m of drop based on an estimated c 390m summit
height and an estimated c 374m bwlch height.
Its addition is dependent upon the analysis of LIDAR data by Aled
Williams, which was subsequently confirmed with a survey using the TrimbleGeoXH 6000 conducted by Myrddyn Phillips, with the LIDAR analysis giving the
hill 21.6m of drop based on a 391.4m summit and a 369.8m bwlch height, and the
Trimble survey giving the hill 21.6m of drop based on a 391.4m summit and a
369.8m bwlch height, with the correlation between each being excellent. 390m
Double Sub-Pedwar total increases by one and confirmed as 26.
Allt y Genlli 398.9m at SN 98508 95042
The announcement of this hill’s reclassification to 390m Sub-Pedwar status was via the Mapping Mountains site on 24.05.17, the hill was previously listed as a 390m Double Sub-Pedwar with 27m of drop
based on the 394m summit spot height on the Ordnance Survey 1:25,000 Explorer
map and the 367m bwlch spot height on the Ordnance Survey enlarged mapping hosted
on the Geograph website. Its
reclassification is dependent upon the analysis of LIDAR data by Aled Williams
of it, and its southerly adjacent hill of Mynydd
Garth Pwt, with the result being a swap in listed bwlch positions as the
398.9m summit height of Allt y Genlli
is higher than the 397.8m summit height of Mynydd
Garth Pwt, with the heights of the bylchau being 325.7m and 367.3m
respectively, therefore the lower bwlch is the critical bwlch for the higher of
the two hills, with these values giving Allt
y Genlli 73.2m of drop which is sufficient for it to be classified as a 390m
Sub-Pedwar, and with 30.5m of drop Mynydd Garth Pwt also retains its 390m Sub-Pedwar status. This hill has subsequently been surveyed by John Barnard, Chris Crocker and Graham Jackson on the 21.02.18 using a Leica GS15 resulting in a 28.7m drop value and its reinstatement as a 390m Double Sub-Pedwar (see above). 390m Double Sub-Pedwar total decreases
by one and confirmed as 25.
Pt. 391.9m 391.9m at SN 99803 43305
 |
| LIDAR image of Pt. 391.9m (SN 998 433) |
This hill’s deletion from the ranks of 390m Double Sub-Pedwarau was announced on Mapping Mountains on the 28.01.17, the hill was not originally included in this sub category when the Y Pedwarau list was published by Europeaklist in May of 2013, and only later included through its 393m summit spot height on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 373m, which gave this hill a listed drop of c 20m. It’s inclusion as a 390m Double Sub-Pedwar hill (see below) was reported on Mapping Mountains on the 28.02.14, and its subsequent deletion from this sub list is due to analysis of LIDAR data by Aled Williams, with the resulting details being a 391.9m summit and a 372.0m bwlch height, these values give this hill only 19.9m of drop which is insufficient for it to retain its status as a 390m Double Sub-Pedwar hill. 390m Double Sub-Pedwar total decreases by one and confirmed as 26.
Cefn Bach 389.2m at SO 00471 38745
 |
| The northerly summit of Cefn Bach is now deleted from the ranks of 390m Double Sub-Pedwarau |
The deletion of this hill from the ranks of 390m Sub-Pedwarau was announced on the
Mapping Mountains site on 25.01.17. The
hill had been listed as being 391m high with c 22m of drop based on bwlch contouring
between 360m – 370m with an estimated bwlch height of c 369m, and it was listed
as a 390m Double Sub-Pedwar in
deference to its adjacent southerly twin topped 391m map heighted hill at SO 00293
37291 which had been listed as 390m
Sub-Pedwar with 55m of drop. This southerly
hill was subsequently surveyed by Myrddyn Phillips on the 18.08.15 with the
Trimble GeoXH 6000, and the resulting 389.4m summit height and 54.4m bwlch
height was announced on the Mapping Mountains site on 22.09.15. However, it wasn’t until these two hills were
analysed with LIDAR data by Aled Williams that the southerly of the two summits
was confirmed as being 0.2m higher than its northerly neighbour, with the
result of the northerly summit that was listed as a 390m Double Sub-Pedwar being only 389.2m high, which is below the
required height to be classified in this sub category. 390m Double
Sub-Pedwar total decreases by one and confirmed as 27.
Craig Rhiw Berfa 397.2m at SS 94593 90610
This is the first hill to lose its 390m Double Sub-Pedwar status and it is due to the analysis of
LIDAR data by Aled Williams, the announcement of this change in classification
was given on the Mapping Mountains site on 24.12.16, with the resulting height
details being 397.2m summit and 378.4m bwlch, giving this hill 18.8m of
drop. Craig Rhiw Berfa did not appear as
a 390m Double Sub-Pedwar in the list
published by Europeaklist and Haroldstreet
and was only announced as being
added to this classification on 28.02.14 (see below). 390m Double
Sub-Pedwar total decreases by one and confirmed as 28.
Penmaen
Mawr 390.4m at SH 69865 75523
 |
| Penmaen Mawr is now classified as a 390m Double Sub-Pedwar |
This hill’s addition as a 390m Double Sub-Pedwar was announced on the Mapping Mountains site
on 25.07.16, the hill has been extensively quarried and was once the proud
owner of a 1,550ft (472m) summit spot height and a prominence of over 100m,
however it is now reduced in height and prominence and its survey by Myrddyn
Phillips and Aled Williams on 14.07.17 using the Trimble GeoXH 6000 had been
long anticipated, with the resulting 390.4m summit height and 363.5m bwlch
height sufficient for this hill to qualify as a 390m Double Sub-Pedwar with a height over 390m and a drop of
26.9m. 390m Double Sub-Pedwar total increases by one and confirmed as 29.
Craig Rhiw
Berfa 399m at SS 94593 90610
This hill’s qualification to the 390m Double Sub-Pedwar list was announced on the Mapping Mountains site on 28.02.14, the hill joins the ranks of this sub list as it has a 399m
summit spot height on the Ordnance Survey 1:25,000 Explorer map and an
estimated bwlch height of c 378m based on bwlch contouring between 370m and
380m, these values give this hill c 21m of drop and was sufficient for it to be
classified as a 390m Double Sub-Pedwar until
its details were analysed by LIDAR data (see above). 390m Double
Sub-Pedwar total increases by one and confirmed as 28.
Pt.
399m 399m at SO 02704 38530
The 390m Double Sub-Pedwar
status of this hill was announced on the Mapping Mountains site on
28.02.14, and it qualifies for this classification as it has a 399m summit spot
height appearing on the Ordnance Survey enlarged mapping hosted on the Geograph
website and an estimated bwlch height of c 378m based on bwlch contouring
between 370m – 380m, these values give this hill c 21m of drop. 390m
Double Sub-Pedwar total increases by one and confirmed as 27.
Pt.
393m 393m at SN 99813 43255
This hill’s qualification to the ranks of 390m Double
Sub-Pedwar was announced on Mapping Mountains on 28.02.14, and the hill
qualifies for this category with c 20m of drop based on its 393m summit spot
height and an estimated bwlch height of c 373m based on bwlch contouring
between 370m – 380m, and this was sufficient for it to be classified as a 390m Double Sub-Pedwar until its details
were analysed by LIDAR data (see above).
390m Double Sub-Pedwar total
increases by one and confirmed as 26.
Pt. 394m,
The Begwns 394m at SO 14433 44567
The 390m Double
Sub-Pedwar status of this hill was announced on the Mapping Mountains site
on 28.02.14, and its qualification to this sub list is due to the 394m summit
spot height that appears on Ordnance Survey maps and an estimated bwlch height
of c 374m based on bwlch contouring between 370m – 380m, these values give this
hill c 20m of drop. 390m Double Sub-Pedwar total increases by one and confirmed as 25.
Craig Cefn
Llech 396.7m at SN 95275 77145
%20-%20LIDAR%20hill%201.jpg) |
| LIDAR image of Craig Cefn Llech (SN 952 771) |
The change in classification of this hill to 390m Double Sub-Pedwar status was announced on the Mapping Mountains site on 28.02.14. The hill qualifies for this category due to it having 23m of drop, based on the 398m summit and 375m bwlch spot height that appear on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. The numerical details for this hill have subsequently been analysed via LIDAR, resulting in a 396.7m summit height and a 374.4m bwlch height, with these values giving this hill 22.3m of drop. 390m Double Sub-Pedwar total increases by one and confirmed as 24.
Mynydd Hendre Ddu 393m at SH 79627 12091
The classification of this hill to 390m Double Sub-Pedwar status was announced on Mapping Mountains on
28.02.14, and it qualifies for this category of hill as it has a 393m summit
and 369m bwlch spot height that appear on the Ordnance Survey 1:25,000 Explorer
map, giving this hill 24m of drop. 390m Double Sub-Pedwar total increases
by one and confirmed as 23.
Ffridd Dyfnant 399m at SH 99700 16406
This hill was announced as a 390m Double Sub-Pedwar on the Mapping Mountains site on 28.02.14, its
qualification to this category of hill is due to its 399m summit spot height
and the 378m bwlch spot height which gives this hill 21m of drop, with the
latter spot height appearing on the Ordnance Survey enlarged mapping hosted on
the Geograph website. 390m Double Sub-Pedwar total increases
by one and confirmed as 22.
Carreg y
Frân 396m at SH 96101
14049
This hill’s classification as a 390m Double Sub-Pedwar was announced on Mapping Mountains on
28.02.14, the hill qualifies with a minimum 20m of drop based on the 396m
summit and 376m bwlch spot height on the Ordnance Survey 1:25,000 Explorer
map. 390m
Double Sub-Pedwar total increases by one and confirmed as 21.
Pt. c 395m c 395m at SJ 24914 40228
The Mapping Mountains site announced the qualification of
this hill as a 390m Double Sub-Pedwar
on 28.02.14, with the hill’s classification to this category due to it having
an estimated summit height of c 395m based on the small 395m ring contour at
its summit and an estimated bwlch height of c 374m based on bwlch contouring
between 370m – 375m, with these values giving this hill c 21m of drop. 390m Double
Sub-Pedwar total increases by one and confirmed as 20.
Ffridd
Felen 392m at SH 85502 38841
The 390m Double
Sub-Pedwar status of this hill was announced on the Mapping Mountains site
on 28.02.14, the hill qualifies for this category with c 21m of drop based on
the 392m summit spot height on the Ordnance Survey 1:25,000 Explorer map and an
estimated bwlch height of c 371m. 390m Double Sub-Pedwar total increases
by one and confirmed as 19.
Derwydd
Bach 399m at SJ 01776 50304
This hill’s qualification as a 390m Double Sub-Pedwar was announced on the Mapping Mountains site
on 28.02.14, and it qualifies for this category as it has a 399m summit spot
height on Ordnance Survey 1:25,000 Explorer maps and an estimated bwlch height
of c 372m, giving this hill c 27m of drop.
390m Double Sub-Pedwar total
increases by one and confirmed as 18.
Boncyn
Nadroedd c 390m at SJ 02731 54040
The classification of this hill to 390m Double Sub-Pedwar status was announced on the Mapping Mountains site on 28.02.14, and prior to the identification of this hill
qualifying for this category it had not been listed in any other hill list
known to the authors. With an estimated
summit height of c 390m based on a tiny uppermost 390m ring contour and an
estimated bwlch height of c 367m based on contouring between 360m – 370m, this
hill has c 23m of drop and therefore qualifies as a 390m Double Sub-Pedwar. 390m Double Sub-Pedwar total increases
by one and confirmed as 17.
6th
January 2014 – Haroldstreet publishes Y Pedwarau.
390m Double
Sub-Pedwar total confirmed as 16.
23rd
May 2013 – Europeaklist publishes Y
Pedwarau.
390m Double
Sub-Pedwar total confirmed as 16.
Myrddyn Phillips and Aled Williams (January 2017)
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