The first list to the Welsh
200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this
list preceded the list of TuMPs by nine years, the list proved a very useful
resource for the TuMP compilation for this category of hill.
The Welsh 200m P30 list
documents all hills in Wales that are at or above 200m in height and are below
300m in height, to qualify for the main list each hill requires a minimum of
30m of prominence.
The hills listed below are
updates to the Welsh 200m P30 list originally published on Geoff Crowder's
website. To see the original list click {here}
The original published list had
a Sub-List which was entitled ‘Hills to Survey’. This list consisted of all hills in Wales in
the stipulated height band that have a minimum of 20m of prominence, but do not
meet the minimum 30m of prominence to enter the main list, according to
Ordnance Survey map spot heights and contours.
Nowadays the standard Sub-List takes in all hills that have a minimum of
20m of prominence. However, the Hills to
Survey Sub-List discounted hills whose map spot heights gave a drop value of
less than 30m, but more than 20m. By
doing so, the only hills that were Sub-Listed were those that map values
dictated stood a chance of entering the main list, for example; if a hill had a
summit spot height of 250m and a bwlch spot height of 221m, it was not listed
in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand
a chance of main list qualification.
When compiling the Sub-List I
was measuring many hills for P30 status using a basic levelling technique,
please click {here} for more information concerning this. I now know that Ordnance Survey spot heights
have a standard margin of uncertainty of + / - 3m associated with their
accuracy. Therefore many hills that were
not listed in the original Sub-List may have sufficient drop to enter the main
list. Because of this the Sub-List has
been altered to include all hills that have a minimum of 20m of drop but are
not known to attain the minimum 30m of drop to enter the main list.
The hills listed below are
those major amendments to the original Welsh 200m P30 list as it appears on
Geoff’s website. There are many hills
that have been promoted from the Hills to Survey Sub-List to the main list,
whilst there are many additions to the Sub-List now that it has been
standardised to include all 20m minimum but below 30m drop hills.
When the 200m P30 list was
first published it was the first to this category of hills and in some way it
and its other 100m height band lists paved the way for Clem’s data that later
appeared on the RHB file database and then for the TuMPs listing by Mark
Jackson.
As well as the first P30 list
to this height band the list is now the first to include a comprehensive
Sub-List.
TuMP baggers beware; as the
main list also includes P30’s not listed by Mark Jackson, so if you want to
visit all P30’s you’ll have to include some non TuMPs to do so.
The list will be updated on a
weekly basis and will be done so through each Group category, starting from the
north and working south. The nineteenth
Group is Fforest Glud.
Fforest
Glud
North and then east of
the Afon Gwy (River Wye) at SO 229 428 to SO 012 563, continuing east, west and
then south of the Afon Ieithon (River Ithon) to SO 114 653, continuing south of
the River Aran and the Cwm Minwood to bwlch at SO 178 717 and the River Lugg to
the border with England at SO 310 650.
Bordering with Beacon Hill to the north, Pegwn Mawr, Gwastedyn Hill and
the Elenydd to the west, Mynydd Epynt and Y Mynyddoedd Duon to the south and
the border with England to the east.
Twmpau - 200m updates
Yatt
Wood c 277m SO 246 584
This hill was listed in the
original Welsh 200m P30 list as the Ordnance Survey 1:25,000 Explorer map had
an uppermost c 275m ring contour at its summit, and with bwlch contouring
between c 240m – c 245m and a bwlch height estimated as c 243m, it gave this
hill c 34m of drop. However, the Dolyhir
quarry which started on the south-western slopes of this hill has now expanded
and according to latest mapping the natural wooded summit has been quarried
away, leaving a high point at around c 255m.
As this hill no longer has a minimum drop of 30m it is deleted from the
list.
Sub-Twmpau - 200m updates
Timber Hill
Wood 291m SO 288 638
This hill is a new entry to the Welsh 200m Sub-P30
list as it has a summit spot height of 291m and an estimated bwlch height of c
268m, based on bwlch contouring between c 265m – c 270m. These values give this hill c 23m of drop.
Pt. 216m 216m
SO 262 609
This hill takes on the Pt. notation as the blog
author doesn’t know an appropriate name for it.
In part this is a shame as if still naming hills after near houses or
farms there is a building named Knobley to the north-east of this hill’s summit
and Knobley Hill sounds a cracking name for a hill! The bwlch contouring is between c 190m – c
195m with an estimated height of c 193m, giving this hill c 23m of drop.
Pt. 244m 244m
SO 203 434
Positioned just south-westward of Cleirwy (Clyro)
this hill has a 244m summit spot height and an estimated bwlch height of c
222m, based on bwlch contouring between c 220m – c 225m, giving the hill c 22m
of drop.
Pt. 215m 215m
SO 024 558
A hill that is positioned between two woods; Coed
yr Ynys and the Neuadd Plantation, it also has a sawmill situated near to its
summit. As the bwlch height is estimated
as c 193m based on bwlch contouring between c 190m – c 200m, it gives this hill
c 22m of drop.
Pt. 218m 218m
SO 035 571
Another hill that adopts the Pt. notation for its
name as no appropriate name is known for it by the blog author. With a 218m summit spot height and an
estimated bwlch height of c 197m, based on bwlch contouring between c 190m – c
200m, this hill has c 21m of drop.
Pt. 204m 204m
SO 026 546
The summit of this hill is positioned just to the
east of the A470 and is another that follows the Pt. notation for its
name. The bwlch contouring is between c
180m – c 190m, with an estimated bwlch height of c 183m, giving this hill a
drop of c 21m.
Pt. 292m 292m
SO 288 627
This hill’s qualification as a Welsh 200m Sub-P30
is reliant upon the details on the Ordnance Survey enlarged map on the Geograph
website, as this map has a 292m summit spot height and a 272m spot height on
the area of the bwlch, giving this hill 20m of drop.
Pt. 248m 248m
SO 060 601
Positioned near to The Lake and Llandrindod Hall
this hill has a 248m summit spot height and a 228m spot height at SO 061 607 on
the area of the bwlch, with the latter just appearing on the Ordnance Survey
enlarged Geograph map. These values give
this hill 20m of drop.
Pt. c 267m c 267m
SO 117 650
A contentious entry in to the Welsh 200m Sub-P30
list as both summit and bwlch height have been estimated. The summit as c 267m with its uppermost
contour being c 260m, and the bwlch as c 247m, based on bwlch contouring
between c 240m – c 250m. These values
give this hill c 20m of drop.
Pt. 247m 247m
SO 062 579
The Ordnance Survey map indicates that the name of
Bryn-y-groes that appears next to this hill’s summit is applicable to the farm
to the west and not directly to the hill, therefore the Pt. notation is being
used for the name of the hill. The
Ordnance Survey enlarged Geograph map has a 247m summit spot height at SO 062
579, and the height of the bwlch has been estimated as c 227m, based on bwlch
contouring between c 220m – c 230m, giving this hill c 20m of drop.
Next update due on the 25th August 2014
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