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 eighteenth
Group is Beacon Hill.
Beacon
Hill
North of the River Lugg
and the border with England at SO 310 650 to bwlch at SO 178 717, continuing
north of the Cwm Minwood and the River Aran to SO 114 653, continuing east of
the Afon Ieithon (River Ithon) to SO 087 827 and the Camnant to bwlch at SO 070
842, following stream to SO 081 859 and the Cwm-y-rhiwdre Brook to Lake Mochdre
and the Mochdre Brook to SO 085 906, continuing south of the Afon Hafren (River
Severn) to SJ 208 005 and the Camlad to the border with England at SO 229 993, continuing
west of the border with England to SO 259 947, continuing south of the Lack
Brook and the Camlad to the border with England at SO 300 922. Bordering with Corndon, the border with
England, Cefn Digoll and Carnedd Wen to the north, Pegwn Mawr to the west,
Fforest Glud to the south and the border with England to the east.
Sub-Twmpau - 200m updates
Ffridd
Faldwyn 248m SO 217 969
A hill that is situated just to
the north-west of Trefaldwyn (Montgomery), the bwlch contouring is between c
220m – c 225m and has been estimated as c 222m, giving this hill a drop of c
26m.
Geufron
Woods 277m SO 178 934
As the summit looks as if it is
just in the wood known as Geufron Woods this name has been used, otherwise the
Pt. notation would have been employed.
The 277m summit spot height comes from the Ordnance Survey enlarged
Geograph map, whilst there is also a 254m spot height from this same map at SO
18305 93275 on the area of the bwlch, this has been judged as being too
high. The Ordnance Survey 1:50,000 map
has a 251m height close to the bwlch, but there doesn’t seem to be a spot
giving its position, therefore as the bwlch contouring is between c 250m – c
255m and estimated as c 252m, this hill is listed with c 25m of drop.
Pt.
258m 258m SO 147 894
This hill is the old Motte and
Bailey on the outskirts of Ceri (Kerry), it has a summit spot height of 258m
and a bwlch spot height of 238m, the latter coming from the Ordnance Survey
enlarged Geogrph map. These values give
this hill 20m of drop.
Next update due on the 18th August 2014
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