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 twentieth Group
is Mynydd Epynt.
Mynydd
Epynt
North of the Afon Gwydderig at
SN 770 342 to SN 871 299 and then north of the Afon Wysg (River Usk) to SO 127
211, continuing west of small stream to bwlch at SO 142 225 and the Afon Llynfi
to Llyn Syfaddan (Llangors Lake) and the Afon Llynfi to SO 178 389, continuing
south of the Afon Gwy (River Wye) to SO 034 515 and the Afon Irfon to SN 893 459
and the Afon Cledan to bwlch at SN 840 432, continuing east from bwlch and the
Afon Gwyddon and Afon Bran to SN 770 342.
Bordering with Y Mynydd Du, Fforest Fawr and Bannau Brycheiniog to the
south, Mynyddoedd Duon to the east, Fforest Glud and the Elenydd to the north
and the Elenydd to the west.
Twmpau - 200m updates
Pt.
243m 243m SO 126 320
This hill was originally listed
with a part invented name of Moel Meiadd, as this is wholly unnecessary the name of the hill has reverted
to the Pt notation until further enquiry can take place. The hill qualifies for the Welsh 200m P30
list as it has a 243m summit spot height on Ordnance Surveys maps and a bwlch
spot height of 213m on the Ordnance Survey enlarged Geograph map. These values give this hill 30m of drop.
Sub-Twmpau - 200m updates
Pt. 289m 289m
SN 927 456
Another hill name that follows the Pt notation as
no appropriate name is known for it by the blog author. As the hill has a 263m spot height at the
bwlch on the Ordnance Survey enlarged Geograph map at SN 929 454, it gives this
hill 26m of drop.
Pt. 256m 256m
SO 097 344
With a summit spot height of 256m and a bwlch spot
height of 235m this hill has 21m of drop and therefore qualifies for the Welsh
200m Sub-P30 list. The height of the
bwlch is given as a 235m spot height on the Ordnance Survey 1:50,000 map at SO
097 346 and as a 235m spot height on the Ordnance Survey enlarged Geograph map
at SO 098 347.
Coetgae Fawr 213m
SO 046 495
This hill’s bwlch contouring is between c 190m – c
200m and as its valley to valley contours are placed quite near to one another,
the height of the bwlch has been estimated as c 192m, giving this hill c 21m of
drop.
Pt. 282m 282m
SO 094 412
With a summit spot height of 282m and bwlch
contouring between c 260m – c 270m with an estimated bwlch height of c 262m,
this hill has c 20m of drop.
Pt. 276m 276m
SN 987 491
As no appropriate name is known for this hill by
the blog author it follows the Pt notation.
The bwlch contouring is between c 250m – c 260m with the bwlch centred
on SN 989 491 and estimated to be c 256m high, giving this hill c 20m of drop.
Next update due on the 1st September 2014
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