Rhos Fawr (SN 999 883) – Subhump reclassified to Hump
This is the twenty first in a series of Hill Reclassification
posts that detail hills whose status has been altered in the listing of the Humps (HUndred Metre Prominences)
through map study and / or surveys that I have instigated.
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| The hill listed as Rhos Fawr in the Humps (SN 999 883) |
The hill name used in this and forthcoming posts is that used
in the listing of Humps, therefore
individual names and their composition may not match those that are used in
listings I am directly associated with.
However, I am of firm belief that listed hill names used by other
authors should be respected when giving detail within other people’s lists,
however inappropriate some hill names may be considered.
This and forthcoming posts are retrospective as many of these
hill reclassifications were initiated from studying the Ordnance Survey
enlarged mapping that is hosted on the Geograph website, or in this instance
from a survey with the Trimble GeoXH 6000, and for the reclassifications that
affected the Humps the first survey
of this hill took place on the 07.02.14.
The listing of Humps
was published in book format by Lulu in 2009 and entitled More Relative Hills of Britain, its author; Mark Jackson gives
credit to a number of people who contributed toward the formation of this list,
these include; Eric Yeaman, Alan Dawson, Clem Clements, Rob Woodall, Bernie
Hughes, Pete Ridges and others. When the
list was published in book format there were 2987 Humps listed with their criteria being any British hill that has
100m or more of drop, accompanying the main list is a sub category entitled Subhumps, with the criteria being any
British hill that has 90m or more and below 100m of drop.
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| More Relative Hills of Britain by Mark Jackson |
The details for the reclassification appear below:
There has been a reclassification to the listing of the Humps (HUndred Metre Prominences)
instigated by a survey with the Trimble GeoXH 6000 and which was later
confirmed by a survey with the Leica GS15.
Prior to the survey with the Trimble GeoXH 6000 Mark Jackson
had listed this hill as a Subhump
with 91m of drop based on the 308m summit spot height that appears on the
Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 217m
bwlch spot height that appears on the Ordnance Survey enlarged mapping hosted
on the Geograph website. This hill was
listed as a twin as a 308m spot height also appears on Ordnance Survey maps for
the hill whose summit is positioned at SO 01352 87384.
The hill appears under the name of Rhos Fawr in the listing
of the Humps, this is the name of a
farm to the west of the summit and not the name of the hill. However, local enquiry and research via Ordnance
Survey maps and the Tithe map finds that the name of Gelli Hir is more appropriate
for this hill (see Significant Name Changes).
The hill is adjoined to the Pumlumon group of hills and is
situated with the A 470 road and the Afon Hafren (River Severn) to its east, and
is positioned between the small community of Caersws to the north-east and the
town of Llanidloes towards the south-west.
This hill and its adjacent twin map heighted summit were
surveyed using a Trimble GeoXH 6000 by Myrddyn Phillips on the 07.02.14
resulting in a 124m drop value for this hill, with its adjacent twin map
heighted summit being 0.055m lower than Rhos Fawr, the hill was then
re-surveyed on the 02.05.14 by John Barnard, Graham Jackson and Myrddyn
Phillips using a Leica GS15 and Trimble GeoXH 6000 resulting in the adjacent
twin map heighted summit named as Coed Mawr in the listing of the Humps being 0.11m lower than Rhos Fawr,
with this survey confirming this hill’s reclassification from Subhump to Hump status.
The reclassification of this hill from Subhump to Hump status
was accepted by Mark Jackson and its new classification augmented in to the
listing of the Humps on 10.05.14.
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| Gathering data with the Leica GS15 at the summit of the hill listed as Rhos Fawr in the Humps |
The full details for the hill are:
Name: Rhos Fawr (as
listed in the Humps)
Summit Height: 307.2m
(converted to OSGM15)
OS 1:50,000 map: 136
OS 1:25,000 map: 214
Summit Grid Reference:
SN 99905 88388 (as listed in the Humps)
Drop: 124m (as listed in the Humps)
Myrddyn Phillips (October 2017)
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