Coed Mawr (SO 013 873) – Hump reclassified to Subhump
This is the twentieth 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.
The hill listed as Coed Mawr in the Humps (SO 013 873) |
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.
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 Hump with 125m
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 183m bwlch spot
height that appears on the Ordnance Survey 1:25,000 Explorer map. 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 SN 99905 88388.
The hill appears under the name of Coed Mawr in the listing
of the Humps, this name appears on
current Ordnance Survey maps applicable to the woodland just to the east of the
summit of the hill. However, local
enquiry and research via the Tithe map finds that the name of Y Gaer is more
appropriate for this hill (see Significant Name Changes).
The hill is adjoined to the Pumlumon group of hills and is
situated overlooking the A 470 road and the Afon Hafren (River Severn) which are
to its east, with the small community of Llandinam at the base and to the
north-east of the hill and the town of Llanidloes towards the west 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 91.4m
drop value for this hill, with its adjacent twin map heighted summit being 0.055m
higher than Coed Mawr, 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 Rhos
Fawr in the listing of the Humps
being 0.11m higher than Coed Mawr, with this survey confirming this hill’s
reclassification from prioritised Hump
to Subhump status.
The reclassification of this hill from Hump to Subhump status
was accepted by Mark Jackson and its new classification augmented in to the
listing of the Humps on 10.05.14.
Using level and staff to determine summit position prior to surveying the hill with the Leica GS15 |
The full details for the hill are:
Name: Coed Mawr (as
listed in the Humps)
Summit Height: 307.1m
(converted to OSGM15)
OS 1:50,000 map: 136
OS 1:25,000 map: 214
Summit Grid Reference:
SO 01352 87384
Drop: 90m (as listed
in the Humps, 91.3m [converted to OSGM15] as surveyed with the Trimble GeoXH
6000)
Myrddyn Phillips (October 2017)
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