Coed y Gaer (SO 004 843) – Lesser Dominant addition
There has been an addition to the listing of Y Trechol – The Dominant Hills of Wales confirmed by a survey with the Trimble GeoXH 6000; resulting in this hill being included in the Lesser Dominant sub list.
With the criteria for inclusion to the Dominant list being those Welsh P30 hills whose prominence equal or exceed half that of their absolute height, whilst the criteria for the Lesser Dominant list are those additional Welsh P30s whose prominence is 33% or more and below 50% of their absolute height.
The details relating to this hill’s inclusion as a Lesser Dominant hill are retrospective as the confirmation of its addition is dependent upon a survey with the Trimble GeoXH 6000 which was conducted on the 9th February 2014, with the relevant post giving the survey details appearing on Mapping Mountains on the 11th February 2014.
When the sub category of hills accompanying the Welsh P30 lists published on Geoff Crowder’s v-g.me website were standardised with interpolated drop values, this hill was listed with an estimated c 119m of drop based on its 362m summit spot height and an estimated bwlch height of c 243m, these values gave this hill 32.87% Dominance, which was insufficient for it to be classified as a Lesser Dominant. The drop value was subsequently altered due to a 241m bwlch spot height appearing on the Ordnance Survey enlarged mapping hosted on the Geograph website, this resulted in the hill’s Dominance also being amended.
The name of the hill is Coed y Gaer and it is listed in the Pegwn Mawr group and is placed in the Region of Mid and West Wales (Region B, Sub-Region B1) with its Cardinal Hill being Pegwn Mawr (SO 023 812), and is situated above the A 470 road and the Afon Hafren (River Severn) which are to its north, and it is positioned between the small community of Llandinam to the north north-east and the town of Llanidloes to the west.
As the hill is not a part of designated open access land permission to visit should be sought, for those wishing to do so a minor lane to the south of the hill gives access to steep slopes leading to the summit.
The qualification of Coed y Gaer to Lesser Dominant status has been confirmed by the survey with the Trimble GeoXH 6000 resulting in a summit height of 359.9m (converted to OSGM15) and a bwlch height of 238.3m (converted to OSGM15) which gives the hill 121.7m of drop and 33.80% Dominance.
The full details for the hill are:
Group: Pegwn Mawr
Name: Coed y Gaer
OS 1:50,000 map: 136
Summit Grid Reference: SO 00488 84392
Summit Height: 359.9m (converted to OSGM15)
Drop Summit to Bwlch: 121.7m (converted to OSGM15)
Drop Bwlch to ODN: 238.3m
|Gathering data at the summit of Coed y Gaer|
Myrddyn Phillips (August 2017)