Saturday, 8 October 2016

Mapping Mountains – Hill Reclassifications – Y Trechol – The Dominant Hills of Wales

Mynydd Coch (SH 804 099) - Lesser Dominant deletion

There has been a deletion from the listing of Y Trechol – The Dominant Hills of Wales due to a survey with the Trimble GeoXH 6000 and which has resulted in the hill being taken out of The Lesser Dominant Hills of Wales list and subjected to a life of rather pitiful non dominance.  The hill is in the group known as Bryniau Dyfi and is situated between the small communities of Aberllefenni to the west and Aberangell to the east, with the expanse of the Dyfi Forest enclosing the hill on its north, east and south.

The Trimble GeoXH 6000 survey that resulted in this hill’s deletion was conducted on the 13th May 2015 in the company of Graham Jackson on a fine late spring day in clear and sunny conditions.

If wanting to visit the hill it can be accessed relatively quickly from its north-east where a forest track leaves the minor road that crosses these hills and makes its way toward the eastern face of Mynydd Coch and open countryside.  However, a more rewarding and extended walk starts from Aberllefenni with the path making its way to the summit through a deciduous wood and toward the 400m Sub-Pedwar of Foel Lwyd before the final ascent of the hill’s southerly upper slopes.

The name of the hill is Mynydd Coch and it had been listed with 33.48% Dominance which was based on its summit spot height of 469m and a bwlch spot height of 312m, with these values giving the hill 157m of drop.  The result of the Trimble GeoXH 6000 summit survey is 468.3m (468.298m, converted to OSGM15) and when coupled with this hill’s 312m map heighted bwlch gives this hill 156m of drop and only 33.31% Dominance, a smidgeon under the minimum qualifying percentage for Lesser Dominance.

The full details for the hill are:

Group:  Bryniau Dyfi

Name:  Mynydd Coch

Dominance:  33.31%

OS 1:50,000 map:  124, 125

Summit Grid Reference:  SH 80458 09952

Summit Height:  468.3m (converted to OSGM15)

Drop Summit to Bwlch:  156m

Drop Bwlch to ODN:  312m 

Mynydd Coch (SH 804 099) now deleted from the Lesser Welsh Dominants list

For details on the survey that resulted in this hill being demoted from the Lesser Welsh Dominant list please click {here}

Myrddyn Phillips (October 2016)

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