Mapping Mountains – Hill Reclassifications – Y Trichant

Carneddau (SO 076 543) – Sub-Trichant reclassified to Trichant

There has been a confirmation of a Hill Reclassification to the listing of Y Trichant, with the summit height, drop and status of the hill being confirmed by a Trimble GeoXH 6000 survey which took place on the 6^th October 2017.

The criteria for the listing this hill reclassification affects are:

Y Trichant – Welsh hills at and above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub category entitled the Sub-Trichant consisting of all Welsh hills at and above 300m and below 400m in height that have 20m and more and below 30m of drop.  The list is authored by Myrddyn Phillips and the Introduction to the list and its re-naming and publication history was published on Mapping Mountains on the 13^th May 2017.

The name of the hill is the Carneddau and it is adjoined to the Fforest Glud range of hills which are situated in the eastern part of Mid and West Wales (Region B, Sub-Region B1), and the hill is positioned between the town of Llanfair-ym-Muallt to its south-west and the small community of Hundred House to its east.

Carneddau (SO 076 543)

The hill was listed in the sub category that accompanied the original Welsh P30 lists published on Geoff Crowder’s v-g.me website, when this sub category was standardised and drop values also added this hill was reclassified to a P30 with c 30m of drop, this value was later amended when the Ordnance Survey Interactive Coverage Map hosted on the Geograph website became available online as the bwlch was shown with a 345m spot height, which when coupled with the 376m summit spot height on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps gave this hill 31m of drop.

Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website

The upper section of the hill forms a part of designated open access land with public footpaths approaching it from the north, south and east, with each giving access from the convenience of a relatively high minor lane.

The Trimble GeoXH 6000 gathering data at the summit of the Carneddau (SO 076 543)

The survey result obtained with the Trimble GeoXH 6000 produced a summit height of 375.0m (converted to OSGM15) and a bwlch height of 344.7m (converted to OSGM15), with these values giving this hill 30.3m of drop, which confirms this hill’s reclassification to Trichant status.

The full details for the hill are:

Group:  Fforest Glud

Name:  Carneddau

Summit Height:  375.0m (converted to OSGM15)

OS 1:50,000 map:  147

Summit Grid Reference:  SO 07652 54311  

Drop:  30.3m (converted to OSGM15)

The Trimble GeoXH 6000 gathering data at the critical bwlch of the Carneddau (SO 076 543)

For details on the survey that confirmed this hill’s reclassification to Trichant status

Myrddyn Phillips (December 2017)