Sunday, 16 August 2015

Mapping Mountains – Significant Height Revisions – 100m Twmpau

Bryn y Beili (SJ 235 643)

This is the fifth post under the heading of Significant Height Revisions, and the following details are retrospective as the Trimble survey that resulted in this height revision was conducted on 8th April 2014.

The fifth major height revision initiated from a survey with the Trimble GeoXH 6000 was conducted in the Bryniau Clwyd range of hills in the centre of Yr Wyddgrug (Mold) which is situated in north-east Wales, the survey was conducted in the company of Mark Trengove over two days, three weeks apart, and it was Mark who proposed that this hill was a candidate for becoming a new P30, his inclination proved correct.  With the first survey concentrating on the bwlch resulting in an unfortunate incident when the Trimble wrestled with a car and was run over, the second survey concentrated on the summit.

The hill is listed in the height band of 100m Twmpau hills and can be accessed from the top of the High Street in Yr Wyddgrug (Mold).  Although the hill is prominent within the town it is almost hidden from view as it rises behind the former Pendref Chapel and is surrounded by a high wall, trees and shrubs.

The name of the hill is Bryn y Beili (Bailey Hill in English).  Its summit height has been increased from its current Ordnance Survey map height, as prior to the survey with the Trimble GeoXH 6000 the hill was not listed as it only had an uppermost ring contour of 130m on current Ordnance Survey maps, with a 135m spot height appearing on lower ground in the centre of a bowling rink on the Ordnance Survey enlarged map on the Geograph website.  Its new summit height is 143.0m which is 8.0m higher than the 135m spot height.

The full details for the hill are:

Cardinal Hill:  Moel y Gamelin

Summit Height (New Height):  143.0m (converted to OSGM15)

Name:  Bryn y Beili

OS 1:50,000 map:  117

Summit Grid Reference:  SJ 23544 64367
Drop:  31.5m

Bryn y Beili, a new P30 and a hill whose height has been significantly revised

For details on the survey that significantly revised the summit height of this hill please click {here}

Myrddyn Phillips (April 2014)

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