Mapping Mountains - Hill Reclassifications – Y Pedwarau - The 400m Hills of Wales

Moelfre (SO 121 759) - 400m Sub-Pedwar deletion

There has been a deletion to the listing of the Y Pedwarau – The 400m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips.

Moelfre (SO 121 759)

The criteria for the list that this deletion applies to are:

Y Pedwarau – The 400m Hills of Wales.  Welsh hills at or above 400m and below 500m in height that have 30m minimum drop, accompanying the main list are five categories of sub hills, with this hill being deleted from the 400m Sub-Pedwar category.  The criteria for this sub category being all Welsh hills at or above 400m and below 500m in height that have 20m or more and below 30m of drop.  The list is co-authored by Myrddyn Phillips and Aled Williams and is published on Mapping Mountains in Google Doc format.

Y Pedwarau - The 400m Hills of Wales by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Moelfre and it is adjoined to the Beacon Hill group of hills, which are situated in the north-eastern part of South Wales (Region B, Sub-Region B2), and it is positioned with minor roads to its south-west and east, and the A483 road farther to its west and the B4356 road farther to its south, and has the small community of Llanbadarn Fynydd towards the north-west.

When the original 400m height band of Welsh P30 hills compiled by Myrddyn Phillips was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category.

Extract from the Ordnance Survey 1:25,000 Explorer map

When the 1^st edition of the Y Pedwarau co-authored by Myrddyn Phillips and Aled Williams was published by Europeaklist in May 2013, the details for this hill were reassessed and it was listed with 20m of drop, based on the 475m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 4552m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map.  However, it was not until the survey with the Trimble GeoXH 6000 that the details for this hill could be accurately re-assessed.

The Trimble GeoXH 6000 gathering data at the summit of Moelfre

The Trimble GeoXH 6000 gathering data at the bwlch of Moelfre

Therefore, the deletion of this hill from 400m Sub-Pedwar status is due to a Trimble GeoXH 6000 summit survey, resulting in a 476.0m summit height and a 456.2m bwlch height, with these values giving this hill 19.8m of drop, which is insufficient for it to be classified as a 400m Sub-Pedwar.    

The full details for the hill are:

Group:  Beacon Hill

Name:  Moelfre

OS 1:50,000 map:  136, 148

Summit Height:  478.0m (converted to OSGM15)

Summit Grid Reference:  SO 12125 75995

Bwlch Height:  456.2m (converted to OSGM15)

Bwlch Grid Reference:  SO 12298 76143   

Drop:  19.8m 

 

For the additions, reclassifications and deletions to Y Pedwarau – The 400m Hills of Wales reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:

 

Y Pedwarau

 

Y Pedwarau – 400m Sub-Pedwarau

 

Y Pedwarau – 390m Sub-Pedwarau

 

Y Pedwarau – 390m Double Sub-Pedwarau

Myrddyn Phillips and Aled Williams (March 2014)