Monday, 18 April 2016

Mapping Mountains – Hill Reclassifications – Y Pedwarau

Pt. 407.7m (SO 180 692) - Pedwar reclassified to 400m Sub-Pedwar

There has been another reclassification of a Pedwar to 400m Sub-Pedwar status by surveying with the Trimble GeoXH 6000, the third within the last month.  The hill was listed as a Pedwar due to a basic levelling survey (BLS) that was conducted on the 15th December 2003 by Myrddyn Phillips and listed with the minimum qualifying drop of 30m.  It was surveyed with the Trimble on the 8th April 2016 on a fine clear day.

The hill has three potential positions for its bwlch, with only two of these having been surveyed by BLS.  All three and its summit were surveyed with the Trimble GeoXH 6000.  All survey results are given below, and listed from north to south:

Bwlch 1    SO 18847 70099    379.468m (converted to OSGM15)    critical bwlch for Pt. 407.7m

Bwlch 2    SO 18397 69858    379.635m (converted to OSGM15)    critical bwlch for 394.0m high intermediary bump

Pt. 407.7m summit    407.722m (converted to OSGM15)    SO 18077 69277

Bwlch 3    SO 18002 69004    378.278m (converted to OSGM15)    critical bwlch for Weston Bank

BLS bwlch 2 to summit    102ft (31.1m)        Trimble survey    28.1m

BLS bwlch 3 to summit    98.5ft (30.0m)        Trimble survey    29.4m

The critical bwlch for this hill is positioned at Bwlch 1 and gives the hill 28.3m of drop.

The hill is situated in the northern hills of Fforest Glud (Radnor Forest) with its Cardinal Hill being Great Rhos, and is positioned to the north of the A 488 and situated between the small communities of Llanfihangel Rhydithon to its south-west and Llangunllo to its north-east.

The hill is not named on current Ordnance Survey maps and was originally listed by a part invented name of Pen Fraichwen in the Welsh 400m P30 list that was published on Geoff Crowder’s website.  When this list was duplicated to form the category of Tumps listed by Mark Jackson the name was also unfortunately duplicated.  Things have moved on since this time and we are not using invented names for hills, and where no local name or historical name of merit is known we are now using the point (Pt. 407.7m) notation.

The hill can be accessed from southward or northward of its summit where rights of way approach the hill; however the actual summit is not on open access land, so permission to visit should be sought.  The hill can be combined with a number of adjacent hills and an extended circuit can be devised from Bleddfa which is situated eastward from the summit.

This now brings the overall total for Y Pedwarau to 445 hills with five additions, and seven reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.  The hill will be taken out of the main list and added to the 400m Sub-Pedwar list in forthcoming publications.  The list of Pedwar hills is available from the Haroldstreet website.

The full details for the hill are:

Cardinal Hill:  Great Rhos

Summit Height:  407.7m (converted to OSGM15)

Name:  Pt. 407.7m

OS 1:50,000 map:  136, 148

Summit Grid Reference:  SO 18077 69277

Drop:  28.3m (converted to OSGM15)

The list of additions and reclassifications from the Pedwar list since the 1st edition of Y Pedwarau was published by Europeaklist are as follows:



Pt. 407.7m (SO 180 692) now reclassified to a 400m Sub-Pedwar

For details on the survey that reclassified this hill from Pedwar to 400m Sub-Pedwar status please click {here}

Myrddyn Phillips and Aled Williams (April 2016)

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