Twmpau - 1000m P30 List
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© 2013 - 2016 Myrddyn Phillips. Non-commercial copying is permitted provided attribution is preserved. Re-use of the presented data in this or another format requires the permission of the blog author.
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Contains OS Data © Crown copyright and database rights 2016, licensed under the OGL (see at http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ ).
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Twmpau - 1000m P30 List
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Carneddau
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Carnedd Llywelyn106411517
SH 68364 64375 (HH)
750
SH 67527 60499 (SH)
Nant y Benglog314Hill name written as Carnedd Llewelyn on current Ordnance Survey maps. Drop value taken from the 314m bwlch height on the Ordnance Survey 1:50,000 Landranger map and the Harvey 1:25,000 Superwalker map.
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Carnedd Dafydd104511517
SH 66283 63045 (TP)
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SH 68039 63583 (SH)
Bwlch Cyfrwy Drum933Bwlch name written as Bwlch Cyfryw-drum on current Ordnance Survey maps. Summit height taken from the triangulation pillar with flush bracket height of 1045.464m once situated on the summit area that no longer exists.
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Glyderau
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Glyder Fawr1000.811517SH 64246 57958 (S)642
SH 64751 55626 (SH)
Gorffwysfa359Bwlch name written as Gorphwysfa on current Ordnance Survey maps. Summit position and 1000.83m height from a Leica Differential GPS survey conducted by G&J Surveys.
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Yr Wyddfa
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NameSummit Height (m)1:50,000 Map1:25,000 MapSummit Grid ReferenceDrop (m)Bwlch Grid Reference
Bwlch Name / Feature
Bwlch Height (m)Notes
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Yr Wyddfa1084.711517SH 60985 54374 (B)1039
NS 76813 78583 (SH)
Forth and Clyde Canal
46The hill is also known as Snowdon. Ordnance Survey historical height data given as 1084.74m to bedrock of mountain. Height to man-made summit plinth of 1085.67m from a Leica Differential GPS survey conducted by G&J Surveys. Old triangulation pillar with flush bracket height of 1086.002m now replaced with weather station fashioned as a circular trig pillar.
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Crib y Ddysgl1065.311517
SH 61078 55157 (TP)
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SH 60787 54904 (SH)
Bwlch Glas993Summit position and 1065.33m height from a Leica Differential GPS survey conducted by G&J Surveys. Triangulation pillar with 1065.885m flush bracket height situated on the summit area. Drop value taken from the 993m bwlch height on the Ordnance Survey enlarged mapping on the Geograph website and from the 1:50,000 Landranger map.
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List Totals: P30s 5 Sub-List 0
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