Tywyn Niwbwrch (SH 419 625) – Welsh P15 addition
There has been an addition to the list of The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Tywyn Niwbwrch (SH 419 625) |
The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop. The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019.
The Welsh P15s by Myrddyn Phillips |
When the listing that became known as The Welsh P15s was being compiled, this hill was not included in either the main P15 list or the accompanying P14 sub list, as it possessed no contours of significance on either the Ordnance Survey 1:50,000 Landranger or the 1:25,000 Explorer map.
Extract from the Ordnance Survey 1:25,000 Explorer map |
Therefore, the addition of this hill to Welsh P15 status is due to LIDAR analysis, resulting in a 26.9m summit height and an 8.4m bwlch height, with these values giving this hill 18.4m of drop, which is sufficient for it to be included in the main list of The Welsh P15s.
The full details for the hill are:
Group: Ynys Môn
Name: Tywyn Niwbwrch
OS 1:50,000 map: 114,
115
Summit Height: 26.9m (LIDAR)
Summit Grid Reference: SH 41937 62552 (LIDAR)
Bwlch Height: 8.4m (LIDAR)
Bwlch Grid Reference: SH 41804 62760 (LIDAR)
Drop: 18.4m (LIDAR)
Myrddyn Phillips
(October 2021)
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