21.08.18 Cefn yr Ystrad (SO 086 137 [only bwlch
surveyed SO 052 172])
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| The bwlch of Cefn yr Ystrad (summit at SO 088 136, bwlch at SO 052 172) |
With an 8.00am
appointment with Channel 5 News who was filming from the summit of Fan y Big later
in the day, I set off early from my home and crested the minor road that heads
west from the Talybont Reservoir and parked close to its tarmacked edge.
The weather forecast
predicted glimmers of sunshine later in the day, but at this hour cloud and
mist stubbornly hung to the higher summits.
The top of this minor road is also the critical bwlch for Cefn yr
Ystrad, which amongst other listings is classified as a Marilyn and Nuttall,
and therefore as I was passing over it, and if time permitted I wanted to
survey its critical point.
When I pulled up in my
car there was an ethereal feel to the place as mist hung above, cutting out all
extended views, the only thing that moved was an occasional sheep, these were
dew drenched with their coats silken in moisture.
I’d come prepared with a
ten figure grid reference for the critical point from LIDAR analysis conducted
by Aled Williams, and soon zeroed in to this point, which was placed in a bed
of reed grass with gauged out tyre marks from no doubt a farm vehicle that had
passed this way.
Time dictated that I
could take a ten minute data set, and this is what I did, standing away from
the equipment as it beeped away collecting its 600 individual datum points.
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| Gathering data at the critical bwlch of Cefn yr Ystrad |
By the time I approached
the Trimble to close it down 11 minutes of data were gathered and stored, and
as I headed back to my car it was still only 7.25am, and this gave me plenty of
time to drive the short distance down the continuation of the minor road to the
right hand turn leading toward the Upper Neuadd Reservoir and the car park where
I was meeting the crew from Channel 5 News.
Survey Result:
Cefn yr Ystrad
Summit Height: 617.4m (converted to OSGM15) (from subsequent Trimble survey)
Bwlch Height: 439.9m (converted to OSGM15)
Bwlch Grid Reference: SO 05261 17241
Drop: 177.5m
Dominance: 28.75%
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