Showing posts with label Bwlch Clump. Show all posts
Showing posts with label Bwlch Clump. Show all posts

Friday, 14 October 2016

Mapping Mountains – Significant Name Changes – 200m Twmpau


Bwlch Clump (SJ 170 108)

There has been a Significant Name Change to a hill that is listed in the 200m Twmpau, and the following details are in respect of a hill that was surveyed with the Trimble GeoXH 6000 on the 20th January 2016.

The criteria for the list that this name change applies to are:

200m Twmpau - All Welsh hills at and above 200m and below 300m in height that have 30m minimum drop, with an accompanying sub category entitled the 200m Sub-Twmapu being all Welsh hills at and above 200m and below 300m in height that have 20m and more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.

The hill is a part of the Carnedd Wen range, which is an extensive group of hills situated in the southern part of north Wales, and it is positioned between the small community of Meifod to its north-west and Cegidfa (Guilsfield) to its east.

Bwlch Clump (SJ 170 108)

The hill appeared in the 200m P30 list on Geoff Crowder’s v-g.me website under the partly invented name Pen y Bryn Wood, with an accompanying note stating; Name from wood to the North-East.  During my early hill listing I thought it appropriate to either invent a name for a hill, or use a name that appeared near to the summit of the hill on Ordnance Survey maps of the day.  My preference was to use farm names and put Pen, Bryn or Moel in front of them or as in this instance, use the name of the wood to the north-east of the summit and prefix it with the words Pen y.  This is not a practice that I now advocate as with research either conducted locally or historically an appropriate name for the hill can usually be found.    


Pen y Bryn Wood
    262m
    SJ174109
    125
  239
    Name from wood to the North-East
   

Since publication of these P30 lists on Geoff Crowder’s v-g.me website there have been a number of Ordnance Survey maps made available online, some of these are historical such as the series of Six-Inch maps on the National Library of Scotland website, whilst others are current and digitally updated such as the enlarged map hosted on the Geograph website, and it was the combination of these two maps that confirmed that Bwlch Clump is the name of this hill. 

Extract from the series of Ordnance Survey Six-Inch maps

Extract from the Ordnance Survey enlarged map on the Geograph website

Therefore the name this hill is now listed by in the 200m Twmpau is Bwlch Clump, and this was derived from the series of Ordnance Survey Six-Inch maps and the Ordnance Survey enlarged mapping hosted on the Geograph website.  With the latter mapping only becoming publicly available after the original P30 lists were published on Geoff Crowder's v-g.me website.



The full details for the hill are:

Group:  Carnedd Wen

Name:  Bwlch Clump

Previously Listed Name:  Pen y Bryn Wood 

Summit Height:  263.9m (converted to OSGM15)

OS 1:50,000 map:  125

Summit Grid Reference:  SJ 17063 10813 

Drop:  29.1m (converted to OSGM15)





Myrddyn Phillips (October 2016)





Friday, 5 February 2016

Mapping Mountains – Summit Relocations – 200m Twmpau


Bwlch Clump (SJ 170 108)  

There has been a detwinning of summits that is being detailed as a Summit Relocation initiated by a survey with the Trimble GeoXH 6000 in the list of 200m Twmpau (thirty welsh metre prominences and upward) hills, with the following details being retrospective as the survey that resulted in this summit relocation was conducted on the 20th January 2016.

The hill was originally included in the main 200m P30 list that appeared on Geoff Crowder’s v-g.me website as a single summit listed under the partly invented name of Pen y Bryn Wood (Bryn Wood being the name of the wood to the north-east of the originally listed hill’s summit), with its 262m summit listed at SJ 173 109 which is where this spot height appears on the Ordnance Survey 1:25,000 Explorer map.  The hill later gained a twin summit when the Ordnance Survey enlarged mapping hosted on the Geograph website became available, and which included a 262m spot height for the adjacent hill at SJ 170 108, which was named as Bwlch Clump on this map.  Therefore the main purpose of this survey was to ascertain which of the two summits is higher and separate their twin top status.

The hill is situated in the eastern part of the Carnedd Wen range of hills, and between the small communities of Meifod and Maesmawr, with access to the hill relatively easy as there are public footpaths to the west and east, although its summit does not appear on open access land, therefore permission to visit the high point should be sought.

The names of the two map heighted twin tops are Pt. 262.8m and Bwlch Clump, with the former point (Pt.) notation being used as a name for the hill does not exist on current maps, with the latter name appearing on the Ordnance Survey enlarged Geograph map.

Prior to the survey with the Trimble GeoXH 6000 this hill was listed as a twin top with each 262m map heighted summit appearing at SJ 173 109 and SJ 170 108 respectively.


The survey results for this once twin topped P30 are:


Pt . 262.8m

262.8m (converted to OSGM15) summit at SJ 17354 10914

243.5m (converted to OSGM15) bwlch at SJ 17190 10797

19.4m drop



Bwlch Clump

263.9m (converted to OSGM15) summit at SJ 17063 10813

234.9m (converted to OSGM15) bwlch at SJ 17089 10581

29.1m drop


Therefore the survey with the Trimble GeoXH 6000 confirms that Bwlch Clump is 1.1m higher than Pt. 262.8m, and therefore Bwlch Clump is now listed as the prioritised higher summit.


The full details for the hill are:

Cardinal Hill:  Carnedd Wen

Summit Height:  263.9m (converted to OSGM15)

Name:  Bwlch Clump

OS 1:50,000 map:  125

Summit Grid Reference (confirmed higher summit):  SJ 17063 10813

Drop:  29.1m (converted to OSGM15)


The Trimble GeoXH 6000 gathering data at the confirmed higher summit of Bwlch Clump, with the old twin topped summit of Pt. 262.8m in the background of this photograph

For details on the survey that confirmed the higher of the two map heighted twin tops of this hill please click {here}

Myrddyn Phillips (January 2016)





Thursday, 4 February 2016

Mapping Mountains – Hill Reclassifications – 200m Twmpau


Bwlch Clump (SJ 170 108) - 200m Twmpau reclassified to 200m Sub-Twmpau

There has been a reclassification within the 200m Twmpau (thirty welsh metre prominences and upward) hill list instigated by a survey with the Trimble GeoXH 6000.   The hill has twin map heighted summits and is situated to the south-east of Dyffryn Meifod and to the north-west of the Maesmawr valley and forms part of the Carnedd Wen range of hills.

These details are retrospective, as the Trimble GeoXH 6000 survey that resulted in this hill’s reclassification from a P30 Twmpau hill to a 200m Sub- Twmpau hill was conducted in the afternoon of the 20th January 2016 on a beautiful crisp winter day in good, dry and sunny conditions.

The lower section of the hill can be accessed from public footpaths to its west and east.  However, its summit does not appear on open access ground, therefore permission to visit the high point should be sought.

The hill was originally included in the main 200m P30 list that appeared on Geoff Crowder’s v-g.me website as a single summit under the current 1:25,000 Explorer map height of 262m (SJ 173 109), and listed under the partly invented name of Pen y Bryn Wood (Bryn Wood being the name of the wood to the north-east of the originally listed hill’s summit).  The hill gained a twin summit when the Ordnance Survey enlarged map on the Geograph website included a 262m spot height for the adjacent hill at SJ 170 108, which was named as Bwlch Clump on this map.  According to map contours the drop between each was not sufficient for both to be included as P30s, with interpolation suggesting c 19m of drop.

Therefore the purpose of this survey was to ascertain which of the two summits is higher and separate their twin top status, and see if the drop between each was sufficient for the lower Trimbled summit to be included as a Sub-Twmpau and ascertain if the higher summit retained its P30 status, as the listed drop value for this hill was c 30m, which was based on bwlch contour interpolation.


The survey results for this once twin topped P30 are:


Pt . 262.8m (originally listed as Pen y Bryn Wood)

262.8m (converted to OSGM15) summit at SJ 17354 10914

243.5m (converted to OSGM15) bwlch at SJ 17190 10797

19.4m drop



Bwlch Clump

263.9m (converted to OSGM15) summit at SJ 17063 10813

234.9m (converted to OSGM15) bwlch at SJ 17089 10581

29.1m drop


Therefore the survey with the Trimble GeoXH 6000 confirms that Bwlch Clump is 1.1m higher than Pt. 262.8m, and that Pt. 262.8m has 19.4m of drop and is not listed as a Sub-Twmpau, and that Bwlch Clump has 29.1m of drop and is therefore reclassified to a 200m Sub-Twmpau.


The full details for the new status of this hill are:


Cardinal Hill:  Carnedd Wen

Summit Height:  263.9m (converted to OSGM15)

Name:  Bwlch Clump

OS 1:50,000 map:  125

Summit Grid Reference:  SJ 17063 10813

Drop:  29.1m (converted to OSGM15)


Pt. 262.8m - now reclassified from a twin topped P30 to a non Sub-Twmpau.  How the mighty fall!!!

Bwlch Clump - now reclassified from a twin topped P30 to a 200m Sub-Twmpau

For details on the survey that resulted in this hill being reclassified from a 200m Twmpau to a 200m Sub-Twmpau please click {here}


Myrddyn Phillips (January 2016)





Monday, 1 February 2016

Mapping Mountains – Trimble Surveys – Carnedd Wen


20.01.16  Broniarth (SJ 160 117), Broniarth (SJ 166 120), Bank Wood (SJ 171 115), Pt. 262.8m (SJ 173 109) and Bwlch Clump (SJ 170 108)  

Broniarth (SJ 160 117)

With such a beautiful cold chilled day forecast I thought it a shame to miss out on the delights of a hill or two.  Examining the maps I noticed a small group of 200m Twmpau hills that I had not visited, these were situated between Meifod and Maesmawr, and would only take a half hour or so to navigate the narrow country lanes to reach their base.

I parked next to a farm at SJ 158 112 having asked permission to do so from a friendly woman who was hanging out of a house window opposite and who had quickly noticed me wandering the lanes.  I sauntered over to introduce myself and we talked for a number of minutes, she kindly told me that the first hill, which was rising above the valley in front of me, was known locally as Broniarth.

As I waved the woman goodbye I gathered all my stuff from the car, locked it and wandered down the lane to a cross road where I forked right and admired the frost encrusted detail of leaves hanging on a becalmed hedgerow.

Delicate frost on leaves

A footpath through part of a wood gained initial height before it deposited me on to a clean chilled hillside, frost predominated, a tranquil and silent landscape fell away down to the shaded valley below.  Elongated shadowed greyness stretched from deposits of trees as rolling fields edged their way across the land.  It felt good to be out in this wonderful part of the country.

Low sun casting early morning shadow

The Breiddin hovering above misty haze

I clambered a wired fence to reach the upper section of Broniarth which is brackened, with sapling trees giving convenient hand purchase to its morass of undergrowth.  The hill’s high point was in a small clearing and as I set the Trimble up on top of my rucksack to gather its allotted five minutes of data I looked out in to the haze of white and low sun beyond, trying to distinguish the hills on my planned route ahead.

Gathering data at the summit of Broniarth

Following a path amongst the brown and forlorn bracken I headed down to a difficult fence crossing and back on to the frost encrusted field, my planned route headed down toward buildings that are named Fron-las on the map, and ahead lay an elegantly shaped green hill that I thought needed Trimbling.  As this walk was only planned late the previous evening I did not have much time to study the map and this hill looked as if its Sub status needed checking.

The critical bwlch for this next hill was placed directly straight lined between it and the summit of Broniarth and as the Trimble gathered data I marvelled at the highlighted frost that brought a graceful feel to the surroundings.  Next stop the summit.

Gathering data at the critical bwlch of the lower Broniarth hill

Wandering up the hill’s symmetrically shaped western slopes the Berwyn stretched off in to the distance, crowned in white and rising above a greened and wooded land.  The summit of this hill proved easily identifiable and as the Trimble gathered data I took a number of photographs with the southern slopes now bathed green contrasting against the northern slopes still shadowed and firmly white.

The Berwyn, snow-capped away in the distance


Gathering data at the summit of the lower Broniarth hill

Having packed the Trimble away I headed directly down to a gate which gave access on to a narrow road, I called at Fron-las to make place-name enquiries but unfortunately no one was in.  The next point to survey was the critical bwlch for Broniarth and this proved to be in a field, a couple of metres from a gate beside a corner in the lane.  As the Trimble gathered its data, I stood beside the narrow road hoping that no one would appear from the adjacent farm, but all the land and its occupants were quiet, seemingly not a breath stirred, just low sun, blue sky, chilled freshness and beautiful small hills to explore.

Gathering data at the critical bwlch of Broniarth

A track led from the lane up toward my next hill; Bank Wood, I left the track to walk through a field to the edge of the upper part of the wood.  From the direction that I approached the high point of Bank Wood appeared symmetrical and was framed with mature deciduous trees against the greens of cropped fields with the shape of the hill rounded.  I find symmetry appealing, it is eloquent to the eye, uncomplicated, and nature often offers this.

Bank Wood - rounded and symmetrical, and pleasing to the eye

Once in the wood I followed a narrow path from a partly collapsed gate up to the high point.  Within a few minutes the Trimble was placed on my rucksack and the long waiting process for the equipment to attain its 0.1m accuracy before data should be locked, started.  I checked this accuracy level a couple of times and scampered back down below the height of the Trimble when I saw that the 0.1m mark had not been reached, I waited for what must have been 15 minutes for the accuracy to be attained, I cannot remember much of this time as my mind happily wandered in abstract and welcoming thought.

The upper slopes of Bank Wood


Gathering data at the summit of Bank Wood

Another bwlch lay between me and the next hill, and its critical point to be surveyed proved fun to find.  Leaving the delights of Bank Wood behind I sauntered down a field and found two foot stiles giving access to an enclosed footpath which led to another foot stile and an open field, I followed this parallel to the enclosed footpath heading toward a ten figure grid reference that I had quickly scribbled for where this next bwlch may lie.  When I arrived at this point the lay of land compared to where the critical bwlch was placed was all wrong, and therefore I back-tracked following a stream uphill to where I’d encountered the first foot stile ten minutes before.  Examining the map I realised that this next bwlch had at least two positional possibilities for where its critical point lay, and I’d been very close to each as I’d wandered around in the field parallel to the enclosed footpath, however, the point where I was standing was also a low point, of sorts, on the hill to hill traverse, so I set the Trimble up to gather another data set before quickly heading off to Trimble the other two points.

Bwlch Clump from one of the preceding bwlch surveys

The last of these potential bwlch positions was placed under the frost encrusted southern slopes of my next hill, this is unnamed on the map, so is listed under the point (Pt. 263m) notation.  Although listed as a P30 in the original list that appeared on Geoff Crowder’s v-g.me website, it is now a twin top as the Ordnance Survey enlarged map on the Geograph website also gives its adjacent hill; Bwlch Clump, a summit spot height of 262m.  I hoped to Trimble each and separate their short lived twinness.

Gathering data at the last of the bwlch options with the summit of Pt. 262.8m (SJ 173 109) in the background

The next summit proved easy to find and is situated in a closely cropped grassy field, beyond lay the bwlch between each map heighted twin top.  This again is situated in a closely cropped grassy field just above the farm of Bwlch Aeddan.

Gathering data at the summit of Pt. 262.8m (SJ 173 109)

As the Trimble gathered another five minute data set I listened to a van’s starting motor being worked on in the farm yard below, this was one of only a few sounds that I’d heard during the whole walk.

Gathering data at what proved to be the critical bwlch of Pt. 262.8m (SJ 173 109)

Beyond the bwlch lay the wooded top of Bwlch Clump, a name that appears on the Ordnance Survey enlarged Geograph map.  Between me and it were two gates, as I entered the wood the ground rose steeply to a slender greened ridge which had been quarried, with the spoil topped up in a high clump of waste.  I set the Trimble up on top of my rucksack and waited until the accuracy level had descended to the required 0.1m, this took about 20 minutes to attain, but I was in no rush and although a slight breeze had picked up I was warm enough in the wood and patiently waited until five minutes of data were collected. 

Gathering data at the summit of Bwlch Clump

Just one survey remained and that was a bwlch that according to the map lay somewhere around the confines of Bwlch Aeddan farm.  When I arrived in the farm yard I approached the farmer and we chatted for a number of minutes, he was completely at ease with me wandering around trying to find where the critical bwlch lay, and after doing a circuit of the paved track and road that leads from the farm yard to the narrow lane which would eventually lead me back to my car, I found where I thought the critical bwlch lay, positioned the Trimble on top of my rucksack and hunkered down for what I imagined would be another long wait as it was positioned next to an outbuilding which had large trees above it.  Miraculously the 0.1m mark was attained very quickly and I pressed ‘Log’, scampered away and waited for its five minutes of data to be stored.

Feeding time at Bwlch Aeddan farm


The last survey of the day - gathering data at what proved to be the critical bwlch of Bwlch Clump

All that remained was a contented wander down the lane to my awaiting car.  On my way home I drove toward Maesmawr, instead of my inward route to Meifod, this outward route took me past Pant Cottage, known locally as The Kennels.  This old house with its earthen track leading to it from the adjacent narrow and steep country lane was where my Grandfathers family lived their lives, it is a house I have not visited for over 11 years, since I scattered some of my father’s ashes in its grounds.  I stopped, paid my respects and looked out past the house to the setting sun, sinking, winter like, down to a frosted earth below.


  
Survey Result:



Summit Height:  279.2m (converted to OSGM15)

Summit Grid Reference:  SJ 16075 11772

Bwlch Height:  225.9m (converted to OSGM15)

Bwlch Grid Reference:  SJ 16965 11712

Drop:  53.3m

Dominance:  19.08%




Broniarth

Summit Height:  267.9m (converted to OSGM15)

Summit Grid Reference:  SJ 16648 12055

Bwlch Height:  246.5m (converted to OSGM15)

Bwlch Grid Reference:  SJ 16446 11940

Drop:  21.5m (200m Sub-Twmpau status confirmed)

Dominance:  8.01%





Summit Height:  266.8m (converted to OSGM15)

Summit Grid Reference:  SJ 17129 11574

Bwlch Height:  226.7m (converted to OSGM15)

Bwlch Grid Reference:  SJ 17138 11121

Drop:  40.1m

Dominance:  15.02%




Pt. 262.8m

Summit Height:  262.8m (converted to OSGM15) (de-twinned becoming non prioritised summit)

Summit Grid Reference:  SJ 17354 10914

Bwlch Height:  243.5m (converted to OSGM15)

Bwlch Grid Reference:  SJ 17190 10797





Summit Height:  263.9m (converted to OSGM15) (de-twinned becoming prioritised summit)

Summit Grid Reference:  SJ 17063 10813

Bwlch Height:  234.9m (converted to OSGM15)

Bwlch Grid Reference:  SJ 17089 10581



For further details please consult the Trimble survey spreadsheet click {here}