Sunday, 7 October 2018

Mapping Mountains – Trimble Surveys – Mynyddoedd Duon



12.07.18  Hatterrall Hill (SO 308 256)

Hatterrall Hill (SO 308 256)

Hatterrall Hill lies at the southern end of an elongated ridge, which is one of four that make up the hill range of Mynyddoedd Duon.  Many a mile away to its north Hay Bluff and its trig pillar looks out across the southern part of mid Wales from an escarpment edge plunging to gentle green land below.  Both hills are a part of the same ridge that nowadays takes on the name of its southerly outlier; Hatterrall Ridge.

This hill formed a part of a two hill and two walk day with Mark, who had driven to my home in Welshpool in decidedly murky conditions as the heat of the last month had given way to grey murk and rain which accompanied us for much of the journey south, but with a weather forecast for clearing conditions we were hopeful that our planned hills for the day would be free of cloud and rain.

We started the walk from Llanthony Priory where its ruins stand in tranquil farmland at the southern end of Dyffryn Ewyas.  The priory dates to around 1100 and was reputedly founded by the Norman nobleman; Walter de Lacy, it is now in the guardianship of Cadw.

Llanthony Priory

Llanthony Priory

Signposts to the hill pointed us up through grazing fields toward Wirral Wood where the shaded canopy gave respite from the muggy conditions that were already in evidence on open land.

Llanthony Priory from the approach to Wirral Wood

The meandering root system of a tree in Wirral Wood

Wirral Wood

The fields remained parched even though overnight rain had fallen, with their grasses bleached almost white and swaying in the slight breeze that brought comfort from the muggy heat higher on the hill.

Beyond the wood we joined a part of the Beacons Way, which is a 159km (99 mile) distance walk established in 2005 by John Sansom.  The path contoured and then gained height past a myriad of coloured butterflies flitting this way and that as high fern coloured the hill sides green.

Mark on the path leading toward the ridge

The path brought us to the upper ridge where the breeze rejuvenated me as the close conditions were slowly taking their toll.  From here it was only a short walk to the critical bwlch of Hatterrall Hill which is positioned close to the ridge path.

The ridge path leading toward the bwlch

As the Trimble gathered its allotted data Mark lay in the sun having lunch whilst I scribbled all necessary detail relating to the survey, once five minutes of data were collected and stored I joined him for a few minutes relaxing in the sun and welcome breeze.

Gathering data at the critical bwlch of Hatterrall Hill

The ridge path was a delight to walk on as it was bone dry and gave relatively quick access toward the summit of Hatterrall Hill where LIDAR analysis places the high point approximately 8 metres from the cairn, and another five minute data set was gathered from here.

Gathering data at the summit of Hatterrall Hill

All that remained was to reverse our inward route and head down back to the priory and awaiting car, when we arrived the shop at the priory had unfortunately closed so the ice cream we were dreaming of would have to wait, but a ginger beer and bag of peanuts in the Half Moon Inn seemed to do the trick before continuing the drive north to the car park near the top of the Gospel Pass. 

Downward toward Dyffryn Ewyas
   
  
Survey Result:


Hatterrall Hill

Summit Height:  530.8m (converted to OSGM15)

Summit Grid Reference:  SO 30831 25648

Bwlch Height:  486.5m (converted to OSGM15)

Bwlch Grid Reference:  SO 30674 26648

Drop:  44.3m

Dominance:  8.35%








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