The Hot Well spring, Bristol
From rags to riches and back again -
the story of the Hotwells spa
From rags to riches and back again -
the story of the Hotwells spa
INTRODUCTION
The King’s Spring in Bath has been exploited
by humans since 836BC, most famously by the Romans who built the first baths,
and then later during the spa age of the 18th century. Less renowned
is the eponymous spring of Hotwells in Bristol. At its peak in the Georgian
era, the “Hot Well” served a fully functioning pump room and hot baths, and
provided the catalyst for much of the development in Clifton. Today, the spring
has diminished in flow and is only visible at low tide as a trickle emanating
from the banks of the River Avon.
The modern-day resurgence of the Hot Well from the banks of the Avon as visible at low tide. All photo credits: Charly Stamper |
HISTORICAL
BACKGROUND
The spring was first mentioned in 15th
century historical records, and by the 1630s it was being regularly visited by
society. The thermal water emerged on both sides of the Avon, roughly opposite
the intersection the The Portway and Bridge Valley Road. It was contemporarily
described as being "milky white" and was thought to have restorative properties,
particularly for "hot livers, feeble brains and red pimply faces". During the
17th century the spring was relatively inaccessible, for there was no
formal path and a descent from Clifton involved “200 slippery steps”.
As the popularity of spas increased in the
Georgian era, so did the number of visitors to Lower Clifton. Initially, development
focused on the area adjacent to the natural resurgence, with the building of a
spa (old Hotwell House), entertainment complexes (Jacob Wells theatre) and genteel housing (eg. Dowry Square). In the 18th
century the spring’s reputed curing powers extended to venereal disease,
tuberculosis and cancer.
The main dent in the Hot Well's popularity remained
the distance and difficulty of access down the steep sides of the Avon Gorge, and in the mid 1780s Thomas Morgan embarked on an ambitious engineering project
to bring the waters to the heart of Clifton. From Sion Row he drilled a shaft some
250ft through the Carboniferous limestone to tap the hot waters, supplying
water to a new pump room with hot baths and a reading room, later to become
the St Vincent Rocks Hotel (now Avon Gorge Hotel). By 1793, this diversion had
become known as the “New Hot Well”.
In the following years, both springs began
to cool, almost certainly as result of increased groundwater mixing. This
coincided with a nationwide decline in spa popularity in favour of sea bathing,
increase in subscription charges and end of the Napoleonic Wars, meaning
British people were free to travel abroad. Several revival attempts in the 19th
century failed to capture former glories, and the spring is no longer
commercially exploited.
The Colonnade, Hotwells Road. Originally a shopping arcade, it was built in 1786 as an attempt at reviving the failing fortunes of the Hot Wells spa. |
GEOCHEMISTRY
AND HYDROGEOLOGY
Modern day studies of the hot springs of
the Avon area have tried to shed some light on the source and science behind
their existence. In 1993, the yield of the Hot Well was measured at 0.41 x 10^6
litres a day, about a third of the present-day flow recorded at the
King’s Spring in Bath and enough to fill an Olympic-sized swimming pool in a
week. Compositionally, the two springs are very similar, being rich in calcium
and sulphates, though 25% of the Hot Well volume is cold groundwater,
reflected in the relatively low average temperature of 24ºC.
The source of the two springs is thought to
be rainfall in the Mendip Hills, some 15km to the south-west. Measured carbon isotopes (∂13C)
are consistent with storage in Carboniferous Limestone, and hydrogen and oxygen
isotopes provide evidence that most of the water is meteoric in origin. The head
at this elevated topography is high enough to force the water down beneath the
Coal Measures to a depth of around 2.7km in the Bristol-Bath basin and heat
the groundwater; silica geothermometers indicate the thermal component of the
springs reaches a maximum temperature of 72ºC.
Cross section showing flow of groundwater through Carboniferous Limestone from source in the Mendip Hills to resurgence in Bath and Hotwells (Andrews et al., 1982). |
THE
FUTURE
Although the Hot Well spring has had its heyday, the King’s Spring at Bath remains at the heart of the city’s tourist trade.
In 2011, two companies (Eden Energy and UK Methane Ltd) were given licenses by
Mendip district council to begin a feasibility study for the controversial
practice known as “fracking”. Concerns were immediately raised by councilors in Bath and led to a subsequent
uproar in the local (and further afield) media. A specially commissioned
British Geological Survey report concluded that the risk to the Bath springs
was no higher than any other part of the UK, although critics point out that
relatively little is still known about the subterranean flow of the groundwater. The energy companies are a long way off
obtaining the planning permission needed to begin exploratory drilling, but the
authorities would to well to bear in mind the role that human intervention had
in the decline of the Hot Well spring.
Charly Stamper
Charly Stamper
REFERENCES
AND FURTHER READING
Andrews JN, Burgess WG, Edmunds WM, Kay RLF
& Lee DJ (1982) The thermal springs of Bath. Nature 298: 339-343.
Atkinson TC & Davison RM (2002) Is the
water still hot? Sustainability and the thermal springs at Bath, England.
Geological Society, London, Special Publications, 193: 15-40.
Clifton and Hotwells Conservation Area Character Appraisal (2010) Bristol City Council http://www.bristol.gov.uk/sites/default/files/assets/documents/clifton-and-hotwells-character-appraisal.pdf
Gallois RW (2007) The formation of the hot
springs at Bath Spa, U.K. Geol. Mag. Vol. 144, 741-747
Jones, D (1992) History of Clifton. Phillimore.
Kellaway, GA (1993) The hot springs of
Bristol and Bath. Proceedings of the Ussher Society, 8, 83-88.
Smith NJP & Darling WG (2012) Potential
problems within the Bath and North East Somerset Council and surrounding area
with respect to hydrocarbon and other exploration and production. British
Geological Survey Commissioned Report CR/12/055, 26 pp.