Aqueduct on Dowlais Free Drainage System is a Grade II listed building in the Merthyr Tydfil local planning authority area, Wales. First listed on 11 March 2003. Aqueduct.
Aqueduct on Dowlais Free Drainage System
- WRENN ID
- old-tallow-snow
- Grade
- II
- Local Planning Authority
- Merthyr Tydfil
- Constituency
- Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
- Country
- Wales
- Date first listed
- 11 March 2003
- Type
- Aqueduct
- Address
- Aqueduct on Dowlais Free Drainage System, Pengarnddu, Pant
- OS grid reference
- SO 074 083
- Coordinates
- 51.76642, -3.34271
- Source
- Cadw listing
Description
The aqueduct on the Dowlais Free Drainage System is a structure made of grey stone, featuring a segmental arch that stands approximately 2.4 meters high and spans 1.4 meters. The arch is constructed with stone voussoirs. It has angled wing-walls and buttresses, also made of stone, with the soffit finished in red brick. The parapets have been repaired with cement. The watercourse beneath the aqueduct is about 1 meter wide and lined with brick. There is a tunnel that is approximately 4 meters long, with the northern side partially buried under overburden since 1979.
Local climate
Aqueduct on Dowlais Free Drainage System sits in one of the wettest parts of the UK, with an average of 1,200 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 80% of listed buildings.
It experiences an average of 54 freeze-thaw cycles a year, more than 95% of listed buildings. Of these, 30 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
More on this building
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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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- 5 Aqueduct between Bridges No. 78 and 79 Monmouthshire and Brecon Canal
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