Twrch Brook culvert and overflow sluice on the Neath Canal is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 12 December 2003. Culvert.

Twrch Brook culvert and overflow sluice on the Neath Canal

WRENN ID
dim-ledge-moon
Grade
II
Local Planning Authority
Neath Port Talbot
Constituency
Neath and Swansea East MP: Carolyn Harris (Lab)
Country
Wales
Date first listed
12 December 2003
Type
Culvert
Address
Twrch Brook culvert and overflow sluice on the Neath Canal, Clyne, Clyne and Melincourt
OS grid reference
SN 798 003
Coordinates
51.68927, -3.73895
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Twrch Brook culvert and overflow sluice on the Neath Canal is a low tunnel constructed from rubble stone, featuring a segmental arch and a sluice opening downstream beneath a high rubble stone embankment wall. The arch is made of thin stone voussoirs, some of which are now eroded. Above the arch, there is a square sluice outlet with a large stone lintel. The walling consists of squared stone laid in courses and does not have a parapet. On the canal side, there is a sluice control mechanism with a wooden frame and a metal gate. The upstream side, located on the east side of the road, is much lower and includes a small segmental arch, a 20th-century low wall, and white painted railings.

Local climate

Twrch Brook culvert and overflow sluice on the Neath Canal sits in one of the wettest parts of the UK, with an average of 1,340 mm of rain a year. This makes it wetter than 96% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.

It experiences an average of 33 freeze-thaw cycles a year, fewer than 53% of listed buildings. Of these, 15 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.

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