Dean Clough contains a group of large factory buildings built in the 1840s–60s which became one of the largest textile factories in the country. The Grade II listed Mill Buildings have been converted to house about 150 large and small businesses and arts venues including; Crossley Gallery, several other art galleries and the Viaduct Theatre. It is now seen as a leading example of successful urban regeneration.

The culvert is located on the north side of Halifax and is approximately 600 metres long, as it traverses under Dean Clough. It is located underneath the Old Mill, a main road and a large office / hotel complex.

Entry to the culvert is difficult due to the limited access points, which meant a lengthy confined space traverse would be necessary. The culvert is of mixed construction including the main masonry arch along with newer concrete sections and slabs with steel beams.

Due to the periods of prolonged wet weather, the culvert has needed to accept a far greater volume of flow than normal. Over a number of years a significant volume of both natural and man-made debris has accumulated within the culvert restricting flows which causes the water to back up and increases the risk of localised flooding.

PMP were contracted to enter the culvert, classed as a high risk confined space, to provide suitable and sufficient site based rescue cover. They were to locate and remove debris from within a 200 metre stretch of the culvert and inspect for any damage caused by the debris.

A seven man team was required, consisting of a top man; two rescue trained men and four operatives. After entering the culvert the team cleared and removed a significant amount of vegetation along with industrial and general waste, releasing further capacity within the culvert to accommodate higher flows during periods of prolonged wet weather.

The team worked at an agreed day rate over a four week period when weather conditions and the level of water within the culvert allowed. As there was always a live flow of water and the levels within the culvert varied, our ability to carry out a safe entry was checked daily, as it was dependent on the weather conditions at the time and volume of flow within the culvert.

On site welfare facilities were provided and PMP were responsible for the removal and appropriate disposal of the debris from the culvert.

On completion of the project, photographic evidence was provided to JBA Bentley to enable them to make decisions on any additional work including potential repairs of localised damage.