Planning granted for residential development on former gasworks

A former Bristol gas works site which has been derelict for more than 40 years is set to be redeveloped after planning consent was granted for a 58 unit residential scheme.

Brandon Yard on Bristol's harbourside contains ruins of two grade-II listed buildings, West Purifier House and Engine House. Both will be restored under the plans, together with the iconic chimney of Engine House.

Clarkebond has provided a range of pre-planning services including flood risk assessment, drainage strategy, ground engineering and remediation strategy, for the project.

The site is located within an area of high tidal flood risk, which is a problem for a large area of central Bristol. The assessment of suitable flood mitigation required a unique approach as the external fabric of the listed buildings could not be altered, and so early consultation with the Environment Agency was necessary to agree the design parameters.

It was agreed that protection up to the design flood level would be provided by demountable barriers and flood proofing of the building exterior; the specification of resilience measures on the ground floor was an additional level of protection. A robust flood evacuation plan and management plan was also produced for implementation at the site. 

The final proposal incorporated SUDS measures including lined permeable paving in the external vehicle access and swales for the maximum capture of hydrocarbons prior to discharge into the Floating Harbour.

The drainage strategy positioned the outfall below the normal harbour water level to reduce hydraulic impacts.  In order to avoid this surcharging the surface water system, the final lengths of the surface water system are back dropped with flap valves and penstocks to allow the system to be isolated from the harbour and to ensure that harbour water does not back up into the onsite storm sewers.

On site flood levels are predicted to be 9.8m hence all habitable buildings are set above this.

The site presented a number of challenges as a result of legacy contamination issues relating to its historic use for both gas works and glassworks.  Clarkebond assessed available data, carried out site investigations and provided a report and recommendations regarding the contamination issues.

Clarkebond also undertook a Coal Mining Risk Assessment and then produced a final remediation strategy.

Architect: AWW
Planning Consultant: GVA
Client: Square Bay/Acorn Property
Engineers: Clarkebond