Whitehall Distribution Service Reservoir (DSR)
Whitehall DSR is located on Stronsay, one of the north isles in Orkney. 25 miles to the north of the Orkney mainland, the isle is home to 350 residents and is accessible by public ferry and plane. The Stronsay WTW that feeds the DSR is 300m to the South of the tank location. The WTW had a new TTU installed in 2021, giving a cutting edge membrane solution to mitigate cryptosporidium failures in the local network. The new DSR replaces a 75 year-old concrete structure that had potential water quality failure zones highlighted in the project intervention report. The existing works serve the residents of Stronsay with gravity and pump fed supplies out of the 300m3 storage facility at Whitehall.
Design for Manufacturing and Assembly (DFMA) and Collaborative Design
The strategy from the outset of the project was to maximise the use of DFMA and the use of the available digital delivery tools, with the primary aims being:
Reduced Programme:
CWT construction to be completed in factory environment, reducing the amount of person hours on-site while also enabling fabrication to be conducted concurrently with civil construction.
Improved quality:
Stringent quality control in fabrication facilities.
Reduced HSE Risk:
Due to the factory construction of the CWTs, a significant portion of the construction is completed in a controlled factory environment, rather than on site.