The bespoke flood defence project involved protecting the switch house building and the outdoor switchgear on the primary substation site. The design of the flood defences had to guard against a predicted 1 in 100 year flood event of 1.6m above the switch house floor level. The work involved excavating, by hand, to foundation level; sealing letterbox cable entries and ducts using CSD RISE products (for which we are approved installers) and external tanking using the Bituthene 8000 system with a protective skin in facing brickwork, capped with plinth stretcher special bricks. Extreme care was necessary, as some highly sensitive lead-cored cables exited the switch house - which aslo contained a live open fuse board.
Bund walling with integral tanking and floodgates was installed, together with some deep drainage within the external access road. A bespoke non-return valve was specifically sourced by Grant Construction. This was remedially fitted to a 450mm diameter deep storm water drain, expelling to the nearby watercourse.
All substation equipment remained live during the project. Despite the obvious dangers, all necessary work was completed without incident.