Perth's major flood prevention scheme opened at the end of October after nearly four years of construction.
Perth, on the banks of the River Tay in Scotland, has historically been subject to regular flooding. The most recent event in 1993 caused over £26M worth of damage.
Consultant Babtie was responsible for the design of the £25M flood scheme, which consists of 8. 8km of landscaped earth embankments and stone-faced reinforced concrete walls stretching from north to south Perth.
Floodgates have also been built at appropriate points along the river. Several underground pumping stations minimise the risk of localised flooding by ensuring that surface water drainage systems can discharge into the Tay. Storage ponds have also been built on local rivers and streams.
Construction work was carried out by Balfour Beatty, Morrison Construction, RJ McLeod and MJ Gleeson. The project team had to overcome several technical challenges during the work, including difficult ground conditions, the close proximity of existing walls and structures and confined working space.
Conservation issues included archaeological excavations in advance of the works, providing roosts for a rare species of bat and avoiding sensitive wildlife habitats. The team returned Craigie Burn, which runs through Perth, to a more natural state, including planting native wild flower species along its banks. Scheme design also considered the potential impact of climate change on river flows and tide levels.