The purpose of the project was to reduce the frequency of storm overflows to the nearby River Douglas in line with EU Bathing Water Legislation. The project was instigated by United Utilities to increase storm storage capacity from 45,000m3 to 110,000m3 via the construction of three new 133m x 62m x 4m tanks with a combined storage capacity of 65,000m3.
The design for the large tanks revolved around resistance to flotation. The design water level at
The storm tanks were reinforced with special mesh prefabricated into U-shaped cages that slot together on site with nominal lacer bars. The base slab design had to consider thermal movement and shrinkage and involved the adoption of 30m x 30m pours to reduce the number of joints and associated detailing problems.
Located in the