Problem
A surface water discharge limit was imposed on a new Shropshire Homes residential development at Ironbridge. During the design of the surface water drainage system, Shropshire Home engineers realised that storm water attenuation would be required.

Solution
Polypipe Civils Technical Department worked in conjunction with Shropshire Homes to supply a system that would integrate the storm water storage capacity required with the private drainage network.

Off-line storage tanks were fabricated to meet the specific site requirements, utilising the Ridgidrain push fit jointing system to facilitate fast and easy assembly on site. Supporting detailed drawings were provided by Polypipe Civils’ to assist the detailed and drafting of the drainage system.
The storage tanks utilised Ridgidrain 1050mm diameter pipes, sealed with polymer sheeting. This enabled Polypipe Civils fabrication department to attach couplers to the Ridgidrain system at the levels and orientation required.

Storage tanks installed on alternative sides of the main drainage run, using standard fittings. A ventilation pipe was also installed at the soffit of the storage tank system to prevent entrapment of air in the storage tanks and aid water flow in the drainage system.

Benefit to the client
The Ridgidrain ADS was adapted to meet the specific surface water drainage requirements, incorporating cost effective attenuation storage within a single system and thereby achieving rapid, easy assembly on site.

February 2003