Rain Activ Case Study – Park Lane, West Midlands

West Midlands landowner had the desire to build a 5 bedroom property on clay ground conditions which made a soakaway unviable. Connecting straight into the existing combined sewer was unacceptable. The project required an alternative attenuation solution to restrict the flow rate.

Client: Homeowner

Project Size: 5 Bedroom home

Type of System: Rain Activ Attenuation System with controlled discharge

Location: West Midlands

Completed: 2023

With increasing flood risks, authorities are paying more attention to the drainage strategy of new build homes.

Due to the clay ground conditions, a soakaway couldn’t be considered as an effective drainage strategy for this project, therefore, permission to connect to the existing storm & waste water network was required. However, this was denied due to capacity.

We were appointed by the client to design and build an effective drainage strategy that would satisfy local authorities.

Typically, the local authority will provide a desired discharge rate, however this was not the case for Park Road. We developed a strategy using site specific details and common requirements to present a system that provided 3300 liters of attenuation, discharging at 2.0lps through a 28mm orifice to cope with the 1:100yr storm and account for 40% climate change.

Unfortunately, this solution was rejected by local authorities as they required a lower discharge rate. After further clarification from the local authorities, we were able to ascertain in more detail the required design parameters.

Working with the client, we were able to redesign the drainage strategy to 4900 liters of attenuation, discharging at 0.9lps through a 18mm orifice to cope with the 1:100yr storm with 40% climate change.

Finally, the strategy was accepted and the client proceeded with their build. The build is now well and truly underway, and stands as an example of how RainActiv is an effective solution for storm water management.

• Fully compliant with local authorities.
• Climate change resilience.
• Effective storm water management.
• Enhanced attenuation capacity.