Sustainable urban drainage (SuDS), stormwater and combined sewer overflows

Intense rainfall tests networks designed for a different climate, and the problem always shows up on the same street. We model the network, quantify the overflows and size solutions that fit within the public realm.

What's included

• Modelling of the stormwater and combined sewer network with updated rainfall series.
• Analysis of combined sewer overflows and their pollutant load.
• Assessment of urban flooding hotspots and of insufficient capacity.
• Sizing of SuDS, attenuation and storage tanks, with maintenance criteria.
• Integration with planning, the public realm and urban green space.
• Prioritised programme of works and investment estimate.

When you need it

• Certain streets flood repeatedly and the solution has to be justified.
• You are required to reduce combined sewer overflows.
• A new development has to demonstrate it does not worsen the existing network.
• You want to build sustainable drainage into a street refurbishment already planned.

How we work

We model the network as it really is, including what is not on the drawings, because that is usually where the bottlenecks are. And we size with an eye on whoever will have to maintain the SuDS in ten years' time.