Sustainable Urban Drainage Systems (SUDS)

Most new developments will result in an increase in impermeable area in comparison to it’s predevelopment state. Historically, surface water runoff would have been collected by a positive drainage system and transported to the nearest available sewer or watercourse. The consequent flow rate and volume of runoff would be substantially greater and arrive at the point of discharge more quickly than previously, leading to downstream flooding.

We are expert in the design using current best practice which considers the requirements of the Environment Agency, Natural Resources Wales and Building Regulations in order to deliver a more sustainable approach to surface water disposal. This is achieved through the SUDs hierarchy which places drainage solutions in order of sustainability as follows:

• Infiltration systems and soakaways

• Discharge to watercourse

• Discharge to sewers

Infiltration most closely emulates the natural ground percolation and greenfield runoff and if soil characteristics allow can be achieved in a variety of ways, using traditional ring or granular soakaways, swales, cellular crate systems or porous paving.

Discharge to the watercourse or sewer will often require a means of reducing peak flow rates to predevelopment values by storage and attenuation. The optimum cost solution to achieve the required storage volume would be selected from a range of solutions such as oversized pipes, cellular crates, ponds, basins and tanked sub base material.

 We are expert in the design of the widest range of SUDS solutions and utilise the latest surface water drainage and rainwater catchment modelling software. We routinely design and detail all types of SUDS techniques to use the most appropriate and innovative installation.


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