Creating liveable cities

SUD solutions – water purification and management of road runoff

Because of larger and ever more frequent precipitation events, many places in the world require local management of stormwater (Sustainable Urban Drainage or SUD). Aims include both the retention of stormwater to relieve the runoff system and also purification of the stormwater before it seeps into the groundwater or other water recipient. In the majority of cases, SUD solutions use planting which takes care of water infiltration while also benefitting from the extra inflow of water.

Avoid salt in systems in winter

During wintertime, roads are salted in many places. So every winter large quantities of saltwater flow into SUD systems, both damaging plants and running off into the groundwater. Milford’s KerbCell solution can block roadway runoff water in winter and lead it instead to the sewer system. While in summertime it can direct road runoff water for treatment and infiltration in the SUD system.

Need for treatment before infiltration

When rainwater flows across a surface, it picks up many of the particles and sediments that lie on the surface. These particles, especially those found on roads, can be highly polluting. In many cases, before water can infiltrate or be directed to a recipient, there is a need to treat the water so as not to release contaminated water into nature.

Rain garden system that cleans and filters

Many rain gardens are therefore constructed with filtering soil to filter the water and bind many of the particles. If the system does not have a sand trap fitted before the water reaches the plant bed, this can result in sludging, which means it is difficult to maintain its cleaning properties. Modular Wetlands is a modular rain garden system with a proven and substantial treatment effect. The system is easy to clean and maintain, and its filters can retain contaminants and heavy metals so that they are not released into the groundwater.

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