Knowledge Centre

For architects and housing developers, understanding Standard Four of the National SuDS Standards is essential for delivering compliant, sustainable, and marketable projects. This standard is all about water quality and ensuring that runoff from your developments is treated effectively before leaving the site. Why Water Treatment Matters for Your Projects Modern developments face increasing scrutiny…

When it comes to sustainable drainage systems (SuDS), many sites present unique challenges that demand more than standard solutions. While the basics such as permeable paving, soakaways, and swales are essential for managing runoff and improving water quality, complex sites often require a more advanced approach. Here, we explore some cutting-edge SuDS features that can…

Maintenance is no longer the “nice to have” part of drainage and SuDS design. Under newer expectations and standards, long term performance is treated as a core design outcome, not an afterthought. If you are an architect, developer, or homeowner planning a project, the message is simple: if you cannot show how the system will…

If the past couple of weeks have shown anything, it is that the South of England can swing quickly from worrying about surface water and flooding to worrying about water shortages. In Kent and Sussex alone, a major incident was declared as tens of thousands of properties were left without a proper water supply for…

Green roofs, sometimes called living roofs, are more than a nice architectural feature. Done properly, they can become a practical part of your surface water strategy. They help slow down runoff, reduce pressure on drains, and support planning approval where SuDS is expected. This article explains what green roofs do, where they fit in a…

We know that architects and housing developers are under pressure to deliver sites that work on paper and on the ground. Planning conditions are tighter, rainfall patterns are less predictable, and space is always at a premium.  A systems approach to SuDS avoids that. Instead of relying on one feature to do everything, you combine…

f you are an architect or housing developer, you do not need another policy document to read. You need to know what the National SuDS Standards mean in practice, what planners will ask for, and how to avoid the slow, expensive back and forth that can derail a programme. In simple terms, the National SuDS…

Most delays are not caused by complex hydraulics. They are caused by uncertainty. The planner or drainage officer cannot clearly see that the design is appropriate for the site, so they ask questions. Each question creates another round of drawings, notes, and approvals. The most common root cause is a drainage strategy that does not…

The National SuDS Standards promote a clear order of preference for where surface water should go. This is often called the runoff destination hierarchy. It matters because it forces the design team to consider better outcomes first, rather than defaulting to the easiest connection. Option one is to use the water on site, for example…

Infiltration is often treated as the default answer, but it is only a good answer when the ground conditions support it. When it is forced onto a site without evidence, it becomes a planning risk and a construction risk. Infiltration works well when soils can accept water at a reliable rate, groundwater levels are suitable,…