What type of SuDs works for you?

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Icosa Water owns and operates on a wide range of SuDS.  We’ve been doing so since we were first established in 2016.


A pond can be provided either as a natural depression in the ground or constructed by excavation and lined as necessary. It can contain a permanent level of water but usually has capacity for exceedance flows above the permanent water line.

Detention & Infiltration Basin

A detention or infiltration basin will have much the same characteristics as a pond but without the permanent water level during periods of dry weather. The design of the basin is to accept flows during very wet weather and to store it until the flows in the receiving sewer have subsided, where it will then be returned at a controlled rate. In the instances of infiltration, the surrounding ground can effectively receive all the excess flow volume.



A wetland area has similar functions as a pond. However, it is usually shallower, longer, and narrower. They are almost entirely covered in marsh vegetation and can provide a key part of any SuDS solution by storing excess water and improving water quality.


Swales are usually shallow linear storage ponds that tend to run alongside the highway. They receive exceedance flows from surface water drainage and store it until it can be returned — the same way detention basins and infiltration ponds work. Alternatively, Icosa would consider the use of perforated drains below the bottom level of the swale subject to a granular surround and geo-textile membrane being installed.

Filter Strips

Filter strips are usually areas of grass that receive surface water run-off directly from an impermeable area without the need for gullies and pipes. The strip is then used to filter out silts and debris protecting the downstream network.

Cellular Storage

Cellular storage comes in many shapes and sizes, and some have greater maintenance risks and liability than others. Icosa are happy to consider any type of geo-cellular storage that a developer wishes to promote. However, there are inherent risks with some products, so Icosa requires installations to meet certain standards.


If you would like to learn more about it, why not create an account for the Icosa Water Portal . Where you can access a copy of the Icosa Water’s SuDS design guide.