Steep Sustainability for Welsh Park

Sustainable commercial development has received a boost in North Wales with the installation of Hydro International’s Stormcell® and Hydro-Brake® Flow Control stormwater control systems on one of the biggest business development projects for many years.

Parc Bryn Cegin is a major new business park on the outskirts of Bangor, Gwynedd targeted to bring more than 1,600 jobs to North Wales.  The steeply sloping 36 hectare site is on a bluff above the Afon (river) Cegin between the A5 and A55, with a fall of over 45 metres, so the development was arranged on a series of 9 plateaux connected by an access spine road.

As Nicola Wilkes, Senior Project Engineer for Consulting Engineers Jacobs points out: “The steep slope, underlying rock formations together with the new development mean that stormwater runoff in this high rainfall area could potentially be a problem by increasing the runoff into the river.  The Stormcell® and Hydro-Brake® Flow Controls mitigate the effect of this increase and fulfil the SUDS (Sustainable Drainage Systems) principles for this project.

“The Environment Agency limited the discharge rate to 5 litres per second per hectare into the river.  We designed a 1750 m3 stormwater control system based on three Stormcell® storage tanks at points down the slope, attenuated with Hydro-Brake® Flow Controls in the storm drainage which runs along the central roadway.  In this way, the site can be treated as three separate but interlinked catchment areas.

“The Stormcell® modular block storage tanks were chosen as it is one of the systems Dwr Cymru Welsh Water will adopt.  The load bearing modules enable tanks to be constructed in a variety of shapes to suit the topography without extensive civil works, a distinct advantage where the soil cover over the rock base is thin and slopes are steep; a low maintenance feature is the patented perforated pipe design for integral silt protection to the storage, minimising any maintenance requirements.”

Read the full Park Bryn Cegin case study

Learn more about Hydro Stormcell®

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