Skip to main content

Eastern High School is a new centre for secondary and further education in Cardiff. Scheduled to open in January 2018, it accommodates 1200 school pupils and a further 320 college students.

SDS was required to effect the fast and efficient removal of surface water from the site and to ensure its safe dispersal to natural water receptors.


Eastern High is a new high school and further education centre, funded by Cardiff Council and the Welsh Government as part of the £164 million ‘21st Century Schools’ upgrade programme across Cardiff. It replaces the former Rumney High School which was demolished to make way for the new, much larger premises.

Eastern High’s aim is to create an inspiring educational environment that provides a smooth transition for high school leavers to continue in further, post-16 education and training on the same premises. It also supports the wider local community with a range of leisure and learning facilities.

SDS Case Studies Eastern High School


Works were carried out in an environmentally sensitive location with measures taken to protect the existing development from pollution and damage during both demolition and construction.

Consultation with Natural Resources Wales established that there should be no water pollution into the Severn Estuary and that the scheme should include provision for regular monitoring of water quality, including visual checks.

SDS Aqua-Filter™ has been installed as part of a complete water management programme, connected upstream to an Aqua-Swirl™ separator and downstream to a GEOlight® stormwater attenuation system. It provides a high level of water quality treatment through the use of the Aqua-Swirl™’s swirl chamber for pre-treatment, followed by a filtration chamber for secondary treatment.


This scheme was required to treat and remove suspended solids from surface water runoff during both the demolition and construction works.

The treatment flow rate of the Aqua-Filter™ system is engineered to meet or exceed the local water quality treatment criteria and form an intrinsic part of the SuDS solution train. The three SDS GEOlight® geocellular attenuation tanks have the combined capacity to store up to 1,950m3 of treated water.


SDS GEOlight® attenuation tanks


SDS Aqua-Filter™ and 1 SDS Aqua-Swirl™ treatment devices


million litres treated stormwater storage capacity

This project required stringent control of surface water quality given the sensitive nature of the receiving watercourse in a SSSI. This level of water quality treatment could not be achieved by standard proprietary installations. Following extensive investigation, we identified a solution that we were previously unaware of. Having found the answer we were looking for in SDS’s new hydrodynamic vortex separation and filtration system we are proud to have installed the UK’s very first Aqua-Filter™.

Ed Hoskins, Senior Associate, Cambria Consulting

Download the full case study here

SDS Aqua-Filter™

SDS Aqua-Filter™

SDS Aqua-Filter™ uses hydrodynamic and gravitational forces to remove gross pollutants from surface water runoff. It then filters out fine sediments, nutrients, heavy metals and hydrocarbons through percolation, adsorption, biological breakdown and ionic exchange, prior to final conveyance.

It is designed to work in an offline configuration to mitigate washout of the contained pollutants and should be installed in sequencer immediately following an SDS Aqua-Swirl™ unit.

It is able to deal with large volume surface water runoff, removing very fine silts and dissolved pollutants that are contained in the initial flush.


Discover how the SDS portfolio can benefit your development and get in touch now.