A wide-variety of SuDS components have been included for the 31,000 m2 first phase of the development to meet the level of treatment required by the Scottish Environmental Protection Agency (SEPA) to help protect the water quality of the River Dee, a well-known salmon river.
To meet stringent planning requirements, consultants Mott MacDonald selected Hydro International's unique Up-Flo™ filtration units and Hydro BioCell™ biofiltration units for key parts of the site.
"SEPA required two levels of pollution control in the drainage treatment train for some areas of the site," explains project engineer Nick Watson of Mott MacDonald.
"The six Hydro BioCell™ units are installed in a landscaped courtyard garden around three linked four-storey commercial blocks. There is also a two-storey 1,197 space car park and runoff from its draining surface is treated via four Up-Flo™ Filters in concrete manholes.
"Space constraints meant that finding small footprint solutions that could achieve high treatment levels was limited. There are some occasions where the more natural engineering approach is less suitable due to a lack of space and having an option like Up-Flo™ can be useful," continues Nick Watson.