n Civil Engineering = Siviele Ingenieurswese - An early performance analysis of a bio-swale and litter-silt-traps as components of sustainable drainage systems : environmental engineering
|Article Title||An early performance analysis of a bio-swale and litter-silt-traps as components of sustainable drainage systems : environmental engineering|
|© Publisher:||South African Institution Of Civil Engineering (SAICE)|
|Journal||Civil Engineering = Siviele Ingenieurswese|
|Author||Michael Vice, Richard Emery and Colin Hall|
|Publication Date||Aug 2013|
|Pages||25 - 34|
During the construction of the Kraaifontein (Integrated) Waste Management Facility (KWMF) in Cape Town, alternative stormwater management options, which included litter-silt-traps and a bio-swale, were implemented. Stormwater runoff from the site is collected in several litter-silt-traps and discharged into the bio-swale, which is located at the lowest corner of the site. Polished stormwater subsequently discharges into an existing retention pond downstream of the site. The bio-swale is categorised as a 'local control' Sustainable Drainage Systems (SuDS) option, and is the amalgamation of selected properties of two local control SuDS options, namely bio-retention areas and swales. As a result of the unique waste operations onsite the quality of stormwater that is discharged into the bio-swale is highly contaminated, in some instances replicating landfill leachate at over 17 000 mg COD/ℓ. Stormwater samples were taken at four six-monthly intervals at the beginning and end of the Cape's wet and dry seasons. The results clearly demonstrate the efficacy of these SuDS options in reducing, inter alia, heavy metals, suspended solids, total phosphorous and COD, with over 80% removal efficiencies. These results have exceeded the treatment requirements stipulated in the City's latest stormwater management policy.
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