Council has developed and is implementing strategies to improve water quality in the South Ayr, Brandon and Rossiters Hill areas.
Over the past two wet seasons, water quality in South Ayr, Brandon and the Rossiters Hill areas has deteriorated due to:
- increased concentrations of iron and manganese in the untreated bore water at South Ayr;
- increased accumulation of iron and manganese in the pipe distribution network; and
- variable flows in the distribution network, resulting in an increased dislodgement of iron and manganese from the distribution network.
The source water that is extracted from the borefield at South Ayr is perfectly clear when it reaches the surface and only becomes discoloured when dissolved iron and manganese present in the water oxidises when coming into contact with oxygen. Discolouration is increased when the water is treated with chlorine to remove any harmful bacteria prior to consumption.
Council recognises that incidences of discoloured water in South Ayr, Brandon and Rossiters Hill are unacceptable so, in addition to the reactive process of flushing mains where discoloured water occurs, Council has instigated a number of actions to improve water quality, including:
- ongoing air scouring of distribution mains prioritising South Ayr, Rossiters Hill and Brandon areas,
- planned installation of scour injection points on the 500mm trunk main between South Ayr Water Treatment Plant and Blacks Bridge to allow regular scouring,
- planned installation of scour injection points on the 375mm trunk main in Railway Street between Burke Street and Macmillan Street to allow regular scouring,
- air scouring of the 300mm trunk main in Burke Street from Railway Street to Edwards Street – scheduled August 2013,
- bi-annual scouring of the 300mm trunk main between Ayr and Brandon – scheduled during school holidays at Easter and September,
- installation of a baffle system at the South Ayr Treatment Plant reservoir to increase precipitatation of iron and manganese from the bore water prior to entering distribution network – COMPLETED
- planned installation of variable speed drive pump motors at South Ayr Treatment Plant to achieve uniform pressures and positive flows throughout the system.