by Council’s operators via Datran Supervisory Control and Data Acquisition system (SCADA). The bore pumps will also be started when a preset outflow rate from the reservoir is exceeded. This is a precaution in case of a fire. The dam in the Takorika catchment has been isolated from supply and decommissioned because of the risk to health from protozoa contamination of the water. The Havelock distribution system is relatively young. The original cast iron main in Main Street and Lawrence Street was identified as the source of discoloration problems (it was badly tuberculated) and a likely source of leakage and flow restriction. It was replaced in 2009. Two thirds of the mains are constructed of modern plastic material - PVC or polyethylene. 1.5.7 Awatere Supply and Reticulation The original Awatere water suppysceme was designed around 1938 and was installed and operational by 1942. The Awatere water scheme was initiated as both stock and domestic supply. The initial scheme involved installation of 32 kilometres of pipeline to serve an area of 10,000 ha although it was envisaged that eventually the scheme could serve an area of up to 20,000 ha. The scheme took water from the Black Birch Stream, piped it along the north bank of the Awatere River to just downstream of Blairich Station where the pipeline crosses the Awatere River and continues down the south bank to service the Seddon township and beyond to Seaview and the coastal properties some 8 kilometres from Seddon. A number of extensions serving the Tetley Brook, Blind River, Grassmere and Upton Downs were installed in the late 1950s and early 1960s. Later the Dashwood scheme was constructed in 1967/68 to service a further 30 properties with a total area of some 5,300 hectares. In some areas privately installed pipelines have been vested in Council who now maintains them. Areas include Marfells Beach Road and Waterfalls Road. Today the Awatere water supply scheme services an area in excess of 30,000 hectares through 154 kilometres of pipeline with approximately 750 connections. The pipe layout displays characteristics of a rural water scheme. There is a small inter-connected network of mains around Seddon town and long lengths of main radiating out to service rural properties. Around half of the total length of the reticulation is asbestos cement pipe and a further 30% is steel (concrete lined or galvanised). The expansive nature of the reticulation and the hilly terrain of the Awatere Valley require booster pumps to distribute the water combined with pressure reducing valves to deliver it at a practical pressure to the consumer. There are three pumping stations in the system at the Blairich Rise, Upton Downs and Denton’s Pit. Storage tanks are located at Upton Downs, Dentons Pit, Lions Back, Blind River and Wheeler’s Hill. An ultra-violet water treatment plant is located at Seddon School to supply treated water to the school and a tap is available for the public to draw ‘treated water’. In 2012 a MIOX water treatment plant was installed and commissioned at Blarich at a point close to where the Dashwood reticulation separates from the remainder of the system. MIOX is a patented system that generates sodium hypochlorite and other oxidants from a concentrated brine solution. The hypochlorite is injected into both the Dashwood and Blarich trunk mains. The plant does not meet the requirements of the DWSNZ for protozoa but has been installed as an affordable process to treat bacteria and viruses when the turbidity is low. During and following significant storm events the turbidity increases and the chlorine generated by the MIOX system becomes ineffective. Filtration is required to reduce the turbidity and remove protozoa.. Page 10