and improved monitoring of chlorine levels. The output of the plant now meets the requirements of the DWSNZ. Further upgrade work is planned for the Speeds Road WTP to provide protozoal compliance with the DWSNZ. 1.5.4 Picton Reticulation Generally the cast iron mains are the oldest dating back 60-70 years. Cast iron continued to be used but was increasingly replaced with asbestos cement and this remained the prominent material throughout 1950s and 60s. PVC and polyethylene pipes started to be used in the 1970s and were the predominant pipe materials from 1990 onwards. Due to the terrain in Picton high system pressure is required to feed the properties on the upper hillsides. Properties on the valley floor receive high pressure. Plans are currently being considered to create pressure management zones around some of these areas. In 2010 a new 3,000 m reservoir was constructed at Victoria Domain to provide increased3 security of supply and support for the older Elevation Reservoir. The reservoir is fed through gravity from the Elevation or pumped through the Lincoln Street Booster Station. An additional three 30 m water tanks were added to Boons Reservoir site in 2011. Waikawa Reservoir at the3 northern end of the reticulation receives water when demand is low and feeds water back into the system at peak periods. A number of other small ‘energy harvesting’ reservoirs provide a similar facility to localised sub-divisions. A booster station at Lincoln Street pumps water to higher properties in the area and fills the ‘energy harvesting’ reservoirs. 1.5.5 Renwick Supply and Reticulation The public water supply to Renwick was first established in 1975. Water was abstracted from a well in Terrace Road and pumped to a storage reservoir at an elevated site close to Boyce Street. After basic treatment the water was pumped into supply. Since then two further bores have been installed and a tank farm of 10 storage tanks added to the Boyce Street site. The water is aerated through a trickle aerator on the way to the tanks. The water is disinfected with chlorine before being pumped to the town. The water does not meet the protozoal requirements of the DWSNZ. Flow and pressure are monitored at the treatment/pump station and the two distribution pumps are automatically started and stopped to meet demand fluctuations. Around half of the reticulation is asbestos cement pipe the remainder split evenly between polyethylene and PVC. 1.5.6 Havelock Supply and Reticulation The Havelock water supply scheme has evolved over a number of years. A small impounding dam on a creek above Takorika Street to the west of the town was constructed pre-1950 and created a small reservoir of 300 m³. The reticulation consisted of 3” and 5” cast iron pipes that served the area of the settlement north of Lawrence Street. The system was expanded to include the southern part of town in 1977 and 150 mm and 100 mm dia AC pipes were installed. In 1993 a bore was sunk to the south of the settlement adjacent to the Kaituna River and storage was improved by the addition of 5 x 45 m³ storage tanks sited close to the Takorika dam. In 1996 a new 150 mm diameter PVC main was laid from Lawrence Street north to increase the firefighting capacity. Today a second bore has been drilled adjacent to the first to provide additional security of supply. Chlorine is added to the delivery main at the wellhead by a dosing pump. Water is pumped to a new steel service reservoir, built in 2010, and the old ferro-concrete tanks have been demolished except for one which has been retained as an emergency back-up until a second steel reservoir is constructed in 2018/19. The Kaituna well pumps are activated automatically based on the level of water in the reservoir. The settings are adjustable remotely Page 9