Blenheim Estimated winter night storage 19 hours. UV and pH correction treatment. Picton Estimated winter night storage 23 hours. Essons Valley – filtratio,cori ation and UV treated. Speeds Road – chlorination and pH correction. Treatment is required for health protection. Essons Valley has summer algae problems requiring aeration. Havelock Estimated winter night storage 12 hours. Takorika – open catchment – could be used in an emergency. Boiling or treating water essential. Renwick Estimated winter night storage 8 hours. Chlorinated. Treatment is required for health protection. Awatere No system storage at present but future plans are for a reservoir to service Seddon. Many properties have on site tank storage. No system treatment – boil water notice in place. Treatment is essential for health protection. Wairau Valley No storage. Chlorination which is essential for health protection. Riverlands/Cloudy Bay Business Park 24 hours storage (winter night). No treatment. Secure supply so treatment not required unless an event makes supply insecure. Wastewater Council operates urban sewage collection, treatment and disposal system to protect both the health of the community and the physical environment. The network is over 305 kms in length. The flow in the wastewater reticulation relies largely on gravity through a continuous progression of pipes. There is very little opportunity to interconnect branches of the network. A breakage or blockage in the system will therefore affect all pipes upstream. Mobile pumps can be deployed to ‘over-pump’ across a blockage but there are only limited numbers of pumps of sufficient capacity available in the region. The Canterbury earthquakes of September 2010 has shown that all types of spigot and socket jointed pipes can be dislocated during severe ground shaking. Pipes, wet wells and manholes are all susceptible to ‘floating’ in areas of liquefaction. Relative ground movements during an earthquake can also disturb the gradient required for gravity flow. Other hazard events such as power outage have also been taken into consideration. The main sewage pump stations at Blenheim MOPS, Dublin Street Picton and Waikawa pump stations all have backup Marlborough Civil Defence Emergency Management Plan, 2017-2022 Page 23