S2.1.2 Choose source Turbidity and Back-up supply Choose alternative with manageable colour is likely to be or additional source. Unusual changes in measurements frequently weather unusual weather after heavy required. conditions events. rainfall. No back up 5 year low flow supply Ensure that a data available. back-up supply will be available for emergencies. S2.1.3 Generator for use Unreliable Plan to have in situation of power supply. generator available. Power failure power failure. No generator available. Adequate No storage Include storage storage. available, either facilities in design pre- or post specifications. treatment. Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed Event: POOR, CHANGEABLE OR DETERIORATING WATER QUALITY Possible hazards: Germs; chemical determinands Level of Risk: High1 S2.2.1 Sampling of As determined Sample results Initiate appropriate source water as by assessment not available. sampling. Adequate follows (minimum through use of water quality number of water safety plan data not samples): S1.1 available During wet weather chemical, radiological). During summer During winter For As defined in Methodology Initiate groundwater groundwaters, DWSNZ:2000. described in security initiate 2000 not determination. determination of followed. (If groundwater supply is found security. to be See water safety treatment to plan P1.3 ensure microbiological quality will be required).
S2.1.2 Unusual weather conditions Choose source with manageable changes in unusual weather events. Turbidity and colour measurements after heavy rainfall. 5 year low flow data Back-up supply is likely to be frequently required. No back up supply available. Choose alternative or additional source. Ensure that a back-up supply will be available for emergencies. S2.1.3 Power failure Generator for use in situation of power failure. Unreliable power supply. No generator available. Plan to have generator available. Adequate storage. No storage available, either pre- or post treatment. Include storage facilities in design specifications. Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed Event: POOR, CHANGEABLE OR DETERIORATING WATER QUALITY Possible hazards: Germs; chemical determinands Level of Risk: High1 S2.2.1 Adequate water quality data not available chemical, radiological). Sampling of source water as follows (minimum number of samples): During wet weather During summer During winter As determined by assessment through use of water safety plan S1.1 Sample results not available. Initiate appropriate sampling. For groundwaters, initiate determination of groundwater security. See water safety plan P1.3 As defined in DWSNZ:2000. Methodology described in 2000 not followed. (If supply is found to be treatment to ensure microbiological quality will be required). Initiate groundwater security determination.
new-supplies-feb14-v2.docx