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Drinking Water

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Drinking Water Drinking water Abstraction of water from sources (total volume, m3) Consumption of drinking water (m3 per connection, per day) Purpose of indicator Underground water supplies are an essential resource providing water for drinking and other domestic and commercial uses. Measuring how much is abstracted can be used as an indicator of pressure on the resource. Water seeps through the ground to replenish underground stores, but if it is extracted faster than it is replenished at some point there will be a deficit. Consumption of water is considered the demand (amount required) to be met by extracting water from underground resources. Understanding water users and how much they use is a starting point for managing and planning for water infrastructure, treatment and sustainability. Current information and trend Public water supply is managed by Rotorua District Council. There are currently seven public water supply sources harvested for supply of drinking water to Rotorua urban areas, and rural areas including Mamaku, Rotoiti, Rotoma, Kaharoa, Reporoa, Hamurana and Okareka. Each supply is monitored for safety of drinking water and volume of water extracted. Usually trends in population and water abstraction follow each other closely (figure 1). As population increases so does the demand for water. Long term trends show that since 2002 the estimated population level has been increasing at a slow but steady rate, while water abstraction has remained steady. However, short term trends (figure 2) show that in 2008 water abstraction volume peaked at ~147,000,000 m3 and has since dropped to less than 140,000,000 m3 in 2012, despite a small increase in population. Figure 3 shows the greatest consumer of water (demand) is the residential sector, followed by the commercial sector and lastly the agricultural sector. Consumption of water has remained steady for all three sectors since 2002, again, despite population increase. Rotorua State of the Environment Reporting 2012 1 Long term trends for water abstraction and population 16000000 70000 69000 14000000 68000 12000000 67000 10000000 66000 8000000 65000 64000 Population 6000000 Volume (cubic metres) (cubic Volume 63000 4000000 62000 2000000 61000 0 60000 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 Year Volume Estimated population Trend (Estimate Population) Trend (Volume) Figure 1 Source: Rotorua District Council, 2012 and Statistics New Zealand, 2012 Water abstraction and population trends 2008 to 2012 16000000 70000 69000 14000000 68000 12000000 67000 10000000 66000 8000000 65000 64000 Population 6000000 63000 Volume (cubic metres) 4000000 62000 2000000 61000 0 60000 2008 2009 2010 2011 2012 Year Volume Estimated population Trend (Estimated population) Trend (Volume) Figure 2 Source: Rotorua District Council, 2012 and Statistics New Zealand, 2012 Rotorua District Council has identified six major water supply projects in the 2012-2022 Long-term Plan. These include the following: • Investigation into potential alternative source to Taniwha Springs for Ngongotaha water supply • Automatic shut-off valves to protect water supplies in the event of an earthquake • A link between the Eastern and Central water supplies for continued supply in an emergency • Upgrading and upsizing pipe capacity in the urban and Mamaku networks to comply with fire fighting flow requirements • Dividing the water supply network into smaller sectors for better pressure management and analysis for breakages and leakages. • Moving or replacing Eastern and Victoria Street Arterial services at the time they are constructed. Rotorua State of the Environment Reporting 2012 2 Water consumption by sectors 12000000 10000000 8000000 6000000 Metres cubed (m3) cubed Metres 4000000 2000000 0 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 Year Agricultural Commercial Domestic Figure 3 Source: Rotorua District Council, 2012 and Statistics New Zealand, 2012 In summary • Since 2002 estimated population has increased slightly, while water abstraction has remained steady • The greatest demand for water is from the residential sector, then the commercial sector and the agricultural sector. • Consumption of water has remained steady for all sectors. • Six major projects are identified for water supply services in council’s Long-term Plan 2012-2022 Further information www.rdc.govt.nz www.waikatoregion.govt.nz www.boprc.govt.nz www.mfe.govt.nz Rotorua State of the Environment Reporting 2012 3 .
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