Eurobodalla
Indicator: Groundwater
Results for this indicator are also available for [an error occurred while processing this directive]
What the results tell us for Eurobodalla
Groundwater in the Eurobodalla Shire is reported in the past to have been of moderate quality (DLWC 1999). The quality of the groundwater is generally not considered suitable for human consumption but can be used for some livestock, limited domestic and industrial uses without treatment.
Groundwater supplies
Groundwater flow in the Shire is almost entirely from local flow systems in sedimentary Palaeozoic rock with small regions of younger intrusive rock near Batemans Bay (DPI 1998). Bore hydrograph data indicates a consistent seasonally adjusted drop in water levels for the reporting period 2004 to 2008, continuing a trend observed since 1991. A low natural rainfall is likely to be the most significant factor which is further compounded by an increase in extraction (Beale et al. 2004).
Groundwater use
Total groundwater extraction in the Eurobodalla Shire is less than 10 GL/yr compared with the natural recharge of more than 500 GL/yr (AWR 2000). This is considered a low to moderate level of extraction (0 to 69% extraction of recharge), and sustainable for the entire area. The Shire Council does not extract groundwater to supplement its water supply.
The State Water Corporation (SWC), on behalf of the Department of Water and Energy, administers much of the water allocation in rural New South Wales (NSW). To recover the cost of administration, infrastructure and future investment, the SWC charges each licensed user. Base charges are either $51.46 for non-monitored or $118.56 for monitored areas, plus a per megalitre access charge. As part of the South Coast groundwater area, Eurobodalla Shire groundwater users are charged a $2.70/ML access charge and $1.35/ML usage charge. Although base charges are consistent throughout the state, access and usage charges are the highest in the state (SWC 2008).
Groundwater quality
Groundwater salinity in the Eurobadalla Shire is moderate (1,000-3,000 mg\L) (DLWC 1999), with little variation throughout the region. Water is considered suitable for livestock and limited domestic and industrial use only. Groundwater in the area is unsuitable for human consumption without treatment.
Eurobadalla Shire has virtually no recognised salinity hazards up to the year 2050 (AWR 2005). The only exception to this are two small areas near Garlandtown (around 5km2) and Turlinjah (around 2km2).
Managing groundwater demand
Water conservation measures
In 2004, the Southern Rivers Catchment Management Authority (SRCMA) was established to guarantee the protection and sustainable development with in its area of administration, including impact on water quality and use. Eurobodalla Shire is entirely within the boundaries of the SRCMA. With regard to groundwater, the SRCMA has the following water management targets in place (SRCMA 2007) for the Eurobodalla Shire:
- by 2008, 80% of priority groundwater will be managed according to a water sharing/management plan.
- by 2016, the quality of priority water bodies will be maintained or progressively improved
- by 2016, all water utilities will manage water systems consistent with best practices
- by 2016, residential consumption will progressively be reduced to a set benchmark
- by 2016, a 20% reduction in water use on 2005 usage by irrigators.
Laws and policy
Outside of regional Catchment Management Authority policies, the use and treatment of groundwater is generally the same throughout NSW. Specifically water management and use in the Eurodalla Shire is covered under:
- NSW Water Extraction Monitoring Policy (2007): Designed to increase the extent of active monitoring of water extraction to cover 90% of the total volume of water extracted for each water sharing plan.
- NSW Water Extraction Monitoring Standards (2005): Designed to increase the quality of groundwater extraction monitoring.
- National Water Initiative (2004): NSW is a party to the National Water Initiative (NWI), a national initiative to coordinated Australia's water supply to guarantee the greatest possible social, economic, and environmental benefits.
- NSW NWI Implementation Plan: Addresses the initiatives set out in the NWI specific to the State of NSW.
- Living Murray and Snowy Initiatives (2002): Initiative between Federal and State governments concerned predominately with surface water, however, may indirectly impact on groundwater.
- Water Management Act 2000 (NSW): Aim is to protect the supply of water to the environment and water users. Its introduction has been gradual and once fully implemented will largely supersede the Water Act 1912.
- NSW Groundwater Quality Protection Policy (1998): Aim is largely to protect groundwater resources against pollution.
- Local Government Act 1993(NSW): Covers the quality of water supplied for human consumption by local Council, including groundwater as a source.
- Water Act 1912 (NSW): Largely superseded by the Water Management Act 2000 but some provisions still apply.
- Australian Constitution (1901): Section 100 of the Constitution outlines the States primacy over the Commonwealth in terms of laws and regulations affecting the use and conservation of water.
About the data
Data was supplied by the NSW Department of Water and Energy. Threshold salinity values of 800 µS/cm and 1,600 µS/cm were used for water quality assessment. They represent the maximum desirable water standard set by the World Health Organisation for human consumption (800 µS/cm) and a threshold at which adverse environmental changes can be expected (1,600 µS/cm) (NHMRC and ARMCANZ 1996).
Groundwater with less than 1,000 mg of salt per litre is also considered good quality and suitable for drinking water and most uses; groundwater with 1,000–3,000 mg of salt per litre is considered fair to poor and suitable for livestock, some domestic and limited industrial uses (DLWC 1999).
mg/L = milligrams per litre
References
Australian Water Resources (2000) National Land and Water Audit.
Beale G, Miller M, Barnett P, Summerell G, Gilmore R and Hoey D (2004) NSW Coastal Salinity Audit, Department of Infrastructure Planning and Natural Resources, Sydney, online at http://www.dnr.nsw.gov.au/salinity/science/pdf/coastal_audit1.pdf.
Department of Land and Water Conservation (NSW) (1999) Groundwater Quality Protection Policy, Department of land and Water Conservation, Sydney, on line at http://www.dnr.nsw.gov.au/water/pdf/nsw_state_groundwater_quality_policy.pdf.
Department of Land and Water Conservation (NSW) (2001) Groundwater Vulnerability Map and Explanatory Notes, Department of Land and Water Conservation, Sydney, on line at http://www.dnr.nsw.gov.au/water/pdf/lachlan_vulnerability_map.pdf.
Department of Primary Industries (NSW) (1998) Geological Map of New South Wales (1:250000 scale)
Department of Water and Energy (NSW) (2006) 2005/06 Water Supply and Sewage Benchmarking Report on line http://www.deus.nsw.gov.au/Publications/dwe_nsw_water_supply_and_sewerage_
benchmarking_report_2005-06.pdf
Department of Water and Energy (NSW) (2008) – Bore Location Information supplied in GIS format.
DLWC - see Department of Land and Water Conservation
DPI – see Department of Primary Industries
DWE – see Department of Water and Energy
Eurobodalla Shire Council 2007 (NSW) (2007) Annual Report, online at
http://www.Eurobodallavalley.nsw.gov.au/Your_Council/Annual%20Report/Annual_Report.htm
NHMRC and ARMCANZ – see National Health and Medical Research Council and Agriculture and Resource Management Council of Australia and New Zealand
National Health and Medical Research Council and Agriculture and Resource Management Council of Australia and New Zealand (1996) Australian Drinking Water Standards, National Health and Medical Research Council & Agricultural Resources Management Council of Australia and New Zealand, Canberra.
State Water Corporation (NSW) (2008) Water Management Charges for Licensed Water Users on line http://www.statewater.com.au/watdel/water_mgt_charges_for_licensed_water_20080124.pdf
Southern Rivers Catchment Management Authority (NSW) (2007) SRCMA Annual Report 2006/2007 online at
http://www.southern.cma.nsw.gov.au/pdf/SRCMA_AR2007body.pdf
SWC - see State Water Corporation
SRCMA - see Southern Rivers Catchment Management Authority
