Palerang
Indicator: Groundwater
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Please note: Text or data highlighted in this colour represent an update to this indicator for the period 2008/09.
What the results tell us for Palerang
Groundwater in the Palerang Council area is generally of a good to moderate quality and low yield (DLWC 1999), with a steadily decreasing water table over time due to drought (DWE 2008). Good quality groundwater fit for human consumption with little treatment can generally be found at higher altitude along the Great Dividing Range. Ground water suitable for some livestock, domestic and limited industrial uses can be found throughout the rest of the Council area.
Groundwater supplies
Groundwater flow in the Council area is mostly from intermediate flow systems in a mix of sedimentary, intrusive and extrusive Palaeozoic rock with a small area in the north-west consisting of recently deposited sedimentary Quaternary rock (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 Palerang Council area is less than 10 GL/yr compared with the natural recharge of more than 500 GL/yr (AWR 2000). This is considered a low level of extraction (extraction is 0 to 29% of recharge), and sustainable for the entire Shire. Table 1 presents data for bore water use from six Council controlled bores.
| Volume used ML/year | |||||
|---|---|---|---|---|---|
| Source | 2004-05 | 2005-06 | 2006-07 | 2007-08 | 2008-09 |
| Bore water | 264.5 | 255.9 | 277.8 | 253.38 | 275.1 |
Table 1 was added to include data for 2004/05 to 2008-09.
The State Water Corporation (SWC), on behalf of the Department of Water and Energy (DWE), administers much of the water allocation in rural 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, Palerang is 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
As part of its obligation under the Public Health Act 1991 the Palerang Council has an obligation to monitor potable water supplied to its residents. NSW Health reported that 100% of water samples from the Paerang domestic water supply passed.
Groundwater salinity in Palerang ranges from moderate to low (DLWC 1999). The high elevation Great Dividing Range supplies a low yield, good quality groundwater with less than 1,000mg/L salinity. At lower elevations, low quality (1,000-3,000 mg\L) groundwater suitable for livestock and limited domestic and industrial use is present.
The only area recognised as a salinity hazard is within a 20km2 region about 25km south-east of Queanbeyan (AWR 2005). This is anticipated to increase to approximately 110km2 by 2050 if no action is taken, along with risk of new areas totalling 16km2 being affected near Williamsdale, Bungendore and Bywong (see also Land Degradation).
Managing groundwater demand
Water conservation measures
Palerang Council area is located within both the Southern Rivers and Murrumbidgee Catchment Management Authority areas. In 2004 the Southern Rivers Catchment Management Authority (SRCMA) was established to guarantee the protection and sustainable development within its area of administration, including impact on water quality and use. With regard to groundwater, the SRCMA has the following water management targets in place (SRCMA 2007) for the Palerang 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.
At the time of writing, the Murrumbidgee Catchment Management Authority’s Action Plan and in turn water management targets, was not available.
The main groundwater conservation measure implemented by Palerang Council is the retention of water restrictions in Bungendore which is supplied by bore water (see Water Use chapter for more details).
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 Palerang Council area 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 coordinate 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 Palerang Council and 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. www.nlwra.gov.au.
Australian Water Resources (2005) Land Salinity Maps. www.nlwra.gov.au.
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.
NHMRC and ARMCANZ (1996) Australian Drinking Water Standards, National Health and Medical Research Council & Agricultural Resources Management Council of Australia and New Zealand, Canberra.
Palerang Shire Council 2007 (NSW) (2007) Annual Report, online at
http://www.palerang.nsw.gov.au/council/3121/3933.html
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
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
