Groundwater Management Unit
Groundwater Management Unit: Namadgi
Introduction
The groundwater resource characteristics for the Namadgi groundwater managment unit are presented below. This includes technical detail on aquifer properties and water level change for key monitoring bores.
What is the character of Namadgi's groundwater resource?
Vital Statistics:
| Area | 1,435 km2 |
|---|---|
| Total Water Allocated | 450 ML/yr |
| Total Water Used | 130 ML/yr |
| Average Salinity | 350 mg/L |
| Sustainable Yield | 54,600 ML/yr |
| Depth to top of aquifer | 70 m |
Aquifer Description:
Method used for determining sustainable yield:
The sustainable yield is the level of extraction, measured over a specified planning timeframe, that should not exceeded to protect the higher value social, environmental and economic uses associated with the aquifer. The groundwater extraction regime, mesured over a specified planning time frame, that allows acceptable levels of stress and protects the higher value uses associated with the total resources. The definition is framed around an extraction regim not an extraction volume. Sustainable yield is based on average annual recharge which is 54.6 GL/Year.
Are groundwater levels changing?
Technical information on the key groundwater bores and monitoring stations is presented below, including hydrographs where available. Link to a discussion on groundwater levels and trends at a State level as it relates to dryland salinity.
| Bore ID | Start record | End record | Depth of bore (m) | Reduced level (m) |
|---|---|---|---|---|
| ACT000601 | 23-Dec-70 | no data | 933 | |
| ACT000617 | 07-May-66 | 12-Aug-87 | no data | 1,236 |
| ACT000629 | 27-Apr-66 | 12-Aug-87 | no data | 1,066 |
The following groundwater management units also occur in Lachlan Province:
- Alexandra (VIC)
- Araluen Alluvium and Weathered Granite (NSW)
- Ascot (VIC)
- Bell Valley Alluvium (NSW)
- Belubula River Alluvium (NSW)
- Billabong Creek Alluvium (NSW)
- Bullarook (VIC)
- Bungaree (VIC)
- Cudgegong Valley Alluvium (NSW)
- Glengower (VIC)
- King Lake (VIC)
- Lancefield (VIC)
- Lower Macquarie Alluvium (NSW)
- Mid Murrumbidgee Alluvium (NSW)
- Mid and Upper Murrumbidgee Catchment Fractured (NSW)
- Molong Limestone (NSW)
- Moolort (VIC)
- Mudgee Limestone (NSW)
- Murrumbidgee (ACT)
- Orange Basalt (NSW)
- Queanbeyan and Molonglo (ACT)
- Spring Hill Groundwater Supply Protection Area (VIC)
- Tourello (VIC)
- Unincorporated Area - Lachlan (VIC)
- Unincorporated Area - Lachlan Fold Belt Province (NSW)
- Upper Lachlan Alluvium (NSW)
- Upper Macquarie Alluvium (NSW)
- Wandin Yallock (VIC)
- Young Granite (NSW)
Further information
- Australian Capital Territory Water Resources Assessment 2000 Report
- Australian Capital Territory Water Resources Assessment 2000 Technical Report
- For more information about water and other natural resource issues link to www.environment.act.gov.au.
- Link to data available for download on the Groundwater management units and provinces - ARC/INFO export
- Link to Map maker to make a map using this information.
Key
Links to an another web site
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