Groundwater Management Unit
Groundwater Management Unit: Wandin Yallock
Introduction
The groundwater resource characteristics for the Wandin Yallock 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 Wandin Yallock's groundwater resource?
Vital Statistics:
| Area | 40 km2 |
|---|---|
| Total Water Allocated | 2,580 ML/yr |
| Total Water Used | 1,515 ML/yr |
| Average Salinity | 200 mg/L |
| Sustainable Yield | 3,300 ML/yr |
| Depth to top of aquifer | 20 m |
Aquifer Description:
Semi confined fractured rock system within the Older Volcanics basalt.
Method used for determining sustainable yield:
The PAV for the Wandin Yallock GMA is based on the rainfall recharge (4,540 ML/year) plus river recharge (584 ML/year), less discharge (1,825 ML/year) from the aquifer to the river. This equates to 3,300 ML/year. It has been obtained using limited information and estimations rather than measurements. The simplicity of the calculations possible does not reflect the complex nature of the aquifer system and therefore only a low degree of confidence applies.
Assumptions used for allocating development categories:
Groundwater categorisation was assessed in terms of the requirements of the audit documentation. Information applied to the categorisation of both abstractions and allocations was based on the best information available from a combination of information supplied by the responsible Rural Water Authority and information from the Groundwater Database.
Forward projections of abstraction were based on a combined surface and groundwater demand evaluation model. This model projected potential demand for water based on predictions of population growth, industry development, agricultural development and water consumption trends.
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) |
|---|---|---|---|---|
| VIC98397 | 28-Jan-75 | 27-Sep-99 | 55 | 248 |
| VIC98398 | 21-Jul-75 | 27-Sep-99 | 98 | 268 |
| VIC98402 | 20-Nov-75 | 27-Sep-99 | 41 | 195 |
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)
- Namadgi (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)
- Young Granite (NSW)
Further information
- Victoria Water Resources Assessment 2000 Report
- Victoria Water Resources Assessment 2000 Technical Report
- For more information about water and other natural resource issues link to www.dse.vic.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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