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Salinity Province 71, Marnoo

Thumbnail image showing the location of the Marnoo Province in VictoriaThe medium sized Marnoo Salinity Province is underlain by local to intermediate scale Groundwater Flow Systems (GFSs) in deeply weathered fractured Palaeozoic rocks overlain by a regional to intermediate scale GFS that covers the area from the Great Dividing Range in the south to Lake Buloke in the north. The area is an alluvial flood plain with extensive discharge areas developed on the shallower GFS, particularly at the junction of the Avon and Richardson Rivers. Broad scale flooding has a major impact on groundwater levels in the area and, coupled with existing shallow watertables, drives salinity discharge in low-lying areas. Groundwater levels monitored in the area since the 1980s and continuing today have illustrated an extensive, flat piezometric surface that shows strong flood impacted fluctuations.

The main salinity mitigation option implemented has been the planting of perenial pastures, although much of this has recently been cropped with cereal and legumes. Some significant remnant vegetation has been identified along the main rivers and has been added to with revegetation plantings.

Province Attributes

Catchment Management Region:NORTH CENTRAL
Priority Status:High
Province Area:46,780 ha
Recorded Soil Salinity Area 1:684 ha
Dominant Surface Geology Type:Sedimentary
Influence of Geological Structure on Salinity Occurrence/s:None
Relevant Geomorphological Mapping Units (GMUs):4.2.X, 5.4
Predominant Groundwater Flow Systems (GFSs):Local/Intermediate & Intermediate/Regional
Relevant Irrigation Areas:N/A

Marnoo Salinity Province Map

A detailed map showing the Marnoo Salinity Province

Links to further reading and material related to the North Central Salinity Province
For further information relating to groundwater levels and salinities in this Province please see: Visualising Victoria's Groundwater (VVG)

1 Please Note: The ‘Recorded Soil Salinity Area’ indicated in the Salinity Province Attribute Table, comprises the total geographic area that has been mapped as having, or showing symptoms of, dryland soil salinity at some time (past or present). As dryland salinity occurrence in the Victorian landscape exhibits many different levels of severity and can change due to climate, landuse and vegetation, previously mapped areas may no longer be showing symptoms. In addition, as not all parts of the State have been mapped, or mapped in the same way, the mapping may not have captured some occurrences.

The soil salinity mapping used to calculate this ‘area’ does not cover irrigation regions. In irrigation regions, depth to watertable and watertable salinity mapping has been used to convey the threat of high watertables on soil waterlogging and/or soil salinisation and these areas are not included in this ‘area‘ calculation.

Please contact the Department, your Catchment Management Authority or your rural water provider for more information about salinity in your location.
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