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• W148971229 abstract "The low stream salinity naturally in the Nebine-Mungallala Catchment, extent of vegetationretention, relatively low rainfall and high evaporation indicates that there is a relatively lowrisk of rising shallow groundwater tables in the catchment. Scalding caused by wind andwater erosion exposing highly saline sub-soils is a more important regional issue, such as inthe Homeboin area. Local salinisation associated with evaporation of bore water from freeflowing bore drains and bores is also an important land degradation issue particularly in thelower Nebine, Wallam and Mungallala Creeks. The replacement of free flowing artesianbores and bore drains with capped bores and piped water systems under the Great ArtesianBasin bore rehabilitation program is addressing local salinisation and scalding in the vicinityof bore drains and preventing the discharge of saline bore water to streams.Three principles for the prevention and control of salinity in the Nebine Mungallala catchmenthave been identified in this review:• Avoid salinity through avoiding scalds – i.e. not exposing the near-surface salt inlandscape through land degradation;• Riparian zone management: Scalding often occurs within 200m or so of watering lines.Natural drainage lines are most likely to be overstocked, and thus have potential forscalding. Scalding begins when vegetation is removed, and without that binding cover,wind and water erosion exposes the subsoil; and• Monitoring of exposed or grazed soil areas.Based on the findings of the study, we make the following recommendations:1. Undertake a geotechnical study of existing maps and other data to help identify and targetareas most at risk of rising water tables causing salinity. Selected monitoring should thenbe established using piezometers as an early warning system.2. SW NRM should financially support scald reclamation activity through its variousfunding programs. However, for this to have any validity in the overall management ofsalinity risk, it is critical that such funding require the landholder to undertake a salinityhazard/risk assessment of his/her holding.3. A staged approach to funding may be appropriate. In the first instance, it would bereasonable to commence funding some pilot scald reclamation work with a view to furtherdeveloping and piloting the farm hazard/risk assessment tools, and exploring howsubsequent grazing management strategies could be incorporated within other extensionand management activities. Once the details of the necessary farm level activities havebeen more clearly defined, and following the outcomes of the geotechnical reviewrecommended above, a more comprehensive funding package could be rolled out topriority areas.4. We recommend that best-practice grazing management training currently on offer shouldbe enhanced with information about salinity risk in scald-prone areas, and ways ofminimising the likelihood of scald formation.5. We recommend that course material be developed for local students in Years 6 and 7, andthat arrangements be made with local schools to present this information. Given theconstraints of existing syllabi, we envisage that negotiations may have to be undertakenwith the Department of Education in order for this material to be permitted to be used.We have contact with key people who could help in this if required.6. We recommend that SW NRM continue to support existing extension activities such asGrazing Land Management and the Monitoring Made Easy tools. These aids should beable to be easily expanding to incorporate techniques for monitoring, addressing andpreventing salinity and scalding. At the time of writing staff of SW NRM were activelyinvolved in this process. It is important that these activities are adequately resourced tofacilitate the uptake by landholders of the perception that salinity is an issue that needs tobe addressed as part of everyday management.7. We recommend that SW NRM consider investing in the development and deployment ofa scenario-modelling learning support tool as part of the awareness raising and educationactivities. Secondary salinity is a dynamic process that results from ongoing humanactivity which mobilises and/or exposes salt occurring naturally in the landscape. Timescales can be short to very long, and the benefits of management actions can similarlyhave immediate or very long time frames. One way to help explain the dynamics of theseprocesses is through scenario modelling." @default.
• W148971229 created "2016-06-24" @default.
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• W148971229 date "2006-01-01" @default.
• W148971229 modified "2023-09-27" @default.
• W148971229 title "Improved salinity management for the Nebine / Mungallala / Wallam catchment" @default.
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