2 Renmark to border LAP area assessment - EPA - Sa.gov.au

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River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options Management option 5 SAMDB NRMB, DWLBC, LAP groups, and irrigation trusts are to continue to work to improve water efficiency and reduce drainage from horticultural areas including compliance and enforcement of water efficiency targets, education of irrigators and upgrading of systems (eg conversion to dripper irrigation) 232 Status of implementation: Ongoing, existing programs being undertaken Several major strategies are in place to reduce the effects of horticultural drainage on the river (eg Noora disposal basin, Waikerie and Bookpurnong salt interception schemes). Further salt interception schemes (eg Loxton) are under construction. These schemes help mitigate and significantly delay the effects of drainage discharges on the river. Management option 6 Continued implementation of salt interception and other drainage schemes in priority areas (eg Pike/Murtho) to reduce groundwater/drainage inputs to the river. Status of implementation: Feasibility study underway for Pike/Murtho areas Uncertainties in the risk assessment: Recent information on the relative influence of groundwater transport of pollutants from horticulture land uses on the water quality of the River Murray was lacking for parameters except salinity. Monitoring in other areas of the state has identified high nutrient, organic matter and heavy metal levels. Management option 7 Monitoring of selected salt interception scheme drainage and/or selected groundwater boreholes for nutrients, organic matter, heavy metals and pesticides. Input of these constituents to the river may be able to be estimated using existing salinity input models. Creeks/rivers Status of implementation: Not started Typical risk level: moderate–high Possible options: monitoring, policy/planning, compliance, research and development Suggested lead stakeholders: EPA, DWLBC, SAMDB NRMB, LAP groups The larger tributary rivers and creeks (eg Marne, Angas, Bremer, Finniss, Pike, Ral Ral, Salt) were identified as a high risk to water quality for various stressors, and smaller creeks typically recorded a
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options moderate rating. Many creeks and rivers received horticultural drainage (particularly those in the Riverland) and other inputs (eg stormwater, waste water, mining discharges). River and creek discharges were risk assessed as a point sources but assessment of activities in their entire catchments was considered outside the scope of this stage of the study. The moderate-high risk levels suggest that further investigation of hazards in their catchments is required before detailed management strategies can be developed. Management option 8 Further investigation of land uses and hazards to water quality in creek and river catchments, possibly extending the risk assessment to these areas (SAMDB NRMB, EPA, DWLBC, SA Water). Status of implementation: Not started but ongoing individual agency work in some areas Reducing horticulture drainage impacts on creeks and rivers (eg through more efficient irrigation practices) is also important. Work is underway on the water allocation planning/ prescription process for the Eastern Mount Lofty Ranges which will provide better understanding of the flows from Marne, Angas, Bremer and Finniss rivers. It includes upgrading of instrumentation and performing flow ratings. Management option 9 DWLBC should complete water allocation and prescription process and water use and efficiency targets should be strictly enforced for all areas. Status of implementation: Underway and ongoing Salt Creek was identified as a moderate nutrient and organic matter risk although there was some uncertainty as to the ecological impact on the Coorong. Current DWLBC monitoring and ecological risk assessment work will enable this assessment to be refined. Increased tidal flushing is seen as critical for improving the water quality of the Coorong, and plans are currently being implemented (MDBC 2005). Management option 10 DWLBC to continue to monitor Salt Creek discharge and perform ecological risk assessment research. DWLBC, DEH, EPA to continue to monitor Coorong water quality. Status of implementation: Monitoring program fully implemented by DWLBC, risk assessment framework to be finalised Uncertainties in the risk assessment: Large rainfall events in creek and river catchments are likely to result in the input of large loads of contaminants to the river and/or lakes but the relative influence of these events on water quality or environmental values was uncertain. 233
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E N V I R O N M E N T P R O T E C T
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The River Murray and Lower Lakes ca
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6 Mannum to Wellington LAP area ass
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Table 6.5 Frequency of risk to recr
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Figure 7.2 Example of hazard to wat
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Roz Becker, Riverland Tourism Assoc
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Abbreviations 10 ADWG Australian Dr
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Executive Summary The River Murray
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River Murray and Lower Lakes catchm
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2 Renmark to border LAP area assessment - EPA - Sa.gov.au

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