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 19 The EPA to audit STEDS/wastewater lagoons and infrastructure identified as a risk in this assessment and enforce licence conditions and Water Quality EPP if necessary. 238 Status of implementation: Not started The Mannum and Murray Bridge WWTP effluent ponds located on the floodplain immediately adjacent to the river were noted to pose a high risk. Some concerns were also noted with associated effluent pumps leading to the Murray Bridge plant. Management option 20 SA Water to assess the risk of the Mannum and Murray Bridge WWTP lagoons (and associated effluent pumps) on the River Murray floodplain and consider whether risk reduction measures are required. Status of implementation: Not started but sites have Environmental Management Systems in place Uncertainties in the risk assessment: The site-specific risk of flooding and/or failure of lagoons on the floodplain was somewhat uncertain. Stormwater infrastructure Risk level: moderate–high Possible options: monitoring, capital works, capacity building Suggested lead stakeholders: SAMDB NRMB, local councils, SA Water, EPA Most stormwater discharges were typically assigned a moderate risk level but some in close proximity to water off-takes were rated as a high risk (eg Mannum, Renmark, Swan Reach). Several townships (eg Renmark, Mannum and Murray Bridge) have a large number of discharge points within a small area, and the cumulative effect of these is of potential concern. Some areas have gross pollutant traps (GPTs) or other stormwater management systems (eg diversion to wetland areas) for their stormwater discharges. GPTs only trap sediments and large debris, and some pollutants will still reach the river. A number of stormwater management plans have been created for river and lake councils (see Rural City of Murray Bridge 1998; Kinhill 1999 & 2000; Alexandrina Council 2003; Coorong District Council 2004) but the degree of implementation planned and funded is uncertain. It may be difficult to retro-fit treatment systems to existing outlets, and for sedimentation basins or wetlands to be economic. Reasonably large areas of land are required near current discharge points. In many cases councils are constrained by the historical design of the systems. Stormwater management must also be focused on reducing inputs of contaminants to the stormwater system, through education of industry and the community. The EPA produces a number of stormwater guidelines and codes of practice for various industries.
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options Management option 21 SAMDB NRMB to review progress of implementation of stormwater management plans. Status of implementation: Not started Funding options should be explored to assist councils to undertake necessary capital works for priority locations. Status of implementation: Underway and ongoing SA Water should further assess stormwater risks to water offtakes and consider supporting mitigation options to reduce risks where necessary. Status of implementation: Not started Management option 22 Agencies (eg SAMDB NRMB, EPA and LAP groups) collaborate to put an increased focus on community education and industry auditing to achieve behaviour change to minimise inputs of pollutants to the stormwater systems in river and lake townships. Status of implementation: Not started Incorporating water sensitive urban design (WSUD), including best practice stormwater management, into new developments would be beneficial to reduce stormwater inputs of pollutants to the river and lakes. Management option 23 New developments should incorporate WSUD eg grass swales instead of gutters, rainwater storage tanks, retention basins and wetlands. Council development plans should be amended to reflect the importance of a more rigorous approach to dealing with stormwater. Status of implementation: Not started Uncertainties in the risk assessment: Certainty was low for some stormwater discharge points of concern near raw water off-takes due to a lack of water quality and flow data; some limited water quality data exists for Murray Bridge (Jaensch Rd), Mannum and Berri outfalls. Management option 24 Further monitoring of stormwater quality for discharges near raw water off-takes in Mannum, Renmark, Berri and Swan Reach Status of implementation: Some current monitoring underway and a report in production (by SAMDB NRMB) for Berri and Mannum discharges 239
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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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