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 Raw water supply environmental value A small proportion of total risks to raw water supply environmental values were of a high to very high level (Figure 8.2), and related to: • discharges from flood irrigated dairy farms in the Lower Murray (Jervois, Pompoota, Mannum/Cowirra, Mypolonga and Wall Flat irrigation township water supplies) for the pathogen, nutrients, and organic matter stressors • discharge from a major stormwater catchment in Mannum (Berryman Ave, adjacent to Mannum- Adelaide pipeline) for the pathogen, turbidity, and heavy metal stressors. 224 Nutrients Turbidity Organic Matter Heavy Metals Pesticides Hydrocarbons Salinity Low Mod High V high Figure 8.1 The level of risk (low, moderate, high, very high) versus proportion of total risks for stressors of the aquatic ecosystem environmental value
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options Pathogens Nutrients Organic Matter Heavy Metals Pesticides Hydrocarbons Turbidity Salinity A significant proportion of the total risks were of a moderate level (Figure 8.2) and related to: • creeks/rivers (eg Ral Ral Creek–Renmark off-take) • urban stormwater discharges (eg Renmark, Swan Reach, Mannum, Berri (Crawford Tce)) • STEDS (eg Cadell, Waikerie) • informal camping (eg Wall Flat, near Swan Reach–Stockwell pipeline off-take) • vessel wastewater discharges • Blanchetown river vessel waste disposal station (pathogens) • wetlands/lagoons (Cobdogla and Loveday basins, South Portee wetland, Yatco and Jaeschke lagoons) • nutrient and salinity leakage from horticultural areas (eg near Waikerie, Cadell, Gerard) • grazing (on banks of river and lakes). Low-level risks made up a large proportion of total risks (Figure 8.2) and related to a variety of hazards. Low Mod High V high Figure 8.2 The level of risk (low, moderate, high, very high) versus proportion of total risks for stressors of the raw water supply environmental value 225
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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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