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 156 Figure 6.3 Example of hazard in MW LAP area: dairy cows on flood irrigated pasture Risks to aquatic ecosystem health Figure 6.4 is the key map for risks to the aquatic ecosystem environmental value in the MW LAP area. The attached DVD has individual maps numbered according to the key map. Each hazard was assessed for relevant water quality stressors. The summary of identified risks to aquatic ecosystem health for water quality stressors (Table 6.1) shows that nutrients and organic matter have the highest frequency, followed by turbidity, hydrocarbons, pesticides, salinity and heavy metals. A significant number of low (345), moderate (290), high (61), and very high (25) risks were recorded. The very high risks were for the nutrients and organic matter stressors. Aquatic ecosystem risks identified in this LAP area are listed in Table 6.2 and discussed in more detail below for each stressor. Table 6.1 Frequency of risks to aquatic ecosystem health, MW LAP area Stressor Risk NU TU OR HM PE HY SA Total Low 37 60 41 15 84 64 44 345 Moderate 89 46 89 25 1 29 11 290 High 24 1 19 0 0 0 17 61 Very high 12 0 13 0 0 0 0 25 Total 162 107 162 40 85 93 72 721 NU—nutrients; TU—turbidity; OR—organic matter; HM—heavy metals; PE—pesticides; HY—hydrocarbons; SA—salinity
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options Note: shaded maps are included on the attached DVD; not all maps have hazards associated with them Figure 6.4 Key map for aquatic ecosystem zones, MW LAP area 157
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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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