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 Risks to recreational use Figure 6.5 is the key map for risks to the recreational environmental value in the MW LAP area. The attached DVD has individual maps numbered according to the key map. 176 Note: only hazards identified in the shaded areas were assessed for risk to recreational values Figure 6.6 Key map for recreation zones, MW LAP area
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options Frequencies of identified risks to recreational values for the various water quality stressors are summarised in Table 6.5. The highest frequency of risks was for pathogens, followed by nutrients, hydrocarbons and turbidity. The majority of these risks (207) were assessed as low level, although a significant number (91) of moderate, high (9), and very high (5) risks were identified (for pathogen stressor). Table 6.5 Frequency of risks to recreational use, MW LAP Stressor Risk PA NU TU HY Total Low 24 77 44 62 207 Moderate 63 9 17 2 91 High 9 0 0 0 9 Very high 5 0 0 0 5 Total 101 86 61 64 312 PA—pathogens; NU—nutrients; TU—turbidity; HY—hydrocarbons Table 6.6 lists the recreational risks identified in this LAP area, which are discussed in more detail below for each stressor. Pathogens Very high pathogen risks were identified for discharges from flood irrigated dairy farms at Monteith (Whitesands-Riverglen marina recreational zone), the Wellington end of Jervois (Placid Estates recreational zone), Long Island and Long Flat (Murray Bridge and surrounds recreational zone) and Cowirra (Mannum and surrounds). The high ranking resulted from a frequent likelihood (daily-weekly during irrigation season) and high consequence (risk over a widespread area). The practice of flood irrigation of dairy farms often generates runoff of large amounts of water polluted with cow faecal material. The overall result of several discharges from the LMRIA (ca. 5000 ha area) to the river is that indicator (of risk to human health) bacteria levels in the river increase significantly below Mannum to levels that often exceed recreational water guidelines (EPA 2001a; Eco Management Services 2003). Discharge from Yiddinga irrigation area posed a high pathogen risk to a recreation zone at Swanport aquatic camp and some other areas were considered to pose a moderate risk (eg Glen Lossie, not intensively grazed or irrigated). Event discharges from the LMRIA had a slightly lower risk ranking in general as rainfall events resulting in runoff are much less frequent than ‘normal’ discharges due to irrigation. There was some uncertainty to this assessment as rainfall event discharges may contain higher levels of pathogens from wash-off of dairy milking shed and calf rearing yards on highland areas. The significant rehabilitation project underway in all areas of the LMRIA will significantly reduce the risks to the river. Other sources of moderate pathogen risk included several marinas (Ukee, Long Island, Riverglen, Wellington), vessel/houseboat mooring areas (eg Mannum, Westbrook caravan park, Avoca Dell). However, there was some uncertainty about the extent of greywater and blackwater discharges from permanently moored vessels in these areas. 177
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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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