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 Urban stormwater discharges (predominantly from Mannum and Murray Bridge townships) posed a moderate pathogen risk. The actual risk could be lower as people would tend not to swim or ski during or immediately following rainfall events. Septic tank waste disposal systems (eg in the shack area downstream of Murray Bridge, Sunnyside, Wellington, Avoca Dell) were also considered to pose a moderate risk. Of similar concern are the effluent pump stations located close to the river (eg Murray Bridge WWTP pumps, STEDS pumps at various shack locations). In the event of system failure at the Murray Bridge pump stations, it is estimated that only 30 minutes would be needed for operators to install a back-up generator or a waste contractor to prevent sewage entering the river. An informal camping area at Mypolonga posed a moderate risk to recreational values. Wetlands posed a low risk, mainly due to possible outflow of bird faecal material and surrounding septic tank systems in the case of Riverglades wetland. The Murray Bridge and Mannum WWTP effluent ponds were not in a defined recreation zone (so were not assessed for this value) but pond bank failure or overtopping there could have a major impact on recreational values for a large distance downstream (see aquatic ecosystem value section for more detail). Nutrients The risk of nutrient discharges from a hazard affecting recreation was assessed as the likelihood of an algal bloom (eg blue-green algae). Blooms create a risk to recreation as certain algae can cause skin irritation and are toxic if ingested. This was considered an unlikely occurrence from a single hazard as other factors, such as elevated temperatures and low flow, are also necessary. The only risks to receive moderate rankings were from the LMRIA drainage discharges/event discharges, discharge of greywater or blackwater in marinas (Long Island, Ukee, Riverglen, Wellington), discharge from Rocky Gully creek/wetland, and leakage from horticultural areas (Toora and Woodlane). Low risk hazards included retired/non-irrigated area discharges from the LMRIA, urban stormwater, landfills, river vessel waste disposal stations and toilets/septic tanks in several locations. The possibility of nutrients (predominantly nitrate) from leakage of shack septic tank soakage trenches resulting in localised algal growth requires further research. Hydrocarbons Diesel motors and fuel tanks that are unbunded and located on the river’s edge posed a low risk to recreational environmental values (potential oil and fuel spills). Possible leakage from petrol station storage tanks and accidental spillages from marinas/vessel mooring and refuelling locations was also considered a low risk, as were urban stormwater discharges. These risks are predominantly to aesthetic values, as people would be likely to avoid bathing in an area with visible oil slicks. Turbidity Moderate turbidity risks to recreational values existed for urban stormwater discharges and event discharge from Rocky Gully creek/wetland. As people are likely to avoid swimming/skiing during rainfall conditions, the risk may be mainly to aesthetic values. Wake-induced erosion of riverbanks in high-use recreation areas was a common community concern. This was assessed as a low risk but its actual impact on recreational values was difficult to quantify. 178
Table 6.6 Summary of risks to recreational environmental values, MW LAP area low=low risk, mod=moderate risk, high=high risk, v high=very high risk River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options certainty value (in italics) follows each risk ranking GEOCODE HAZARD EVENT TYPE PA TU NU HY ANIMAL HUSBANDRY MW002B Piggery, EPA Lic # 12761—Murrawong EVENT DISCHARGE low 2 low 2 MW003B Piggery, EPA Lic # 12759—Glen Lossie EVENT DISCHARGE low 2 low 2 CREEK/RIVER MW080A Wetland discharge, Rocky Gully DISCHARGE mod 2 low 2 mod 2 low 2 MW080B Creeks/wetland discharge, Rocky Gully EVENT DISCHARGE mod 2 mod 2 low 2 low 2 DREDGING SITE MW194T Dredging, EPA Lic # 12770—Mannum golf course SEDIMENT DISTURBANCE low 2 MW233T Dredging, EPA Lic # 14347—Ukee Boat Club SEDIMENT DISTURBANCE low 2 FERRY MW241H Ferry, Mannum ACCIDENTAL SPILLAGE low 2 MW314H Ferry, Mannum EVENT DISCHARGE low 2 low 2 FLOOD-IRRIGATED AREA DISCHARGE MW054A Irrigation area—one dairy farm, Toora DISCHARGE high 2 mod 2 MW054B Irrigation area—one dairy farm, Toora EVENT DISCHARGE mod 2 low 2 mod 2 MW059A Irrigation area—retired, feedlot on highland, Mobilong DISCHARGE low 2 low 2 MW059B Irrigation area—retired, feedlot on highland, Mobilong EVENT DISCHARGE mod 2 low 2 mod 2 MW118A Irrigation area—dairying, Monteith DISCHARGE v high 3 mod 2 MW118B Irrigation area—dairying, Monteith EVENT DISCHARGE high 3 low 2 mod 2 MW127B Retired land, Kilsby swamp EVENT DISCHARGE low 3 low 2 low 2 MW138A Irrigation area—dairying, Wellington end, Jervois DISCHARGE v high 3 mod 2 MW138B Irrigation area—dairying, Wellington end, Jervois EVENT DISCHARGE high 3 low 2 mod 2 MW174A Irrigation area—dairying, Long Island DISCHARGE v high 3 mod 2 MW174B Irrigation area—dairying, Long Island EVENT DISCHARGE high 3 low 2 mod 2 MW179A Irrigation area—beef, urban stormwater input, Burdett DISCHARGE high 3 mod 2 MW179B Irrigation area—beef, urban stormwater input, Burdett EVENT DISCHARGE mod 3 low 2 mod 2 MW181A Irrigation area—dairying, Long Flat DISCHARGE v .high 3 mod 2 MW181B Irrigation area—dairying, Long Flat EVENT DISCHARGE high 3 low 2 mod 2 MW182A Irrigation area—one dairy farm, Nth end Yiddinga DISCHARGE high 3 mod 2 179
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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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