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 6.2 Environmental value zones Spatial zones assigned for each environmental value allowed hazards to be identified and assessed for risk in manageable amounts. Aquatic ecosystem zones Risks to aquatic ecosystem health were assessed in arbitrary three kilometre zones for the length of the river, a total of 28 zones between Mannum and Wellington. Raw water supply zones Seven raw water supply zones (from 500 m downstream to three kilometres upstream of each potable water off-take) were identified between Mannum and Wellington: MWRAW001 Mannum (Mannum township and Mannum-Adelaide pipeline) and Cowirra township (unfiltered) water supply off-takes MWRAW002 Wall Flat water supply off-take (unfiltered) MWRAW003 Pompoota water supply off-take (unfiltered) MWRAW004 Mypolonga water supply off-take (unfiltered) MWRAW005 Murray Bridge water supply off-take (Murray Bridge township and Murray Bridge to Onkaparinga pipeline) MWRAW006 Tailem Bend (Tailem Bend township and Tailem Bend-Keith pipeline) and Jervois township (unfiltered) water supply off-takes Recreational zones Ten recreational zones were identified between Mannum and Wellington: MWREC001 Mannum and surrounds (3.5 km long) MWREC002 Pompoota and surrounds (2.2 km long) MWREC003 Sunnyside recreation area and surrounds (7 km long) MWREC004 Toora shacks and surrounds (2 km long) MWREC005 Riverglades (3.4 km long) MWREC006 Murray Bridge–Long Island and surrounds (4.8 km long) MWREC007 Swanport (4.8 km long) MWREC008 Whitesands–Riverglen marina (2.4 km long) MWREC009 Westbrook (1.5 km long) MWREC010 Jervois–Tailem Bend (2.1 km long) MWREC011 Placid Estate (1.9 km long) MWREC012 Wellington marina (1.6 km long) MWREC013 Wellington Spit (0.6 km long). 6.3 Hazard identification process A community consultation workshop was held with representatives from the Mannum to Wellington LAP office, Rural City of Murray Bridge Council, SAMDB NRMB, Lower Murray irrigators and representative groups (eg Lower Murray Irrigation), EPA, SA Water, DWLBC, and local landowners. The workshop identified the nature and location of potential water quality hazards and recreation zones, and provided useful information for the subsequent risk evaluation process. 154
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options 6.4 Risks to water quality in the Mannum to Wellington area A total of 184 hazards were identified in the Mannum to Wellington LAP area. The hazards with the highest frequencies were stormwater discharges, flood-irrigated area discharges (predominantly dairy farm), wastewater infrastructure, toilets/septic tanks, wetland/lagoons, and fuel stores (Figure 6.2). Frequency (occurrence) does not necessarily indicate risk—a hazard may have a high frequency but a low risk. The cumulative impacts of low-risk activities will be considered and assessed as part of mitigation strategy development. Number of hazards 25 20 15 10 5 0 Industry Slipway Creek/River Informal Camping Quarry Vessel Waste Disposal Station Animal Husbandry Dredging Site Refuelling Facilities Transport Infrastructure Ferry Figure 6.2 Frequency of hazards to water quality, MW LAP area Landfill Marina Horticulture Petrol Station Vessel Launching/Boat Ramp Vessel Mooring(S) Fuel Store Wetland/Lagoon Toilets/Septic Tanks Wastewater Infrastructure Flood-Irrigated Area Discharge Stormwater Infrastructure 155
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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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