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 4.2 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 50 zones in the RW LAP area. Raw water supply zones Six raw water supply zones (from 500 m downstream to three kilometres upstream of each potable water off-take) were identified in the RW LAP area: RWRAW001 Woolpunda (unfiltered) RWRAW002 Waikerie township RWRAW003 Cadell (unfiltered) RWRAW004 Cadell Training Centre (unfiltered) RWRAW005 Morgan (township and Morgan–Whyalla pipeline) RWRAW006 Blanchetown (unfiltered). Recreation zones Ten recreation zones were identified in the RW LAP area: RWREC001 Waikerie and surrounds (10.6 km long) RWREC002 upstream of Ramco lagoon (2.2 km long) RWREC003 Ramco Point (1.3 km long) RWREC004 Lock 2 to ‘Old Riversleigh’ (3.6 km long) RWREC005 Hogwash Bend to Wilson’s Sandbar (5.2 km long) RWREC006 Cadell and surrounds (5.0 km long) RWREC007 Morgan to Brenda Park wetland (11.7 km long) RWREC008 Scotts Creek to Murbko Flat (8.3 km long) RWREC009 McBeans Pound shack area to Roonka (3.4 km long) RWREC010 Blanchetown (4.4 km long). 4.3 Hazard identification process A community consultation workshop was held with representatives from the Riverland West LAP office; Loxton Waikerie and Mid Murray local councils; local irrigators and landholders from Cadell, Morgan and Waikerie; and Golden Leisure Houseboats. 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. 4.4 Risks to water quality in the Riverland West area Frequency of hazard types A total of 140 hazards to water quality were identified. Those with the highest frequencies were toilets/septic tank systems, wetlands/lagoons, horticulture, vessel launching/ boat ramps, vessel moorings and informal camping areas (Figure 4.2). 86
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options 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 Chemical Store Landfill Quarry Risks to aquatic ecosystem health Refuelling Facilities Stormwater Infrastructure Animal Husbandry Fuel Store Industry Marina Transport Infrastructure Vessel Waste Disposal Area Drainage Disposal Site Ferry Vessel Waste Disposal Station Grazing Petrol Station Creek/River Wastewater Infrastructure Informal Camping Vessel Mooring(S) Vessel Launching/Boat Ramp Horticulture Figure 4.2 Frequency of hazards to water quality, RW LAP area Wetland/Lagoon Toilets/Septic Tanks Figure 4.3 is the key map for risks to the aquatic ecosystem environmental value in the RW LAP area. The attached CD has individual maps numbered according to the key map. Each hazard was assessed for different water quality risk parameters (eg stormwater may be assessed for nutrients, turbidity, organic material, heavy metals and hydrocarbons). The frequencies of identified risks for water quality parameters are summarised in Table 4.1. The highest frequency of risks was for nutrients and organic matter, followed by turbidity, pesticides, hydrocarbons and salinity. Most of these risks were rated as low (234) or moderate (254) level, but a significant number (16) of high risks were recorded. 87
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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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Current and potential future option
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