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 3.2 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 39 zones in the BB & LB LAP areas. 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 BB & LB LAP areas: BLRAW001 Berri raw water off-take BLRAW002 Loxton raw water off-take, which also supplies the townships of Noora, Pata and Taplan BLRAW003 Gerard raw water off-take, a private system (ie not SA Water operated) BLRAW004 Moorook raw water off-take (unfiltered) BLRAW005 Barmera–Cobdogla raw water off-take, which supplies the townships of Cobdogla and Barmera BLRAW006 Kingston-on-Murray raw water off-take (unfiltered). Recreation zones Nine recreation zones were identified in the BB & LB LAP areas: BLREC001 Berri and surrounds (9.8 km long) BLREC002 Salt Creek discharge to Ajax Achilles Lake (2.5 km long) RLREC003 Lock 4 (Bookpurnong) to Clarky’s (north) camping area (5.7 km long) BLREC004 Rilli Reach camping area to Clarky’s (south) (4.3 km long) BLREC005 Rilli Island and downstream (4.5 km long) BLREC006 Loxton and surrounds (8 km long) BLREC007 Forby’s Island (downstream of Pyap) (0.4 km long) BLREC008 Yatco lagoon discharge to Kingston-on-Murray (16.4 km long) BLREC009 Overland Corner and surrounds (6.9 km long). 3.3 Hazard identification process A community consultation workshop was held with representatives from the Berri–Barmera and Loxton–Bookpurnong LAP office, Berri Barmera and Loxton Waikerie local councils, Riverland Tourism Association, Central Irrigation Trust, DWLBC, Murray Darling Association and Overland Corner wetland programs. 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. 52
River Murray and Lower Lakes catchment risk assessment for water quality: Results and management options 3.4 Risks to water quality in the Berri–Barmera and Loxton–Bookpurnong areas A total of 143 hazards were identified in the BB & LB LAP areas. The highest frequency hazards were informal camping areas (no sanitation facilities), horticulture drainage, wastewater infrastructure (eg STEDS pumps), vessel launching facilities (boat ramps), toilets/septic tanks, and vessel moorings (Figure 3.2). 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 30 25 20 15 10 Figure 3.2 Frequency of hazards to water quality, BB & LB LAP areas Risks to aquatic ecosystem health 5 0 Fuel Store Slipway Marina Quarry Animal Husbandry Industry Landfill Vessel Waste Disposal Station Petrol Station Figure 3.3 is the key map for the risks to the aquatic ecosystem environmental value in the BB & LB LAP area. The attached CD has individual maps numbered according to the key map. The summary of identified risks to aquatic ecosystem health for the various water quality stressors (Table 3.1) shows that nutrients have the highest frequency, followed by organic matter, turbidity, hydrocarbons and salinity. Most of the risks were rated as low (233) or moderate (174), but a number of high-level (12) risks were recorded. Transport Infrastructure Wetland/Lagoon Creek/River Stormwater Infrastructure Drainage Disposal Site Vessel Mooring(S) Toilets/Septic Tanks Vessel Launching/Boat Ramp Wastewater Infrastructure Horticulture Informal Camping 53
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The River Murray and Lower Lakes ca
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2 Renmark to border LAP area assessment - EPA - Sa.gov.au

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