Peel Inlet and Harvey Estuary System Management Strategy ...

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EPA Report on the Peel-Harvey Progress and Compliance Report, 2003 4
EPA Report on the Peel-Harvey Progress and Compliance Report, 2003 beneficial uses of the system such as direct water contact recreation, fishing, fishery protection, and habitat protection can continue. To date, catchment land-uses have taken place without due regard for the downstream consequences and impacts on the end receiving water body. The environmental quality of the estuaries has been traded off for the benefit of catchment land-uses. This balance needs to be redressed to achieve conservation and sustainable development of the Peel-Harvey System. Adequate protection of the estuaries’ beneficial uses will dictate changes to the amount and types of catchment activities that will be possible” (EPA, 1988, p.1). By 1988, there were sufficient data and modelling results to enable the EPA assessment to express the management target in both descriptive and numerical terms. The latter was expressed in probabilistic terms to take account of the different nutrient loads that would result from wet and dry rainfall years and was important as it would enable the success of the management strategy to be measured and judged over time, including under differing environmental conditions. The descriptive management objectives the EPA set at that time were: i) “At least an acceptable to good level of water quality, defined as moderately nutrient enriched (mesotrophic); ii) A high level of resilience in the system to ensure that massive oxygen depletion does not occur; iii) A large reduction in phosphorus input to the system from the catchment area; iv) A solution, that will preferably show major improvement within five years, to ensure that irreversible damage to the system does not occur; and v) A very high probability that the strategy will succeed both in the short and the long term. Although not environmental in nature, another important consideration is the overall cost - benefit that would result from the system being adequately managed and becoming healthy and resilient” (EPA, 1988, p.10). The target organisms for management at that time were the in-estuary occurrences of a cyanobacterium (blue-green alga) called Nodularia which can “fix” atmospheric nitrogen, and macro-algae. This led to the focus for management being reducing availability of phosphorus as the means of limiting plant growth. The full management strategy consisted of: • constructing the Dawesville Channel as soon as possible; • implementing catchment management measures, to include: - fertiliser management - changes in land-use - control of point sources - continuation of the moratorium on clearing and drainage - preparation and implementation of an integrated catchment management plan to meet the target for phosphorus load reduction specified in the EPA assessment report; • continue weed harvesting; and 5
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Figure 4 - Examples of Nutrient-exp
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• condition and extent of remnant
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g) The moratorium on clearing has h
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) The overall environmental quality
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• Flooding and increased water ve
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g) The foreshores around the estuar
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Fertiliser advice to farmers Peel I
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2.2.1 Integrated catchment manageme
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2.2.5 Fertiliser advice to farmers
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2.3.2.1 Monitor point sources (P1.0
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2.3.2.7 Catchment management succes
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2.5.1 Estuary monitoring and manage
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2.6.3 Stratification (P1.08:2.23) 2
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2.9.1 Weed monitoring, harvesting a
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2.10.2 Dawesville Channel - Aborigi
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2.11.8 Dawesville Channel - impleme
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2.13.2 Liquid waste disposal for ne
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2.15.2 Compliance auditing (M17) 2.
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