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Stormwater metal loading to a well-mixed/stratified estuary (Sydney Estuary, Australia) and management implications

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Abstract

Stormwater modelling indicated an average annual discharge from Sydney estuary catchment of 215,300 mL and loadings of 0.8, 0.5, 1.7, 3.2, 1.1, 3.6 and 17.7 tonnes for As, Cd, Cr, Cu, Ni, Pb and Zn, respectively. Priority for remediation should be given to creeks with high-metal loads in the upper and central estuary, as well as discharging to the western shores of Middle Harbour. Managerial strategies need to target dissolved and particulate metal phases to ensure effective remediation. The proportion of metals discharged under low- (<5 mm rainfall/day), medium- (>5 to <50 mm/day) and high-flow conditions (>50 mm/day) was approximately 10%, 60% and 30% of total loading, respectively. Under high-flow conditions the estuary becomes stratified and most metals are exported to the sea, whereas metals discharged during low-flow may be remediated by infiltration. Effective remediation will depend on the extent to which ‘first-flush’ metals associated with medium-flow conditions can be remediated.

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  1. Environmental Geology Group, School of Geosciences, Sydney University, Sydney, NSW, 2006, Australia

    Gavin F. Birch & L. Rochford

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  1. Gavin F. Birch
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  2. L. Rochford
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Correspondence to Gavin F. Birch.

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Birch, G.F., Rochford, L. Stormwater metal loading to a well-mixed/stratified estuary (Sydney Estuary, Australia) and management implications. Environ Monit Assess 169, 531–551 (2010). https://doi.org/10.1007/s10661-009-1195-z

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