13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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Wallis Lake Estuary Management Plan S.2 Management Area A, C Management Objective Assess and remove excessive sediment build-up at stormwater drain outlets where necessary Action No S.2.1 S.2.2 Action Conduct an assessment of major stormwater drains to determine where sediment build-up is impacting on habitat quality or impeding passage and compromising the safety of waterway users Dredge or excavate sediment build-up at stormwater drains identified above (S.2.1) Indicative Cost $15,000 + staff time Priority Responsibilities Progress Medium (C4) GLC TBD Long-term (D5) GLC Comments Dredging operations or excavation works should not increase the risk to seagrass or other habitat of high conservation value or adversely impact upon water quality. These actions should be conducted in concert with stormwater management and community education programs to reduce sediment loads entering the Lake and the need to conduct dredging operations in the future. [Plate 4.9: Sediment build-up at stormwater outlet in Forster Keys] 60
Wallis Lake Estuary Management Plan Management Objective Consider managing all maintenance dredging activities in Wallis Lake by developing and implementing a Wallis Lake maintenance dredging strategy S.3 Management Area A, B & C Action No S.3.1 S.3.2 S.3.3 S.3.4 Action Continue investigations into the development and operation of a permanent sand deposit area on Tern Island subject to development approval Rehabilitate Godwin and Cockatoo Islands once a permanent sand deposition area is operational Prepare a Wallis Lake maintenance dredging strategy by: • adapting the Wallis Lake oyster lease maintenance dredging protocol to form Chapter 1 • developing protocols for the maintenance of major navigation channels ensuring safe depths for water vessel passage to form Chapter 2, and • developing protocols for the removal of sediment build-up at major stormwater drains to form Chapter 3 Conduct periodic hydro-surveys to monitor the rate of infilling of dredged areas from action S.1.2 Indicative Cost Priority Responsibilities Progress $1 million High (B4) GLC, DIPNR, EIS completed (Webb, Lands McKeown and Associates 2004) $350,000 High (B3) GLC, DIPNR, Lands $40,000 Medium (B5) GLC, DIPNR, Lands $20,000 Medium (B5) DIPNR Comments The Tern Island project is a problem solving and not a profit making exercise. Any surplus funds arising from the operation of the project will be reinvested into the environmental maintenance of the estuary. Maintenance dredging of oyster leases undertaken in accordance with the Wallis Lake oyster lease maintenance dredging protocol requires consent from one authority (GLC) due to a recent amendment to the EP&A Regulation 2000 under the EP&A Act 1979. S.3.2 will involve removing excess sand that has been dredged up onto Cockatoo and Godwin Islands and rehabilitating the wetlands on these islands. Protocols for the maintenance of navigation channels and stormwater drains should include criteria that must be met to be eligible for the strategy. These criteria must consider sediment stability, cost/benefit, habitat value, navigation and public safety issues. For navigation channels, these criteria may determine the number of times within 6 months a set minimum depth is breached at high tide. A 6-month time frame is a reasonable time frame to wait for the occurrence of a flood event to naturally scour the channel. The depth the channel is to be dredged should be determined after consultation with the various user groups to ensure equitable access. All dredging undertaken in the Wallis Lake maintenance dredging strategy should ensure that dredging operations do not increase the risk to seagrass, mangrove, saltmarsh or other areas of high conservation value or adversely impact upon water quality and should consider any possible adverse impacts upon recreational and commercial fishing activities. 61
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13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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