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

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Wallis Lake Estuary Management Plan 4.5 Sedimentation S.1 Management Area A, B & C Management Objective Conduct dredging operations to achieve safe water depths for boat passage in designated navigation channels Action No S.1.1 S.1.2 Action Conduct a contour study and sediment dynamics modelling analysis of the island/entrance area of the lake Prepare REF/EIA, obtain all relevant approvals and conduct urgent dredging operations in the following prioritised order: 1. Point Road boat ramp 2. northern point of Godwin Island 3. entrance to Pipers Creek 4. bridge end of Breckenridge channel 5. southern point of the entrance to Ohmas Bay 6. north-eastern point of Wallis Island Indicative Priority Responsibilities Progress Cost $70,000 Immediate (B2) GLC, DIPNR $1M High (B3) GLC, DIPNR, Lands, Waterways, DPI Comments It is important that an initial contour study of the lake be conducted prior to any dredging operations so that the rate of infilling can be monitored for future planning and cost/benefit analyses. A sediment dynamics modelling analysis is required in the EIS for the Tern Island sand deposit development (see action S.3.1). However it will also aid in understanding the physical processes responsible for causing erosion/shoaling in the island/entrance area, assisting in future planning of dredging operations. The contour study should ensure that the mud shoal at the end of Wharf Road, Green Point, is adequately monitored to determine if it is encroaching into the designated area for mooring boats or swimming. If this designated area is compromised, dredging of the shoal should be considered. A monitoring program of the shoal will provide a rate of movement/growth that will aid in future planning and budgetary requirements if dredging becomes necessary. The cost of such a monitoring program would be minimal and could be conducted by residents or community groups with GLC guidance. Priority for dredging has been determined in conjunction with Waterways based on the amount of use experienced by the area and if it is a major designated navigation channel or the only access point to a region. 58
Wallis Lake Estuary Management Plan [Plate 4.7: Mud shoal at Green Point] 1 2 3 4 5 6 [Plate 4.8: Sites for urgent dredging operations (action S.1.2)] 59
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13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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