13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...
13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...
13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...
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<strong>Wallis</strong> <strong>Lake</strong> <strong>Estuary</strong> <strong>Management</strong> Plan<br />
4.5 Sedimentation<br />
S.1<br />
<strong>Management</strong> Area A, B & C<br />
<strong>Management</strong> Objective<br />
Conduct dredging operations to achieve safe water depths for boat passage in designated navigation channels<br />
Action<br />
No<br />
S.1.1<br />
S.1.2<br />
Action<br />
Conduct a contour study and sediment dynamics modelling analysis of the<br />
island/entrance area of the lake<br />
Prepare REF/EIA, obtain all relevant approvals and conduct urgent dredging<br />
operations in the following prioritised order:<br />
1. Point Road boat ramp<br />
2. northern point of Godwin Island<br />
3. entrance to Pipers Creek<br />
4. bridge end of Breckenridge channel<br />
5. southern point of the entrance to Ohmas Bay<br />
6. north-eastern point of <strong>Wallis</strong> Island<br />
Indicative Priority Responsibilities Progress<br />
Cost<br />
$70,000 Immediate (B2) GLC, DIPNR<br />
$1M High (B3) GLC, DIPNR,<br />
Lands,<br />
Waterways, DPI<br />
Comments<br />
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<br />
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<br />
understanding the physical processes responsible for causing erosion/shoaling in the island/entrance area, assisting in future planning of dredging operations.<br />
<strong>The</strong> 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<br />
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<br />
movement/growth that will aid in future planning and budgetary requirements if dredging becomes necessary. <strong>The</strong> cost of such a monitoring program would be minimal and could<br />
be conducted by residents or community groups with GLC guidance.<br />
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<br />
or the only access point to a region.<br />
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