Abstract
A recent paper (Bachmann et al., 1999) based on analysis of literature data predicts failure for restoration plans implemented by the St. Johns River Water Management District (SJRWMD) for Lake Apopka, a large (125 km2), shallow (mean depth=1.63 m), polymictic lake in central Florida. A marsh flow-way designed to remove particulates from inflowing water from Lake Apopka as a means to improve down-stream and lake-water quality is part of the restoration plan. According to Bachmann et al. (1999), restoration “will be ineffective in removing particles from the lake” and fail because estimated time for removal of 2.21 million tons of historic sediments in this constructed marsh flow-way is 329 years. This inadvertently proposed mining hypothesis given as a condition for successful restoration is based on questionable assumptions, i.e. removing all the historic sediments deposited over a 50-year period with the flow-way and exporting concurrent sedimentation while historic sediments are being removed. These questionable assumptions are used in an erroneous, discontinuous model of sediment dynamics that does not justify the alternate approach for restoration of Lake Apopka suggested in their paper.
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