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2009-323A
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2009-323A
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Last modified
3/17/2016 1:36:04 PM
Creation date
10/1/2015 12:58:28 AM
Metadata
Fields
Template:
Official Documents
Official Document Type
Certificate
Approved Date
12/15/2009
Control Number
2009-323A
Agenda Item Number
8.D.
Entity Name
Florida Inland Navigation District
Subject
Dredged Material Exhibit B
Supplemental fields
SmeadsoftID
7963
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repositioned as dictated by the deposition pattern , can effectively distribute the coarse sediment over the basin <br /> floor. A flow-splitter or a spoon to break the jet' s momentum will also help the single inlet distribute the <br /> slurry. Regardless of the inlet design or operation , maintenance of optimal basin performance will require <br /> regrading the dewatered sediment to reestablish the initial uniform slope of about 0 . 2% ( Section 2 .2 . 2) from <br /> inlet to weir before each successive placement operation . <br /> Preliminary analysis of the settling characteristics of the dredged material to be placed in the IR- 14 <br /> containment basin (Section 2 . 3 . 3 ) indicates that the available distance between inlet and weirs will afford <br /> adequate solids retention. Moving the inlet for more even material distribution must not significantly reduce <br /> this separation distance without additional precautions. To ensure continued compliance with water quality <br /> standards, these additional precautions may include increasing the ponding depth or installing turbidity <br /> screens surrounding the weirs . <br /> 2. 3. 2 Weirs <br /> The IR- 14 facility will use weirs to control the release of the clarified surface layer of the water <br /> ponded within the containment basin . Adjustment of weir height controls ponding depth within the <br /> containment basin which in turn controls basin retention time. Weir height and ponding depth are discussed <br /> in more detail in the next section . However, several additional aspects of weir design affect the flow of water <br /> inside the basin and thereby strongly influence the efficiency of solids retention and the quality of effluent <br /> released from the site . These include weir crest width, weir crest length , weir type, and the location of the <br /> weir within the containment basin . Each of these design aspects and its effect on basin efficiency is discussed <br /> in the following paragraphs . <br /> The first two weir design parameters, weir crest width and weir crest length, affect weir <br /> performance by determining its withdrawal depth. The withdrawal depth lithe depth at which gravity forces <br /> on suspended sediment particles exceed the inertial forces associated with flow over the weir. It therefore <br /> represents the depth of the surface layer of ponded water that is drawn over the weir crest and released from <br /> the containment basin . Maintaining the withdrawal depth less than the ponding depth reduces the possibility <br /> of resuspending sediment which has settled out of the upper water column . Moreover, since the <br /> concentration of suspended sediment increases with depth, minimizing the depth of the withdrawal layer <br /> 13 <br />
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