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r <br /> Chapter 4 = 8est Manta ement Pkaeticesfor. Erosion-and Sediment Controi _. .. <br /> 4,45 FLOATING TURBIDITY BARRIER <br /> Definition <br /> • <br /> bed area <br /> A floating, geotextils matedai which minimizes sediment transport from a distur <br /> adjacent to . or within a. body o# water. <br /> land Pur ose. . <br /> w provide sedimentation os on and protection <br /> ediment controls cannot be used , or from dredging or <br /> where convention <br /> filling within the watercourse. . . <br /> Conditlons Where Practice Ap 1►es <br /> !on: into: the Watercourse where in rus b <br /> Apphcable o actio t esl' and has tbeen atercourses permuted a d subsequ nt sediment movemen s <br /> construction <br /> unavoidable.: . . <br /> Planning Considerations <br /> n of <br /> ment. in time, the <br /> -term suspensio <br /> Soil lossaatsedimentrmay <br /> travel large distances and affectwidesp ead. areas . <br /> turbidity <br /> suspend. . . <br /> curtain enough'Sesidenceaime so that soli pa'rtcd con 'les will fall out�tof suspension . and nod arena ttravel to <br /> r other areas. . . <br /> Turbidity curtain types must be seleote et ; take on the pond , flora tidal watercourse. water <br /> The <br /> +� body, whether it be a flowing channel ; lake, p <br /> specifications , contained within this, practice pertain to minimal and moderate flow <br /> conditions where the velocity of flow. may reach ,5 feet (1 . 5 m) per second (or r-6u current of <br /> approximately 3. knots). .Forsituations where. there are greaterflowwelocities`or currents; a <br /> qualified engineer and product manufacturer should be consulted : <br /> vementin channel <br /> ow <br /> M Consideration must also . ns be are not . designed to act asv I en to the direction . of aweter ter lnipoundnie t dams and <br /> situations. Turbidity <br /> cannot be expected to stop the flow of a significant volume of water. They. are designed <br /> and installed to trap sediment, not to half the movement of water itself; Inmost situations, <br /> andjtjuLr� i i curtains should not be installed across channel flaws : <br /> he <br /> olume of water <br /> be made to <br /> In tidal or <br /> contained moving <br /> thin thetcurtain er 0 ato ctaange provisions <br /> Siince the tbottom of theilcu{ain vs weighted and <br /> con <br /> external anchors a.re firequentlyadded , thevolume ofwatercontained within; the curtain will <br /> " . be much greater at high tide addition to allowing s low ti e ng s ackid in he curtain toures must arise and wateken to r <br /> bnt e <br /> curtain from submerging , g. <br /> must be allowed to flow through the curtain if.the curtain is to remain�hldved by s roughly the same <br /> " placpart of the <br /> e and maintain thWSOVen fiiterame pfabric. he. e. fabriy, thisc allows the water to. assgthro through the <br /> curtain-from a_ heavy <br />