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Florida Erosion and Sediment Control Inspector's Manual ■, <br /> skirt depth . <br /> 7 . Turbidity curtains should be located parallel to the . direction of flow of a moving body of <br /> water. Turbidity curtains should not be placed across the main flow of a significant body <br /> of moving water. <br /> 8 . When sizing the length of the floating curtain , allow an additional 10 - 20 % variance <br /> straight line measurements . This will allow for measuring errors , make installing easier <br /> and reduce stress from potential wave action during high winds . <br /> 9 . An attempt should be made to avoid an excessive number of joints in the curtain ; a <br /> minimum continuous span of 50 feet ( 15 m ) between joints is a good "rule of thumb . " <br /> 10 . For stability reasons , a maximum span of 100 feet (30 m ) between anchor or stake <br /> locations is also a good rule to follow. <br /> .r <br /> 11 . The ends of the curtain , both floating upper and weighted lower, should extend well up <br /> into the shoreline , especially if high water conditions are expected . The ends should be <br /> secured firmly to the shoreline to fully enclose the area where sediment may enter the <br /> water. <br /> 12 . When there is a specific need to extend the curtain to the bottom of the watercourse in <br /> tidal or moving water conditions , a heavy woven pervious filter fabric may be <br /> substituted for the normally recommended impervious geotextile . This creates a <br /> "flow-through" medium which significantly reduces the pressure on the curtain and will <br /> help to keep it in the same relative location and shape during the rise and fall of tidal <br /> waters . .► <br /> 13 . Typical alignments of turbidity curtains can be seen in Plate 4 .45c. The number a <br /> spacing of external anchors may vary depending on current velocities and potential wind <br /> and wave action ; manufacturer's recommendations should be followed . <br /> 14 . Be certain that the type , location , and installation of the barrier is as shown on the <br /> approved plan and permit. Additional permits may be required in navigable waterways , <br /> especially when the barrier creates an obstruction . <br /> .r <br /> 4- 118 <br /> rr <br />