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Essay on Sediment Filter

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SEDIMENT FILTER BAGS

Filter Bags may be used to filter water pumped from disturbed areas prior to discharging back into the stream. They may also be used to filter water pumped from the sediment storage areas of sediment basins.

Materials. Filter bags shall be made from non-woven geotextile material sewn with high strength, double stitched “J” type seams. They shall be capable of trapping particles larger than 150 microns.

Construction Requirements. Filter bags shall be installed according to the details shown on in Figure S1 shown on the Dewatering Systems detail sheet.

A suitable means of accessing the bag with machinery required for disposal purposes must be provided. Filter bags shall be replaced when they become ½ full. Spare bags shall be kept available for replacement of those that have failed or are filled.

Bags shall be located in well-vegetated (grassy) areas, and discharges onto stable, erosion resistant areas. Where this is not possible, a geotextile lined flow path shall be provided. Bags shall not be placed on slopes greater than 5%.

Pumping rates vary depending on the size of the filter bag, and the type and amount of sediment discharged to the bag. The pumping rate shall be no greater than 750 gpm or ½ the maximum specified by the manufacturer, whichever is less. The maximum pumping rate shall be approved by the Engineer.

Pump intakes shall be floating and screened.

The pump discharge hose shall be inserted into the bags in the manner specified by the manufacturer and securely clamped.

Filter bags shall be inspected daily. If any problem is detected, pumping shall cease immediately and not resume until the problem is corrected to the satisfaction of the Engineer.

Basis of Payment. Sediment filter bags will not be paid for separately but shall be included in the contract unit price bid for DEWATERING STRUCTURE, at the designated location.

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