When pumping in or around the saturated soils that exist near the waterline elevation it is important that measures be taken to minimize sediment transportation into a body of water. The FryeFlow dewatering filtration bags are the easiest to use and most economic solution available to ensure that sediment does not leave your jobsite. FryeFlow dewatering bags are sized to meet the discharge rates of most pumps and are available in custom sizes for pumps greater than 6”. These filtration bags are made of a high-strength, high-flow, nonwoven geotextile to allow for maximum clean water flow. The bags retain the sediments that are pumped in and allow filtered water to pass through.
Typical use guide:
- A bed of open graded stone is prepared whose area is greater than that of the Dewatering bag; stone bed is to be reasonably flat, open graded aggregate bed sized appropriately to dewatering bag dimensions.
- First an appropriate number of lifting straps are placed over aggregate bed to facilitate later removal; the dewatering bag is then unfolded on the prepared bed and oriented such that the dewatering bag has aggregate beyond all sides; pump hoses are brought to the dewatering bag
- Additional perimeter control BMP’s are placed on all sides of the stone bed for energy dissipation and to control any secondary sediment movement.
- Hose is then placed into the dewatering bag via the built-in nozzle; connection between bag and hose end to be secured with appropriately sized worm clamp.
- Turn on pump to slightly above the idle position and do NOT increase throttle until a proper filter cake is developed. Once the filter cake is developed increase throttle to desired position and continue dewatering activities
- Dewatering bag is deemed as “full” when it can no longer efficiently filter sediment, or when the rate at which water passes through the filter decreases to impractical levels.
- Repeat as necessary until dewatering applications are complete or as instructed by project engineers/inspectors.
- Dispose of used bags in accordance with local, state, and federal regulations. Disposal may require machinery.