Construction dewatering involves the draining of groundwater or surface water from a riverbed, construction site, caisson, or mine shaft by pumping or evaporation. On a construction site, this dewatering may be implemented before subsurface excavation for foundations, shoring or cellar space to lower the water table. This frequently involves the use of submersible "dewatering" pumps, centrifugal ("trash") pumps or eductors, or the application of vacuum to well points.
Dewatering Bags are designed to contain sediment and some oils during dewatering operations. The flow of water through the dewatering bag can vary dramatically according to soil type. Sand typically will flow at the fastest rate, with clay flowing the slowest. Clay also can bind over the fabric in some instances, blocking flow entirely. For cleanup, dewatering bags normally are allowed to dry in place, then are cut open and removed with heavy equipment.
Sludge and Sediment Filter Tubes are used for dredging spoils, lagoon sludge and slurry. These tubes provide an economical and effective way to keep within NPDES Phase II and Clean Water Act compliance, and within TSS permit levels. These are ideal for aquaculture use, composting or site remediation.