Dewatering and sheetpiling division
The main objective in any De-watering exercise is to lower the water table below the working platform and maintain the depressed level economically and efficiently for the duration of the De-watering period.
The sub-strata and its permeability in and around the site will determine which type of De-watering system will be most effective. This, in turn, will allow GEOMAC to formulate the number and size of wells required to reduce the water table for excavation. Positioning may also be conditioned to suit the builder’s construction requirements.
Groundwater management involves strategic positioning of wells to provide a dry working platform and to limit the effects on the groundwater table (GWT) beyond the site.
The depressed water table forms a cone of depression between the natural GWT and the submersible pump. The extent of local reduction in the water table is dependent on the pump depth, capacity and the permeability of the soil. The depressed water table at distance from the natural GWT depicts the De-watering of a typical high-rise site.