Wellpoint dewatering also known as spear point is an effective dewatering technique.
Well point dewatering procedure.
A typical wellpoint system consists of a series of small diameters wells known as wellpoints connected via a header pipe.
Wellpoint dewatering is widely used for excavations of shallow depths especially for pipeline trench excavations.
The following procedure is adopted in the well point.
Well points are prepared at a distance of about 1m around the area to be excavated.
The wells are arranged either in a line or a rectangular form where the wellpoints are created at a distance of at least 2m from each other.
The ground water table is influenced by means of drawing it down through the well points spears that are installed around the excavation area.
In appropriate ground conditions a wellpoint system can be installed speedily and made operational rapidly.