Wellpoint dewatering is widely used for excavations of shallow depths especially for pipeline trench excavations.
Well point dewatering procedure.
Water is released at the rate of 20 to 25 liters per second at these well points which causes the soil to be dug and the well point to sink deeper into the ground.
Wellpoint dewatering also known as spear point is an effective dewatering technique.
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.
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.
A typical wellpoint system consists of a series of small diameters wells known as wellpoints connected via a header pipe.
Well points are prepared at a distance of about 1m around the area to be excavated.