Wellpoint dewatering also known as spear point is an effective dewatering technique.
Well point dewatering procedure.
Wellpoint method of dewatering excavations 1 a series of wells of required depth are created in the vicinity of the excavated area from where the water has to be pumped out.
Procedure of well point system.
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 is widely used for excavations of shallow depths especially for pipeline trench excavations.
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.
In appropriate ground conditions a wellpoint system can be installed speedily and made operational rapidly.
The ground water table is influenced by means of drawing it down through the well points spears that are installed around the excavation area.