Point z is to the south of point t.
Single stage well point system of dewatering.
Point u is 6m to the east of point t.
Multistage well point system these systems are used if excavation exceeds 4 5 m and there is a chance of slope failure.
This method is suitable to soils having coefficient of permeability between 10 2 to 10 4 cm sec.
The area to be dewatered is surrounded by number of well points.
The single stage well point system of dewatering an excavation can be used if the depth of excavation does not exceed a 5 m b 10 m c 15 m d 20 m.
By single stage well point stage method the water table is lowered by about 4 5m.
Well point assemblies made up of a well point screen riser pipe and swing joint with tuning are generally installed by jetting.
However eductors ejectors require only a single stage to effect drawdowns of up to 100 feet.
Single stage system b.
This is preferable over a multi stage well point system.
The single stage well point system of dewatering an excavation can be used if the depth of excavation does not exceed a 5 m b 10 m c 15 m d 20 m.
Point r lies on the line formed by joining.
Minimum spacing is 1m.
In case of a multi stage well point system care should be taken that the header of the lowermost stage is not more than 4 m above the excavation bed so.
In this way the eductor dewatering system design is similar to the array design used for well point dewatering systems.
Well point systems a well point system consists of a number of well points spaced along a trench or around an excavation site all connected to a common header which is attached to one or more well point pumps.
The single stage well point system of dewatering an excavation can be used if the depth of excavation does not exceed a.
3 well point systems a.
The eductor wells are installed at relatively close spacing.
Where excavations are too deep for a single stage wellpoint dewatering system sld pumps and power offer a multi stage rental solution.
Sometimes a single stage well point system is attached with jet eductor pump this system allows dewatering up to 25 to 30 m depth.
Point m is 2m to the east of point z.
The spacing of dewatering system is depends upon nature of soil condition and ground water table.
