3 well point systems a.
Single stage well point system of dewatering.
Point u is 6m to the east of point t.
By single stage well point stage method the water table is lowered by about 4 5m.
Where excavations are too deep for a single stage wellpoint dewatering system sld pumps and power offer a multi stage rental solution.
Minimum spacing is 1m.
In this way the eductor dewatering system design is similar to the array design used for well point dewatering systems.
The spacing of dewatering system is depends upon nature of soil condition and ground water table.
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.
Multible stage system c vacuum system 4 chemical grouting 5.
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.
Multistage well point system these systems are used if excavation exceeds 4 5 m and there is a chance of slope failure.
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.
This method is suitable to soils having coefficient of permeability between 10 2 to 10 4 cm sec.
Point z is to the south of point t.
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.
This is preferable over a multi stage well point system.
The eductor wells are installed at relatively close spacing.
Point r lies on the line formed by joining.
However eductors ejectors require only a single stage to effect drawdowns of up to 100 feet.
Point m is 2m to the east of point z.
Single stage system b.
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 is 5m to the north of point m.
