This is preferable over a multi stage well point system.
Single stage well point system of dewatering.
Point u is 6m to the east of point t.
This method is suitable to soils having coefficient of permeability between 10 2 to 10 4 cm sec.
Multistage well point system these systems are used if excavation exceeds 4 5 m and there is a chance of slope failure.
Minimum spacing is 1m.
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.
By single stage well point stage method the water table is lowered by about 4 5m.
Point m is 2m to the east of point z.
The single stage well point system of dewatering an excavation can be used if the depth of excavation does not exceed a.
However eductors ejectors require only a single stage to effect drawdowns of up to 100 feet.
Well point assemblies made up of a well point screen riser pipe and swing joint with tuning are generally installed by jetting.
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.
3 well point systems a.
Point z is to the south of point t.
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 r is 5m to the north of point m.
The eductor wells are installed at relatively close spacing.
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.
The area to be dewatered is surrounded by number of well points.
Multible stage system c vacuum system 4 chemical grouting 5.
In this way the eductor dewatering system design is similar to the array design used for well point dewatering systems.
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.
