Point z is to the south of point t.
Single stage well point system of dewatering.
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.
The area to be dewatered is surrounded by number of well points.
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 u is 6m to the east of point t.
Single stage system b.
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.
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.
However eductors ejectors require only a single stage to effect drawdowns of up to 100 feet.
Where excavations are too deep for a single stage wellpoint dewatering system sld pumps and power offer a multi stage rental solution.
The spacing of dewatering system is depends upon nature of soil condition and ground water table.
Point r is 5m to the north of point m.
This method is suitable to soils having coefficient of permeability between 10 2 to 10 4 cm sec.
Minimum spacing is 1m.
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 5 m b 10 m c 15 m d 20 m.
Well point assemblies made up of a well point screen riser pipe and swing joint with tuning are generally installed by jetting.
3 well point systems a.
Sld s wellpoint dewatering systems have the ability to deal with very low flows in silty sands to much larger flows in coarse sands and gravel.
The single stage well point system of dewatering an excavation can be used if the depth of excavation does not exceed a.
Point r lies on the line formed by joining.
Multible stage system c vacuum system 4 chemical grouting 5.
Multistage well point system these systems are used if excavation exceeds 4 5 m and there is a chance of slope failure.
This is preferable over a multi stage well point system.
