Single Stage Well Point System Of Dewatering

Where excavations are too deep for a single stage wellpoint dewatering system sld pumps and power offer a multi stage rental solution.

Single stage well point system of dewatering. Point m is 2m to the east of point z. However eductors ejectors require only a single stage to effect drawdowns of up to 100 feet. Multistage well point system these systems are used if excavation exceeds 4 5 m and there is a chance of slope failure. 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. Point u is 6m to the east of point t. 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.

The area to be dewatered is surrounded by number of well points. Minimum spacing is 1m. This method is suitable to soils having coefficient of permeability between 10 2 to 10 4 cm sec. Single stage system b.

Point z is to the south of point t. This is preferable over a multi stage well point system. 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. Point r is 5m to the north of point m.

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. By single stage well point stage method the water table is lowered by about 4 5m. The spacing of dewatering system is depends upon nature of soil condition and ground water table. 3 well point systems a.

Sometimes a single stage well point system is attached with jet eductor pump this system allows dewatering up to 25 to 30 m depth. 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 eductor wells are installed at relatively close spacing.