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 correct answer is: A. 5 m

A single-stage well point system is a type of dewatering system that uses well points to remove groundwater from an excavation. Well points are small, perforated pipes that are installed in the ground and connected to a vacuum pump. The pump creates a vacuum in the well points, which draws the groundwater up and out of the excavation.

Single-stage well point systems are typically used for excavations that are less than 5 meters deep. For deeper excavations, a multi-stage well point system or a deep well system may be necessary.

Here is a brief explanation

• Option A: 5 m. A single-stage well point system is typically used for excavations that are less than 5 meters deep.
• Option B: 10 m. A multi-stage well point system or a deep well system may be necessary for excavations that are deeper than 5 meters.
• Option
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  C: 15 m. A multi-stage well point system or a deep well system may be necessary for excavations that are deeper than 10 meters.
• Option D: 20 m. A deep well system is typically used for excavations that are deeper than 20 meters.