General Contractor Practice Exam

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Which method is least effective for supporting a high water table during construction?

Excavation
Wellpoint pumping
Dewatering pumps
Surface ditches

The correct answer is: Excavation

Excavation is least effective for supporting a high water table during construction because this method involves removing soil from the site, which can lead to increased instability and may exacerbate groundwater issues rather than control them. When excavation is carried out in an area with a high water table, it creates an open cavity that can fill with water, leading to flooding or soil erosion. In contrast, techniques like wellpoint pumping, dewatering pumps, and surface ditches are specifically designed to manage and lower groundwater levels. Wellpoint pumping and dewatering pumps actively remove water from the construction site, effectively controlling the water table. Surface ditches can redirect surface water away from the work area, preventing excess water accumulation. Therefore, these methods are more suitable for maintaining construction conditions when dealing with a high water table.