What is a wellpoint system primarily used for in excavations?

A wellpoint system is primarily used for dewatering in excavations, particularly in situations where groundwater needs to be controlled to create a dry working environment. This system consists of a series of small-diameter pipes, called wellpoints, which are installed around the excavation site to lower the water table. Pumping water from these wellpoints helps to keep the excavation area free from excess water, allowing for safer and more efficient digging operations.

While other methods can be employed for soil stabilization, mixed soil excavation, or providing support during pipe laying, these tasks do not specifically require the use of a wellpoint system. Dewatering is the key function of this method, making it essential for projects where groundwater could hinder construction activities.