Which of the following is NOT a type of pre-draining and dewatering system?

A sump hole is primarily used for collecting water, rather than as a pre-draining or dewatering system. Its main function is to act as a reservoir for water that collects from other sources, helping to prevent flooding in areas like basements.

On the other hand, well point systems, French drains, and surface drainage systems are all designed specifically for draining water from the ground and managing groundwater levels. Well point systems use a series of small diameter wells, and pumps to lower the water table temporarily during construction. French drains utilize gravel and perforated pipes to redirect surface water and groundwater away from a specific area. Surface drainage focuses on managing water runoff on the surface of the ground to prevent pooling and flooding.

Understanding the distinctions between these methods is crucial in construction and site management, as proper drainage strategies can significantly affect the stability and safety of a project.