Which method can a contractor use to prevent water from accumulating in an excavation?

The method of channeling and diverting water is effective in preventing accumulation in an excavation because it directly addresses the source of water infiltration. By creating channels or using ditches to direct water away from the excavation site, contractors can manage surface runoff and groundwater effectively. This proactive approach avoids water pooling, which can compromise the stability of the excavation and create unsafe working conditions.

Other methods, while they might seem practical, do not specifically address the prevention of water accumulation as effectively. Building a fence around the site may help with site security and keeping out unauthorized individuals, but it does not control the water that may enter the excavation area. Filling the excavation with gravel could potentially allow for drainage, but it does not prevent water from entering the site in the first place. Covering the excavation with a tarp could provide temporary protection but may not be reliable during heavy rain or if the tarp does not create a complete seal.

In contrast, channeling and diverting provides a systematic way to manage water, ensuring safety and stability on excavation sites.