Dewatering

Definition

Dewatering is the process of removing rainwater or groundwater from an excavated area before construction can begin. This involves using pumps, wellpoints, or drainage systems to remove water from the ground or excavations.

Purpose

The purpose of dewatering is to create a dry and stable work environment for construction activities. By removing excess water, dewatering prevents water-related delays, reduces the risk of soil instability and erosion, and ensures the safety and efficiency of the construction process.

Examples of Use

1. Foundation Construction: Dewatering an excavated site for a building foundation to prevent water accumulation and provide a stable base for construction.
2. Pipeline Installation: Removing groundwater from trench excavations to create dry conditions for installing pipes.
3. Mining Operations: Dewatering mine shafts to allow safe access and prevent flooding during mineral extraction.

Related Terms

• Wellpoint System: A dewatering method involving a series of small-diameter wells connected to a pump to remove groundwater.
• Sump Pump: A pump used to remove accumulated water from a sump pit or other collection area.
• Groundwater Control: Techniques and systems used to manage and control the presence of groundwater at construction sites.

Notes

• Dewatering methods should be chosen based on site conditions, including soil type, water table level, and the extent of excavation.
• Environmental regulations may govern dewatering activities, particularly regarding the discharge of water into nearby water bodies.
• Proper planning and execution of dewatering can significantly impact the success and timeline of a construction project.