The importance of dewatering a site before construction has never been debated, and it goes to show just how important it is. Dewatering is often one of the first tasks carried out on a site to prepare it for construction or agriculture in some cases. It involves the removal of excess water from the ground, and it helps to keep the ground dried for a better foundation building.

Different construction companies adopt different dewatering methods for sites. The system to be used often depends on several factors that mostly have to do with the soil condition and how much water is on the site. One commonly utilized method is the wellpoint system, and it has always been very effective, especially when adequately done. This article will consider the different techniques of wellpoint dewatering and how effective they are. Read on for more information.

Wellpoint Dewatering System

Many construction companies adopt the wellpoint system as their primary dewatering method because of its efficiency and simplicity. This system serves as a tool for deep-water removal, and it involves the drilling of several small-diameter wells on the construction site.

The wells are installed using either a water jetting system, auguring technique, or rotary drilling, and pipes are inserted in each well. Each pipe is then connected to a header pipe using small valves, and a dewatering pump is attached to the header pipe. The pump pushes the water from each well into the header pipe that directs the water to a collection point.

Types of Wellpoint Dewatering

There are mainly two types of dewatering via the wellpoint system.

  • Single level wellpoint
  • Multi-level WellPoint
  1. Single Level Wellpoint: The single-level wellpoint involves using perforated riser pipes of around 1m long and 5cm in diameter. The holes are protected with a fine screen to keep debris out, and a jet nozzle is fixed at the end of each pipe. The nozzle functions as a driving point, while valves are also introduced to make the water flow in one direction.
  2. Multi-Level Wellpoint: Also referred to as a multi-stage wellpoint, this system is often adopted when the excavation depth is above 15 feet. In this system, the well points are installed in stages or to different grades until it reaches the desired depth. The riser pipes are then inserted and connected to the header pipe.

Advantages of the Wellpoint Dewatering System

Most construction companies prefer to use the wellpoint system for dewatering sites, except in cases where this system is not the most appropriate. Here are some significant advantages of wellpoint dewatering that have made it very popular.

  • Less expensive than other dewatering methods
  • Very effective
  • Straightforward dewatering system
  • Ideal for deep water removal
  • Suitable for many projects, including:
    • Deep sewer lines laying
    • Canal construction
    • Bridge construction
    • Subway construction
    • Water distribution
    • Residential buildings

Bottom Line

The wellpoint dewatering system has proven to be one of the best methods for removing groundwater, and the different techniques in this system make it more versatile.

The types, advantages, and applications of the wellpoint dewatering system have been highlighted in this article. This is to help you understand the concept better for more suitable and effective constructions. It’s important to note that all dewatering services must always use the finest quality dewatering hire equipment.