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What Is Dewatering? 4 Methods for Your Construction Site

Dewatering is the process of removing water from a construction site and transporting it to another location. Such as a detention pond or forest, to make the site safe to work on. Dewatering is an essential step in preparing a site for building operations.

You can select from four major dewatering methods: points, sump pumping, eductor wells, and deep wells. No matter whatever method you use, you must observe certain rules and regulations, including permits. That apply to construction dewatering, especially if the water contains contaminants.

The major criteria determining which dewatering method to adopt are the depth of the drawdown and the amount by which the water table must be decreased. Whether your excavation area is superficial or penetrates deep groundwater, this page will help you determine which dewatering method is ideal for your building project. MB Exports is the Best Dewatering Pump Manufacturers in India.

What Is Dewatering?

Dewatering is the process of removing surface or groundwater from a construction site and transporting it to a pond, tank, or other location, depending on local laws, so that development can begin or continue. Although other dewatering procedures are available, evaporation or pumping is the most common method.

Why Is Dewatering Necessary?

Dewatering may be required for a construction site, particularly if the site is located in an area that already has a body of water, is prone to floods, or retains runoff after heavy rainfall. Removing water keeps the work site safe by preventing dirt from turning into slippery mud, providing stability, and promoting erosion management while dewatering activities maintain the site free of delays caused by water damage.

  • You should pump water to help.
  • Promote a safe job site.
  • Prepare the site for construction.
  • Maintain project efficiency.

Dewatering Methods

There are four types of dewatering systems: points, sump pumps, eductor wells, and deep wells. Each dewatering process is better suited for specific excavations and soil types.


A wellpoint dewatering system derives its name from the fact that it consists of small, individual well points set throughout an excavation that link to a central, centrifugal header pipe with a vacuum function. This helps to reduce groundwater levels and establish a stable, dry environment for building operations.

This technique is particularly useful in shallow excavations or on job sites with fine-grained soils and low permeability. It’s an affordable solution that’s simple to install.

Sump pump

Sump pumping is the most basic and cost-effective dewatering method. It collects water in sumps, or pits dug in the drainage area, and then removes it with solids-handling pumps that pump it to a release point.

It is ideal for building projects with shallow excavations, little surface water to remove, and low-permeability soils. Sump pumping can, however, raise the risk of erosion or collapse and produce water with a high total suspended particle content.


The eductor dewatering method employs an at-grade pumping station made up of several tiny wells. The wells are outfitted with nozzles, also known as eductor bodies, that produce a vacuum zone while sucking groundwater in via a foot valve and pipe system.

In addition to being low-maintenance once built and cost-effective, an eductor dewatering system can reach substantial depths and is not restricted by suction lift, making it ideal for deep excavation. It is particularly beneficial in soils with low permeability and where close well spacing or vacuuming is required. It is, however, incapable of handling a large amount of water.

Deep well

A deep well dewatering system lowers groundwater by drilling a sequence of wells, each with a submersible pump. It is a gravity-based system with larger and deeper wells than a wellpoint system. It is frequently utilized to drain water from prior structures that extend beneath the current excavation.

This dewatering method is best suited for jobs that demand huge amounts of groundwater pumping or big drawdowns, although it can manage a variety of excavation depths. It also performs effectively in high-permeability soils.

What to Consider When Choosing a Dewatering Method

When deciding on the optimum dewatering method for your construction project, some of the most essential considerations include soil, budget, amount of water to evacuate, and excavation depth.


The kind of soil at your excavation site will influence which dewatering process is most effective. The soil’s permeability, or the rate at which water flows through it, is particularly essential.

Some dewatering methods, such as sump pumps and eductor wells, are only effective in low-permeability soils, whereas deep well dewatering works best in high-permeability soil. Wellpoint dewatering can treat either permeability.


The cost may influence the dewatering method you use. The most cost-effective method is sump pumping, followed by wellpoint and eductor wells.

While deep well dewatering is typically the most expensive, if it is the best option for your construction project, it is preferable to utilize a less expensive option that may fail to dewater your project site.

Amount of Water

The amount of water and whether it is surface or groundwater determine which dewatering method is best. Sump pumping and eductor dewatering are most effective when there is little water to pump. Wellpoint dewatering works well in shallow aquifers that are 50 feet deep or less. Deep well dewatering is the only method capable of handling large volumes of water.


The depth of your excavation influences the dewatering process. Eductor wells and deep wells are ideal for deep excavations, whereas wellpoint and sump pumping are best suited to small and shallow excavations.

Water Removal Options

What happens to the water once it has been removed from your job site? Depending on your project site, budget, water turbidity, and applicable state and federal legislation, you have several options for storing dewatered water.

A few common removal options include:

  • Detention ponds or basins are artificial bodies of water designed to store runoff. Using these to remove water can help the environment by reducing the spread of pollutants and toxins to other bodies of water. If you utilize this method, make sure to fulfill federal and state regulations for frequent pond and basin inspections.
  • Tanks or boxes can be used to move dewatered water from one location to another, as well as for drainage, solids, sediments, and sludge removal, and wastewater reduction. Make careful to check federal and state restrictions for the water you’re attempting to transport or drain.
  • As the final step in the dewatering process, you can release or redistribute your water to rivers, marshes, or lakes. It is critical, however, that the wastewater be filtered or treated before release, and that you obtain approval from federal and state environmental agencies.

The next time you plan an excavation, ensure your project site is completely prepped for construction by dewatering it. You can’t start moving soil without a safe, stable foundation to dig into. Contact MB Exports as it is the best Dewatering Pump Manufacturers & Suppliers in India.

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