construction dewatering and groundwater control pdf

Construction Dewatering And Groundwater Control Pdf

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Published: 22.04.2021

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Dewatering is a term to describe the removal of groundwater or surface water from for example a construction site.

In construction the water is pumped from wells or sumps to temporarily lower the groundwater levels, to allow excavation in dry and stable conditions below natural groundwater level. There is a variety of pumps used for it: submersible pumps , self-priming pumps, borehole pumps, etc. The presence of undesired water in a construction site can lead to safety risks , increased costs and delays to your project.

Therefore, when preparing to excavate the surface or to perform dry site construction work, it is critical to use the right technique to control, manage and remove water. This becomes even more important as the geology and hydrology will vary from location to location.

Construction dewatering methods refer to techniques such as wellpoints, deepwells, bypass and flood control. In wellpoint and deepwells submersible pumps are installed in a drilled well shaft, while in bypass and flood control pumps are placed in the area that needs to be dewatered. Let's review these common techniques. In Wellpoint, wells are drilled around the excavation area with submersible pumps installed in the well shaft.

These pumps are connected to a header pipe allowing the groundwater to be drawn up by the pumps into the Wellpoints and then discharged. In Deepwell, one or several individual wells are drilled, and submersible pumps are placed in each shaft.

The Deepwell technique is best suited for deep excavations where large water volumes need to be discharged. When sewer lines need maintenance, the sewage flow is pumped around the damaged pipe section using dewatering pumps.

The pumps are installed upstream of the maintained pipe section. Flood control refers to all methods used to reduce or prevent harmful effects of flooding from for example storm water and heavy rainfall. Be it construction, tunneling or mine work, site managers need to be prepared for potential site flooding, keeping pumps that can move high volumes of water against low head pressure nearby. The same applies to elevated water levels in channels, that could have a major impact on local communities when roads and houses get flooded.

It is important that municipalities have good flood protection and are prepared to act quickly on these occasions. Tunnel constructions are complex worksites where many variables need to be taken into consideration.

Significant volumes of water from the construction site need to be removed in order to stabilize the ground or prevent flooding of the work area. Tunnel boring machines and drilling equipment require a reliable supply of cooling water, which must be recovered, extracted and treated after use. Tunneling projects require many dewatering pumps on site, ranging from small submersible pumps to very large units for large volume dewatering applications.

For more detailed information, we recommend reading the article Keeping the water where you want it in tunnel construction. Construction site managers need solid economic reasons for purchasing equipment. Our dewatering pumps are designed to meet their expectations, for whatever tough challenges in construction sites, tunnels and mines. The pumps need to be robust with low weight so that you easily can move a pump from one place to another on the back of a truck.

There is no time for time-consuming installations, you just want to plug-and-pump. The choice between drainage- or sludge pumps depends on the media you are going to pump; if there are solids in the water you would use a sludge pump but if you have light abrasives you choose a drainage pump. Should you also need to remove water from a very tight area, a center-line drainage pump is the best option.

Home Applications. Dewatering methods and techniques Construction dewatering techniques. Why it is important to choose the right dewatering methods The presence of undesired water in a construction site can lead to safety risks , increased costs and delays to your project.

Main dewatering techniques Construction dewatering methods refer to techniques such as wellpoints, deepwells, bypass and flood control. Wellpoints In Wellpoint, wells are drilled around the excavation area with submersible pumps installed in the well shaft. Deepwells In Deepwell, one or several individual wells are drilled, and submersible pumps are placed in each shaft.

Bypass dewatering When sewer lines need maintenance, the sewage flow is pumped around the damaged pipe section using dewatering pumps. Flood control Flood control refers to all methods used to reduce or prevent harmful effects of flooding from for example storm water and heavy rainfall. Tunneling dewatering Tunnel constructions are complex worksites where many variables need to be taken into consideration.

Why it is important to choose the right pump equipment Construction site managers need solid economic reasons for purchasing equipment. Sludge pumps. Drainage center-line pumps. Drainage pumps.

Dewatering pumps. Contact us. Sulzer Pumps Wastewater Spain, S. You might be also interested in. Dewatering in construction.

Dewatering in tunneling. Service for dewatering in construction. Add your key words or key phrases here. By approving the Sulzer website privacy and cookie policy you consent to the use of your personal data and cookies. By using the website you also consent to the Sulzer terms of use.

Dewatering in Construction Works

If your office has purchased a registration with the intent of having multiple colleagues participate, GRA will allow you to share the login information with your office colleagues so you may call in from multiple locations. We strive to remain agile based on the current public health situation and desire to support our members in the best ways possible. This GRA webinar will give you an understanding of how groundwater control plays a key part in many construction and tunneling projects. The presentation will discuss groundwater problems that may be encountered in excavations, including running sands, excessive ground loss, base heave and collapse of excavations, resulting in additional costs and time delays. The background to the more commonly used methods of groundwater control and dewatering will be presented, including techniques used for groundwater control by pumping sump pumping, wellpoints, deep wells, ejector wells and for groundwater control by exclusion cut-off walls, grouting, artificial ground freezing. This webinar is intended for anyone working in on below ground engineering projects — hydrogeologists, engineering geologists, civil engineering consultants and contractors. His original background is in contracting and he has direct hands-on experience of many different dewatering techniques.

Learn the most common construction dewatering methodology and a practical approach for estimating flow rates into an excavation. Even when we have a decent understanding of the geology, ground water can lead to excavation instability, project delays, and ultimately increased project costs for both the General Contractor and the Owner. Controlling ground water is a critical factor for construction and can be unexpectedly challenging when water volumes become greater than anticipated at a project site. Dewatering Pumps. Urban Dewatering. Dewatering demands special consideration of both the construction techniques and hydrogeology like no other engineering task. There are a multitude of strategies for approaching projects in different hydrogeologic conditions and there are seemingly endless troubleshooting techniques when groundwater becomes that "unexpected problem".

In the past dozen years, the methods of analyzing and treating groundwater conditions have vastly improved. The Third Edition of Construction Dewatering and Groundwater Control , reflecting the most current technology and practices, is a timely and much-needed overview of this rapidly changing field. Illustrated with hundreds of new figures and photographs and including numerous detailed case histories, the Third Edition of Construction Dewatering and Groundwater Control is a comprehensive and valuable reference for both students and practicing engineers alike. Drawing on real-world experience, the authors lead the reader through all facets of the theory and practice of this fascinating and often complex engineering discipline. Discussion includes:. Construction Dewatering and Groundwater Control is an indispensable tool for all engineering and construction professionals searching for the most up-to-date coverage of groundwater control for various purposes, the modern ways to identify and analyze site-specific situations, and the modern tools available to control them.


Construction Dewatering and Groundwater Control: New Methods and Applications, Third Edition. Author(s). J. Patrick Powers P.E., · Arthur B.


Dewatering and Groundwater Control

Powers, A. Corwin, Paul C. Schmall and W.

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A developer may not need a General Dewatering Permit, if a Stormwater Construction Permit covers the project activity and the developer meets the following conditions:.

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