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Dewatering

Extensive dewatering knowledge and experience developing dewatering methodolgies & strategies across Western Australian projects.

INTRODUCTION

Dewatering

Dewatering is the removal of water from solid material or soil, most commonly in the construction industry it occurs from a foundation pit when it is situated below the ground water table. The purpose of dewatering is to keep the excavation dry so that concreting can be done.

The risk and challenges with dewatering is most often related to the management, treatment (where water is contaminated) and disposal of the abstracted groundwater and the corresponding groundwater assessments that are required to ensure dewatering is carried out in a sustainable and environmentally safe manner.

Since groundwater is a vital resource that makind and natural ecosystems heavily rely upon, managing and monitoring groundwater during dewatering activities is essential.



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ENVENG GROUP

So, What do Enveng do?

We design small to large scale dewatering systems specific to your site and groundwater environment for all types of construction projects across Western Australia. Working closely with our supply chain we are able to offer turnkey solutions to reduce scope creep and risk to your project.

Do you need to dewater in the first place?

Our team has extensive experience in construction scheduling and applying engineering solutions to eliminate the need to dewater all together resulting in cost and time savings for our clients.

Upon determining your projects specific dewatering needs, our team can carry out various assessments depending on the stage of your project. During the planning and tendering phases of the Project, Enveng can carry out a risk assumption and cost analysis of dewatering activities likely required, providing your Project with projected environmental risks and costs associated with any dewatering scope on the Project. Then following award and during design and construction stages, Enveng Group execute detailed dewatering assessments by using current and historic groundwater and rainfall data and DWER dewatering calculators.

Managing contamination risks

During the dewatering assessment, we determine the needs around the treatment of abstracted groundwater (if required) and all potential reuse, infiltration, reinjection and other disposal options.

A desktop review of all getoechnical data, detailed site investigations and acid sulfate soil investigations provides us with a overview of the potential groundwater contamination issues. Where dewatering is essential onsite, a detailed water sampling and analysis can be arranged for each site requiring dewatering. The results of these assessments assist Enveng Group with developing effluent treatment strategies and methodologies, design and placement of turkeys nests and infiltration basins, reinjection options and resuse oppportunties specific to the Project.

What about regulatory compliance?

We design and prepare dewatering management strategies for contractors that complies with relevant legislative guidelines including dewatering closure reporting as required by the regulatory framework.

We can prepare detailed monitoring, sampling and reporting requirements and scheduling within your management plan or separately that may be included in your Projects program and budget.

Another important aspect of dewatering that often gets overlooked, is the requirement for Department of Water and Environmental Regulation (DWER) approvals under the Rights in Water and Irrigation Act (1914). These are commonly in the form of a 26D license to "construct wells", a 5C license "to Take water" and Section 11/17/21A permits "to interfere with the bed and banks".

Our team is well versed in preparing and submitting the necessary approval applications in a timely manner. The delay of these approvals can often lead to subsequent program delays. So it is imperative that our team get underway on applications for the various groundwater licenses your Project may need as soon as practicable.

RELEVANT PROJECTS

Perth Stadium Rail

Stephenson Ave

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Bunbury Outer Ring Road

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