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INSTRUCTOR:
Douglas D. Gransberg, Ph.D., P.E., F.ASCE
Purpose and Background
Temporary site drainage and the control of groundwater during construction is a topic that is not generally included in most Civil Engineering curricula. Designers are taught to articulate the before and after conditions of the facility being constructed without much technical guidance on how the construction contractor should build the project. While means and methods remain the responsibility of the contractor, failing to understand the cost and schedule impact of temporary drainage and groundwater management can lead to overly optimistic preconstruction cost estimates and unrealistic contract completion dates. Both could lead to a project being delayed because the bids are over the owner’s budget and cannot be awarded as planned. Another unrecognized impact is a reduction in competition as well-qualified contractors decide not to bid because the schedule risk is unacceptable. Lastly, the delays incurred due to the failure to manage both groundwater and surface drainage often lead to claims and litigation.
This seminar will present the construction engineering design of temporary site drainage and dewatering of excavations. It will present a variety of common methods to control drainage and groundwater during construction. While the underlying micro basin hydrological and groundwater flow theory will be included, the seminar will focus on the pragmatic selection of means and methods for common subsurface and surface drainage conditions. Actual case examples will be discussed in the context of the topic being presented.
The seminar will also discuss the geotechnical baseline report in the context of the EJCDC differing site conditions clause. It will discuss common methods for computing delays due to differing conditions. It will also cover the implications of DSC on geotechnical and subsurface risk allocation in design-build contracts.
Benefits and Learning Outcomes
Benefits
- How to evaluate the potential means and methods related to temporary site drainage and groundwater control during the design process
- How to plan and perform an effective geotechnical investigation for dewatering projects
- How to apply micro basin hydrologic analysis to determine quantities of surface drainage that must be controlled
- How to design temporary construction site surface drainage features
- How to design common wellpoint dewatering systems for excavations
- How to integrate groundwater cutoff methods in dewatering
- How to evaluate cost and schedule impact for a differing site conditions claim
- How to prepare subsurface performance specifications for design-build projects
Learning Outcomes
Upon completion of this webinar, you will be able to:
- Explain how micro basin hydrology is used to design temporary site drainage.
- Describe the various options for temporary drainage structures to control surface water.
- List the options for dewatering an excavation.
- Design a wellpoint dewatering system.
- Apply a typical geotechnical baseline report to the analysis of groundwater impact during construction.
- Calculate the schedule impact of a groundwater-related differing site condition.
Assessment of Learning Outcomes
Achievements of the learning outcomes will be assessed by quizzes given throughout the course.
Who Should Attend?
Project Owners, Contractors, Geologists, Civil Engineers, Environmental Engineers, Geotechnical Engineers and Consultants, Construction Managers, and Supervisory Engineers will benefit from this seminar.
Outline
- Introduction
- Micro-basin hydrology
- Temporary construction site drainage analysis and design
- Site investigation planning considerations
- Dewatering analysis
- Selecting appropriate dewatering means and methods
- Groundwater cutoff methods
- Performance specifications
- Differing site condition analysis
How to Earn your CEUs/PDHs
This course is worth 1.4 CEUs /14 PDHs. To receive your certificate of completion, you will need to complete a short post-test and receive a passing score of 70% or higher within 30 days of the course.
How do I convert CEUs to PDHs?
1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]
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