About this course

Wet floodproofing can be defined as permanent or contingent measures applied to a structure and/or its contents that prevent or provide resistance to damage from flooding by allowing floodwater to enter the structure. The basic characteristic that distinguishes wet floodproofing from dry floodproofing is that it allows internal flooding of a structure as opposed to providing essentially watertight protection.

Flooding of a structure’s interior is intended to counteract hydrostatic pressure on the walls, floors, and supports of the structure by equalizing interior and exterior water levels during a flood. Inundation also reduces the danger of buoyancy from hydrostatic uplift forces. Such measures may require alteration of a structure’s design and construction, use of flood-resistant materials, adjustment of building operations and maintenance procedures, relocation and modification of equipment and contents, and emergency preparedness for actions that require human intervention.

This course is based on the FEMA publication, Engineering Principles and Practices for Retrofitting Flood-Prone Residential Structures, Chapter 5 Wet Floodproofing. The techniques and methodologies described in this course document are applicable to most areas in the United States.

Better understand the principles of protecting a structure from flooding
Know how to use the design flood elevation (DFE) in floodproofing design
Be introduced to designing openings for intentional flooding of enclosed areas below the DFE
Understand the use of flood-resistant materials
Understand the adjustment of building operations and maintenance procedures
Understand the need to emergency preparedness for actions requiring human intervention

Intended Audience: This course is intended for Geotechnical, Civil, Environmental, Water Resources, and other engineers whose job description requires a general knowledge of procedures used to wet floodproof homes and other structures.

Publication Source: US FEMA

2 hours
Certificate of completion
Beginner level
No prerequisites
No preparation required
1 year access


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1 Text
1 Quiz
2 hours
Section 1.
Study Guide
Section 2.
WFS Quiz
10 questions
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Cadistics Courseware / INSTRUCTOR
Engineering Marketplace Coordinator

Cadistics is an engineering content development company offering quality courseware in a wide variety of engineering disciplines. With a library of over 400 course titles available, topics include: civil, mechanical, environmental, powergen and renewables, structural, transportation, geotechnical and earth sciences, biological, land development, ethics, HSW, water resources, and more. Cadistics offers a Board of highly qualified Instructors, available anytime to interact with the student on all subject matter offered. Instructors come from a variety of backgrounds in public, and private sectors of engineering academia and practice. Visit us at: to view our credentials.

D. Allen Hughes, PE / AUTHOR

Mr. Hughes is a graduate of the University of Tennessee with BS and MS degrees in civil engineering. He is a licensed Professional Engineer in NC, FL, GA and VA. He is also licensed as a Certified BMP inspector in North Carolina. Mr. Hughes began his engineering career in 1992, when he was employed by S&ME. In 1997 he established the geotechnical engineering firm Piedmont Geotechnical, Inc., PA, which he has managed since then. In 2006 he established D. Allen Hughes Engineering, Inc., which he also managed since then. Since then he has gained significant experience in the analysis, design, investigation, and testing of subsurface conditions, special inspections, BMP inspections, and residential and commercial 3rd party inspections.