Archived PDH Articles

Archived PDH Articles

The PDH Article Series is a unique opportunity for engineers to earn continuing education credit by reading focused articles written by engineers at Contech Engineered Solutions. These articles are archived but still provide invaluable resources to the engineering community.

Archived PDH Articles

Online quizzes are not available for archived articles. Check with your local governing board to see if reading these articles meets your state's PDH requirements.


The Use of Corrugated Metal Pipe and Structural Plate for Aggregate Tunnel and Conveyor Enclosure Applications

November 2009 : By Jim Noll P.E., Steve Tysl P.E. and Matt Westrich P.E.

Pipe Joints and Critical Performance Requirements

August 2009 : By Darrell Sanders P.E.

Practical Factors and Considerations Related to Culvert Inspection

July 2010 : By Jim Noll P.E. and Bob Frascella P.E.

Rehabilitation and Relining of Culverts

September 2008 : By Jim Noll P.E. and Matt Westrich P.E.

Culvert Hydraulics: Basic Principles

December 2007 : By Philip A. Creamer, P.E.

The Practical Differences in Material Properties of Flexible Pipe Products

December 2010 : By Darrell Sanders P.E. and Andrew Jenkins E.I.

How to Design a Culvert Reline Project

June 2018 : By Hugh B. Mickel P.E. and Mitchell T. Hardert P.E.


Modeling Stormwater Runoff Reduction from Rainwater Harvesting

June 2012 : By Greg Kowalsky BSME and Kathryn Thomason P.E.

Cistern Design Considerations for Large Rainwater Harvesting Systems

September 2011 : By Greg Kowalsky BSME and Kathryn Thomason P.E.

Recommendations for Bioretention Media Qualification

November 2016 : By Mindy Hills, CPSWQ, James Lenhart P.E., D.WRE & Alex Macleod P.E.

Evaluation of Media-Based Stormwater Filtration Systems

April 2018 : By James H. Lenhart P.E., D.WRE; Vaikko Allen; Jeremy Gray

Introduction To Designing Corrugated Metal Pipe (CMP) Stormwater Detention Systems

May 2017 : By Gabe Weaver P.E. and Pat Valentine, EIT

Designing Manufactured Treatment Devices with Maintenance in Mind

September 2020 : By Brynn Laird P.E., Travis Wolfe, and Vaikko Allen, CPSWQ, LEED-AP

The Fundamentals of High-Rate Biofiltration

September 2021 : By Alex Macleod P.E., Mindy Hills, CPSWQ, David Corr, and Vaikko Allen

Bridges and Structures

LRFD Implementation of Shallow Spread Footings for Bridge Structures

August 2012 : By Jim Riseborough P.E. and Steve Tysl P.E

Specifying a Vehicular Prefabricated Steel Truss Bridge

August 2012 : By Dennis L. Gonano P.E. and James g. Bauer

Practical Factors Related to the Inspection, Evaluation and Load Rating of Installed Culverts

October 2012 : By James R. Noll P.E., Mitchel T. Hardert P.E., and Joseph A. Dennis, Jr.

Design Considerations for Pedestrian Truss Bridge Structures

October 2011 : By James G. >Bauer, Steven Herth P.E. and Adam Homelvig P.E.

Design Considerations for Wildlife Crossings

December 2018 : By Timothy Miller, Michael Jambor, and Daniel Wasniak P.E.

Erosion Control

Designing Dam Embankments with Articulating Concrete Block Systems

July 2017 : By Craig Seger, P.E. and Matthew Stovall, P.E.

Geosynthetics in Articulating Concrete Block Section Design

August 2011 : By Matthew Stovall P.E. and Barrie King EIT

Articulated Concrete Block Design

August 2010 : By Bryan N. Scholl, Christopher I. Thornton PhD, P.E., and Barrie King EIT

Registration on is required to access the quizzes. Use the "Sign Up" link in the top right of to register. If you are already registered simply enter your credentials to access the quiz. If you answer at least 80 percent of the questions correctly, you will receive a certificate of completion from the Professional Development Series sponsor and will be awarded 1 professional development hour (equivalent to 0.1 continuing education unit in most states). You can print your certificate immediately after passing the quiz. V1 Media is an Approved Provider through the American Institute of Architects / Continuing Education System (AIA/CES). Provider number: 70118112.

For additional PDH opportunities, consult with your local Contech representative or click here to learn more about Contech’s in house technical presentations.

Note: It is the responsibility of the licensee to determine if this method of continuing education meets his or her governing board(s) of registration’s requirements. Online quizzes are not available for archived articles. Check with your local governing board to see if reading these articles meets your state's PDH requirements.