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Dillon Hogan

Recent Posts

The Science Behind Radial Gate Tensioning

Posted by Dillon Hogan on November 27, 2018

At Brennan, we have worked on many dams of various sizes and functions. As very few new dams are built each year, most of our work consists of rehabilitation and repairs. Dams are built to last for long periods of time, however certain components will require periodic repairs and replacements. For instance, radial gates are some of the most common components that need attention. In our experience, we have found certain best practices that will increase the lifespan of these gates, as well as increase their functionality. 

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7 Cost-Drivers of a Dredging Project

Posted by Dillon Hogan on November 13, 2018

Dredging projects are complex affairs that involve many components and significant planning before execution. The intricacy of these projects means that pricing is often multifaceted. Here are seven common areas that drive overall costs on a dredging project.

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Empowering Individual Safety with Technology

Posted by Dillon Hogan on October 30, 2018

There is nothing more important on a job site than safety. To prevent an injury, one must recognize the potential risk and take corrective action beforehand. The challenge that companies like us face is not so much in trying to figure out how an incident happened, but to condition employees to recognize the potential of injury before it happens. Once that mindset has been ingrained, he or she must then be empowered to address and, or escalate it without repercussion.

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The Basics of Using Polymers on Dredging Projects

Posted by Dillon Hogan on October 16, 2018

Why Add Polymers?

 

One of the biggest challenges on a dredging project is managing the water that is excavated and transported with the sediment. On hydraulic dredging jobs where sediment and water are pumped through a pipeline as a slurry, water can account for 90+ percent of the volumetric flow. After the slurry reaches the disposal area, the water must be separated from the sediment, collected, and often clarified or treated. This process must happen as fast as the water is being pumped, which for a 12-inch cutterhead dredge could be 5,000 gallons per minute.

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3 Critical (and Simple) Steps to Prevent Stray Current Corrosion at Barge Terminals

Posted by Dillon Hogan on October 02, 2018

Stray current corrosion is a common threat to water-based steel structures such as barge terminals. Though hard to identify the source, damage from stray current can be prevented by following 3 simple steps.

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Cofferdams 101: Different Types and Construction Methods on Waterways

Posted by Dillon Hogan on August 21, 2018

Working around water poses a plethora of challenges. There are always two parts of a water-based project, the above and below water sections. Access to the above water section is easy, however when working below the waterline access is not that easy. One of the more apparent issues is what do you do when the water is in the way of your work? One solution is to build a cofferdam.

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Fighting Scour With Articulating Block Mats

Posted by Dillon Hogan on August 07, 2018

Save Money with This Long-term Fix for Scour Problems

Scour poses a large threat to the stability of any structure that is partially or entirely underwater. It may develop slowly over time, or be brought on quickly by an intense rain event or seasonal flooding. In some cases, such as along a shoreline, scour can be very evident. In others, scour can go unnoticed for an extended period of time. Whether it is taking place around the footing of a bridge pier, along the base of a sheet pile wall, or along a tailrace on a dam, scour may not be evident until the structure begins to show signs above the water. At this point, the structure is beginning to fail and repairs must be done soon to avoid a total loss of integrity. Repairing scour and erosion issues that may be going unnoticed in any location is vital as it will save a lot of money in the long run, and extend the life of the structure.

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The 4 Basic Steps of a Wetland Restoration

Posted by Dillon Hogan on July 24, 2018

Our experience in wetland habitat restoration began 30 years ago with the Upper Mississippi River Restoration Program (UMRR), the largest restoration program ever undertaken on a major waterway, worldwide.  Since then we have carried out many more restorations along the inland waters of the United States, including restoration after large-scale environmental remediation.  

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Out of Sight, Out of Mind; The Importance of Underwater Inspections

Posted by Dillon Hogan on July 10, 2018

Lock and Dams, bridges, pipeline crossings, and barge terminals are all examples of water-based infrastructure. Ensuring that these structures maintain their integrity is essential to their continued operation, however water-based infrastructure presents an added challenge because a portion of the structure is underwater.

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The Art of Replacing a Railroad Bridge

Posted by Dillon Hogan on June 26, 2018

Railroads don’t mess around when it comes to infrastructure upgrades. When bridges get replaced, they are often replaced with long-term solutions that will serve the railroad well into the future. Each bridge is a very small piece of an expansive system, however if it has to be taken out of service, the entire line may be shut down. Trains would have to be re-routed, time would be lost, and costs would go up. This is why in an expanse network of rail infrastructure; each bridge is a crucial piece.

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