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QC-ing the QC Equipment

Posted by Dillon Hogan on Tue, Apr 3, 2018

All Systems Go

At Brennan, we utilize hydrographic survey systems to measure progress on all of our dredging projects. These systems typically include a positioning system, such as RTK-GPS, and a multi-beam echo-sounder. The Real Time Kinematic, Global Positioning System, or RTK-GPS, is a precise satellite navigation tool, whereas an echo-sounder is a sonar device for measuring depth. Combining the two allows us to achieve very accurate measurements on the location of the river bottom. We take the data points created during these measurements and create a 3-dimensional model using Hypack® software. By running a survey before we dredge, and then one afterward, we can create two models and compare them to one another. The difference between the two models is the total volume of in-situ yardage that we have removed. Typically, we are paid by the in-situ volume of sediment (in cubic yards) that we remove so it is very important that these measurements are extremely accurate. Therefore, establishing quality control checks on the equipment before we survey is an extremely important step in achieving accurate measurements.

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3 Crucial Steps for Dredging Near Utilities

Posted by Dillon Hogan on Tue, Jan 23, 2018

Dredging around utilities is challenging, and mistakes can be expensive and dangerous. When utilities, such as power lines, natural gas lines or fiber optics, are above ground they can be easily marked, and a plan can be developed to avoid them. However, when these same utilities are underwater, locating them and working around them adds an additional layer of risk for the contractor.

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How to Perform Hydrographic Surveys like a Pro

Posted by Samantha Schmitz on Fri, Sep 18, 2015

            Hydrographic surveys are a very effective way to map the bottom of a river, lake, or other water body.  By using some of the latest technologies a 3-dimensional model can be developed to show contours, obstacles, scour areas, and large debris.  Even in the most turbid conditions, a hydrographic survey done correctly can be very effective. 

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