I finally changed my mind about pre-dredging after a job in Mobile
I used to think pre-dredging was just a waste of time and fuel, figured you could just adjust on the fly if things got thick. Then last month we had a contract in Mobile, Alabama, and the sediment was a nightmare mix of clay and old shell fragments. The older operator on site, Mike, showed me a data sheet from the Army Corps that said pre-dredging with a smaller cutterhead can cut total project time by 18 percent. I actually saw it play out when we tried it on a test section and the main cut went way smoother. He also pulled up a sediment analysis from 2019 that showed how clay compacts if you don't break it up first. Now I'm sold on the idea, but I'm wondering if there's a depth where pre-dredging stops being worth it. Anyone have a rule of thumb for when to skip it?