Tides have a lot to do with it, winds too. Downbound loaded lakers coming off of Lake Superior have been known to wait west of the Soo locks for a strong westerly wind. raises the lake level enough so they don't scrape going through the locks. The tide can be a 2-3 foot change in the course of one day, at least it was on both the bays I lived by (Gulf of Corinth and Tampa Bay) And as another poster explained the Panama canal is there to raise or lower the ships to the level of the lake they cross inland and then back to sea level.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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