What determines transit time on the river? Lots of factors, that include current, tides and displacement

Today we'll talk a little about a somewhat mindboggling topic: what happens when a ship goes by... it's connected to transit time, how long it takes a ship to get from one place to another. Massive ships move lots of water when they travel, and ships here are up against heavy current and tidal influences. We'll talk about what defines transit time of the river.