system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a large difference in in underwater pressure in a river where the water is potentially deep and swiftly moving?

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Does the water increase in pressure when it goes around a bend?  Or does the water act like rush hour traffic and bumper to bumper its way around?  Also taking into account the weight of the water above it.  I know water does not compress, but I would assume the mass of the water would put some force on itself around a turn. I am also wondering about friction, would the water in the middle of a river be moving faster than the water along shore? If so does that mean there are essentially currents in the river so some is moving faster than the other?  If the water is moving faster around a bend does that increase its erosion potential due to faster flow, or higher pressure from depth or inertia?

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I know this is way more than one question that I am asking but the more I thought about it the more questions I had.

What triggered this rabbit hole was a curiosity about flash floods and how the initial debris field looks like a bulldozer.  I was curious about how powerful the water is and how much soil it has the potential to cleave out from the landscape.  I enjoy farming and I know here in Northern California Valley much of our rich soil came from the flooding of the mountain and foothill areas.

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gpt
Does water pressure increase going around a bend-
Yes, slightly, as the centrifugal forces acts on the water in the way it does. 

Water does not compress-
Water does not significantly compress in any meaningful way on a day to day basis, it simply requires incredible amounts of pressure to do so.

Friction at the border-
Yes, this is part and parcel with fluid dynamics, where you take into account this and tons of other data to calculate the ‘flow’ of the fluid.

What makes a flood powerful is that the mass of the water moving against the objects needs to either be translated into torque against things like walls and cars, which leads to them flipping over, or the unprepared load created by the water essentially changing the buoyancy of different parts of the building etc.