Moving water follows rules. Once you can see them, a river stops being a surface and becomes a set of features you can plan around.
This is an introduction to reading easy moving water. It is not whitewater instruction, and reading about it is no substitute for a course with a qualified instructor.
Water runs fastest on the outside of a bend
The current piles up on the outside, cutting the bank away and running deeper there. The inside of the bend is slower and shallower, and that is where gravel builds up.
This matters because the outside of a bend is where fallen trees collect and where banks undercut. The inside is where you run aground. The line is usually somewhere between the two, closer to the inside than instinct suggests.
The tongue
Where water funnels between obstructions it forms a smooth V pointing downstream. That is the deepest clear route through, and it is generally where you want to be.
A V pointing upstream is the opposite. It is water splitting around something just below the surface. Stay off the point of that V.
Eddies
Behind a rock or a bank projection the water turns and runs back upstream. That pocket of calm is an eddy, and it is the most useful feature on a river.
Eddies are where you stop, wait, look ahead and regroup. Learning to enter and leave one deliberately is the first real river skill worth practising.
The line between the eddy and the main current is where the two are moving in opposite directions. Cross it with commitment and a bit of lean, not tentatively.
Strainers are the hazard that matters
A strainer is anything that lets water through and stops solid objects. Fallen trees, branch piles, willows, fence wire.
They are dangerous because the current keeps pushing while the obstacle holds you. On the small rivers that suit packrafts, strainers cause more trouble than rapids do.
Stay well away. If you are being pushed towards one and cannot avoid it, the accepted advice is to swim aggressively at it and climb up and over rather than let it pull you under.
Other features worth naming
A horizon line, where the water ahead simply disappears from view, means a drop you cannot see. Get out and look before you commit.
A hole or hydraulic forms where water pours over an obstacle and folds back on itself. Small ones are harmless. Larger ones can hold a swimmer or a hull.
A weir is the man-made version, and it is often far more dangerous than it looks from upstream. Portage weirs. Always.
Scout from the bank
If you cannot see through a bend, if the water ahead is doing something you do not understand, or if there is a horizon line, get out and walk down the bank to look.
Scouting costs a few minutes. Not scouting has been the first step in a great many bad afternoons.
Levels change everything
The same stretch at two different flows is two different rivers. Higher water covers rocks but speeds everything up, removes eddies, and pushes you into the trees on the outside of bends. Lower water is slower but exposes obstacles.
A description of a rapid is only true at the level it was written for.
Where a Seeka fits
Seeka packrafts are built for lakes, inlets, estuaries and easy rivers reached on foot. Reading water is what keeps you on the right side of that description.
Fast whitewater calls for a different craft. If a river is asking for whitewater skills, it is asking for a whitewater hull and the training to go with it.
Every Seeka self-bails and carries a two-year warranty on materials and welding. Or hire one for a weekend first.