The deepest part of a river channel depends on several factors, primarily the speed of the water, the resistence of the bedrock and the volume of flow.
In general, rivers will be deeper upstream, when the water runs straighter and has greater erosion power. However, if the river depends on many tributaries, the lower waters have much greater volume.
The areas near the banks are usually comparatively shallow, since material keeps eroding into the river; however, where the river makes a pronounced curve, the water on the outside of the curve is likely to be deeper than on the inside. The reason again is that there the water flows faster.
A limited deep area is often found just beyond the base of a cataract or waterfall.
..decreasing from top to bot..
..decreasing from top to bot..
Steepest Road in the UK, Ffordd Penllech, Harlech
18cm/km
A river beginning high up in the mountains will fall sharply until the gradient levels out in the valleys. A river beginning in lower hills will naturally have a less steep gradient over all. Therefore, each river's longitudinal gradient will be different and there is no definitive answer.
Obviously rivers must flow downhill. The type of terrain it flows through will always vary. The river is always at its steepest descent in mountainous areas, and of course, that's where the rainfall is highest.
Baldwin Street in New Zealand holds the Guinness World Record for the steepest street. It has a gradient of 35% at its steepest point, making it quite a challenging climb for visitors.
An object that is placed vertically on a plane will have the steepest pressure gradient. Placing an object on an inclined plane will reduce the pressure it applies downwards.
Danube river gradient
In a typical stream where the gradient is steep the discharge is small.
In a typical stream where the gradient is steep the discharge is small.
I think it is regent street in the Dowlais area of the town.