A more thorough explanation:

MID-CHANNEL

Mid-channel refers to the equidistant point in the main channel of a river between the well-defined banks on either shore. It is also known as the middle line of the main channel or the middle thread of a river's current.

When a boat is navigating a river, it is important to stay in the mid-channel to avoid running aground or hitting rocks. The mid-channel is the deepest part of the river and provides the safest passage for boats.

During a flood, the mid-channel of a river can become wider as the water level rises and the river's banks overflow. This can cause the river to become more dangerous and unpredictable.

The examples illustrate how the mid-channel is the central point of a river's main channel and is important for navigation and safety. Staying in the mid-channel ensures that boats have enough depth to pass through safely, while avoiding the hazards of shallow water or submerged obstacles. During a flood, the mid-channel can become wider and more turbulent, making it even more important to navigate with caution.