A more thorough explanation:

A natural flood channel is a pathway through which floodwaters naturally accumulate and flow downstream. It is formed by the natural bed and banks of a stream or river.

• During heavy rainfall, the natural flood channel in the valley quickly filled with water and prevented flooding in nearby towns.
• The city council decided to build a park along the natural flood channel to provide a green space for the community and reduce the risk of flooding.

These examples illustrate how a natural flood channel can help prevent flooding by providing a pathway for excess water to flow away from populated areas. By maintaining and preserving these natural channels, communities can reduce the risk of damage from floods.