Which of the following best describes the flow characteristics of non-perennial rivers?

The flow characteristics of non-perennial rivers are best described as intermittent, depending on rainfall. This means that these rivers do not have a continuous flow throughout the year and instead experience periods of increased flow during rainy seasons or after significant precipitation events, followed by periods where they may dry up or have very low flow.

Non-perennial rivers are often influenced by seasonal changes and climatic conditions, making their flow highly variable and reliant on weather patterns. This characteristic differentiates them from perennial rivers, which maintain a consistent flow year-round due to stable water sources such as groundwater or continuous rainfall.

The other options do not accurately capture the nature of non-perennial rivers. Consistent flow throughout the year describes perennial rivers. Being always at full capacity suggests a reliability in flow that is not characteristic of intermittent rivers. Saying they are restricted only to man-made channels implies an artificial configuration, whereas non-perennial rivers can occur naturally in many landscapes, shaped by the local climate and topography.