Final answer:
The rate at which runoff flows downstream is called flood discharge. The correct answer is B.
Step-by-step explanation:
The rate at which runoff flows downstream is called flood discharge. It refers to the volume of water moving through a river channel over time. River discharge is influenced by factors such as precipitation patterns, topography, and land use.
The rate at which runoff flows downstream is called the flood discharge. Discharge is the term used to describe the volume of water moving through a river channel over time.
This measurement tells us how much water is passing a certain point in the river, usually in cubic meters per second (m³/s). During periods of heavy rainfall or snowmelt, surface runoff significantly contributes to an increase in river discharge.
Moreover, river discharge is an important factor in understanding the dynamics of river systems and their capacity during flood events. It combines measurements of a river's depth, width, and average velocity of flow to determine how much water is flowing through at any given point. The correct answer is B.