Final answer:
Stream discharge is calculated using the volume of water that flows over time, represented by the formula Q = A * v, where Q is the discharge, A is the cross-sectional area, and v is the average velocity. Option B
Step-by-step explanation:
The correct answer to what is used to calculate a stream's discharge is B. the volume of water that flows over time. Discharge is a term used in hydrology to describe the volume of water that moves through a river channel over a period of time. The formula to calculate river discharge is Q = A * v, where Q is the discharge, A is the cross-sectional area of the river, and v is the magnitude of the average velocity of the water flow.
Understanding the concept of discharge is crucial since it affects both the flow rate and the velocity of a river. Higher discharge rates can lead to more erosion, sediment transport, and can dictate the shape a river or stream takes as it moves towards larger bodies of water. option B