What term describes the volume of water flowing through a section of a river at a given time, measured in cumecs?

What term describes the volume of water flowing through a section of a river at a given time, measured in cumecs?

• A. Flow rate
• B. Discharge
• C. Volume of water
• D. River discharge

Answer: (B)

The concept being tested is the rate at which water passes a cross-section of a river. The standard term for this is discharge, which is the volume of water flowing per unit time—measured in cumecs (cubic metres per second). Discharge is a flow rate: it can be thought of as how much water crosses the section every second, not the total amount stored in the river. It is calculated conceptually as the cross-sectional area of the river multiplied by the average velocity of the flow (Q = A × v), giving units of m^3/s, i.e., cumecs. While similar ideas like “flow rate” describe a rate of flow, discharge is the technical term most commonly used in river hydrology. Saying “river discharge” is just a phrasing of the same idea, but the precise term without the qualifier is the accepted wording.

The concept being tested is the rate at which water passes a cross-section of a river. The standard term for this is discharge, which is the volume of water flowing per unit time—measured in cumecs (cubic metres per second). Discharge is a flow rate: it can be thought of as how much water crosses the section every second, not the total amount stored in the river. It is calculated conceptually as the cross-sectional area of the river multiplied by the average velocity of the flow (Q = A × v), giving units of m^3/s, i.e., cumecs. While similar ideas like “flow rate” describe a rate of flow, discharge is the technical term most commonly used in river hydrology. Saying “river discharge” is just a phrasing of the same idea, but the precise term without the qualifier is the accepted wording.