What is the calculation called for a series of hypothetical water levels in an impoundment and their corresponding discharge through an orifice?

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The calculation for a series of hypothetical water levels in an impoundment and their corresponding discharge through an orifice is called a discharge rating. This rating is usually displayed on a graph or table, known as a rating curve, which can be used to predict the flow rate for a given water level. Single-stage outlet refers to an outlet structure with only one level of discharge, impoundment is the act of storing water in a reservoir or pond, and a berm is a barrier used to contain water.

What Is the Calculation Called for a Series of Hypothetical