Explain the Rational method of peak runoff estimation. Write its assumptions.

The Rational method is a widely used hydrologic method for estimating the peak discharge of a runoff event in a small to medium-sized drainage basin. The method is based on empirical relationships between peak discharge and drainage basin characteristics, such as the basin area, runoff coefficient, and time of concentration. The Rational method is simple to use, but its limitations and assumptions must be considered when interpreting its results.

Assumptions:

1. The runoff event is short-lived, meaning that it occurs over a relatively short period of time and the discharge rate is relatively constant.
2. The drainage basin is homogeneous, meaning that the rainfall and runoff conditions are the same throughout the basin.
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