What is the purpose of the "Rational Method" in storm water management?

The Rational Method is a widely used approach in storm water management that focuses on estimating the amount of runoff generated from a specific area during a rainfall event. It is particularly effective for small drainage areas and short durations of storms. It takes into account various factors such as rainfall intensity, the area of the site, and the runoff coefficient, which represents how much of the rainfall will contribute to runoff.

The main objective of the Rational Method is to provide a quick calculation of peak runoff rates, allowing designers and engineers to size drainage systems appropriately and ensure that storm water is managed effectively to prevent flooding and erosion. By determining the amount of runoff created in a storm, professionals can make informed decisions about infrastructure design, drainage requirements, and compliance with local regulations regarding storm water management.