An Improved Rational Method for Urban Runoff Application

In the initial stages of drainage systems planning and for independent tests of advanced runoff model performance there is a need for a simple point flow model. In these cases a method is proposed which is an improved version of the traditional Rational Method. The method, usually regarded as empirical, has a certain relationship with the kinematic wave theory. It is then discussed from both a theoretical and practical point of view based on comparisons with the performance of an advanced continuous model.