Testing equations for predicting the impact of urbanisation and stormwater detention on regional catchment runoff

Abstract

Equations have recently been published that may be utilised to predict the impact of urbanisation and stormwater detention on regional catchment runoff. The equations only require inputs of a development site’s location and site area, relative to the regional catchment. This technical note describes the application of the equations with examples of their performance in “real world” rainfall conditions. The importance of joint probability analysis is also discussed, with a new modelling module accounting for the spatial distribution of rainfall used to support the accuracy and practicality of the equations for regular use by practitioners.