@Kae Man one of the simpler ...
Published by Matthew Garcia, University of Wisconsin - Madison - Post-doctoral Researcher
@Kae Man one of the simpler storm-water models for this purpose (runoff and infiltration basin design) is the US EPA SWMM. You should be able to find a recent version online via Google. However, you do need some rainfall from some source as input. In the US, we have many estimates from our weather service of the 100-year (1% annual likelihood) rainfall, as well as other frequencies of interest, that we use for estimate storm event inputs to SWMM. Even if you just have a storm rainfall total, and some idea of how it was distributed in time (convective, stratiform, mixed event), you can make reasonable estimates of runoff and basin design in SWMM.