I am working on modeling surface run-off (in ArcGIS 10.2) due to a rain event (e.g., 5 year rain for a duration of 30 mins.) over an approx. area of 30 km2 for which I have a DEM and necessary soil as well as land-cover data (Manning's n values).
I want to build my own model, but in the meantime want to ask if any open-source tool calculates run-off depth at defined time intervals? The final result would be to generate run-off depths at certain time intervals and generate a movie out of it. Would be great if you could share your experiences with the available open-source hydrological models.