**1. Introduction**

An expression of nature when excess rainfall flows through the floodplain, flooding is a problem our ancestors, who started civilization had already dealt with. And now, even in our modern times, it is still a world-wide problem that seems to be a worsening problem due to increasing population, and hence, of urbanization that is usually leading to unsustainable development. Moreover, climate change makes the problem more intense as extreme precipitation, rainfall, in particular, near the equator is observed and projected to increase by researchers from the Intergovernmental Panel on Climate Change (IPCC) [1]. To be able to manage our watersheds, we have to understand it. Knowing how our rivers behave will give mankind a harmonious existence with the rest of the environment.
