River flood plains

[eranimo]

Each cell edge has a property called "flow". It's currently determined by the equation: m^2 where m is the moisture at that edge point.

We want to determine what areas next to rivers are flood plains. We can do this by using monthly moisture to calculate a "monthly flow" value. Calculate the yearly average flow value for each edge. We can say that a river is flooding when the monthly flow is over the yearly average.

We also should take into account the height differential. In real life, rivers with a low height differential have a large flood plain, while rivers with a high height differential erode more.

Sources:

https://en.wikipedia.org/wiki/River#Classification