I remember seeing tools like this in the past, used by governments for flood modelling and other activities, but one of the interesting things at the time(not s

I remember seeing tools like this in the past, used by governments for flood modelling and other activities, but one of the interesting things at the time(not sure about now) was that the elevation data wasn't granular enough in some cases water went uphill. Still good for modelling but you needed humans to interpret.