Two months ago Cedar Rapids had another flood. The Cedar River overflowed and now the citizens of Cedar Rapids are repairing the damage. Many Iowans compare this occurrence with the larger Flood of 2008 in which both the Cedar and Iowa Rivers overflowed and caused what FEMA estimated to be almost 800 million dollars in damage.
It got me to thinking. How do the Iowans (or anyone) truly predict a flood? Sitting here in Brooklyn, I had always thought that you predict a flood from the intensity of the rainfall. Around here if the rain falls hard and nonstop for a few days, it is only natural that the result will be water rushing over the curb, onto the sidewalk and maybe over the surface of the street.
Predicting a real flood is more complicated than that. One must take the river into account as well.
I found a posting