Flooding 101: It takes many bad things at once to make a flood

It takes three things to make a spring flood, says the chief water manager for the Mississippi River and its lakes: “Lots of snow, lots of heat, lots of rain.”
So far, Eastern Ontario has the snow. The Mississippi Valley watershed is at record levels as measured by water content of the snow.
The Rideau Valley Conservation Authority reports that “current conditions at several RVCA snow course sites are indicating near record water content amounts in the snow for this time of yea