There are an increasing number of floods in Canada but that may just be from
better reporting. People are also building more on flood-prone lands. May be
caused by climate change.
Floods occur in Canada anywhere, anytime.
They don’t cause many deaths but they are so expensive.
The Red River Floodway is a trench to divert water during flood times.
Normally empty, but necessary to use in the spring every couple of years.
Expanded to handle a 1-in-700 years flood.
Dike: A long artificial mound of earth constructed to hold back water. Not
always built on a riverbed.
Flood Stage: The maximum capacity for a river to not overflow, anything
above this would cause a flood.
Drainage Basin: The land area that contributes water to a river system.
Discharge: The rate of water flow expressed as volume per unit of time.
Load: The amount of sediment waiting to be moved.
Gradient: The slope of the stream bottom
Sinuosity: Length of a stream channel divided by the straight-line distance
between it’s ends
A meandering river cuts into the banks, using its energy to erode and
transport sediment. The water erodes one side then the other. It deposits the
sediment inside a bend where water is shallower and less powerful (called a
Braided Stream: An overloaded stream so full of sediment that water flow is
forced to divide and recombine in a braided pattern.
Run Off: Portion of precipitation that travels across land to reach a stream.
Infiltration: Slow passage of water through