How often does a 100 year flood happen

neverThe 100 year flood is called a "100" year flood because it happens every 100 years!

Explanation:

b/c it doset happen it rare

Every 100 years

Explanation:

The 100 year flood is called a "100" year flood because it happens every 100 years!

Hope this Helps!

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is