Explain how two floods that each having a recurrence interval of 100 years ( probability of .01 of occurring in one given year) can occur in the same river basin three years apart?

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Ipresume the answer is newfoundland as it is closest to the grand banks.