If the risk of a flood occurring in the next 10 years is accepted to 10%, then the return period for design should be

- 1
  
  1+(0.9)^0.10
- 2
  
  1-(0.9)^0.10
- 3
  
  1/(1-0.9^0.10)
- 4
  
  1/(1+0.9^0.10)

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