online_return_period:    Calculation of return period T based on risk R and design life n

INPUT DATA:

Risk R :  

  (fraction of 1)
 [Allowable range: 0.01-0.75]


Design life n :  

  (No. of years)
 [Allowable range: 1-200]


Display full table

Inlet in urban drainage.

Formula:

T = 1/[1 - (1-R)1/n]


Reference


OUTPUT:

Return period T :  0 years


            

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