Question: Use the alternating block ( balanced triangular ) method with a 5 - minute time step to derive the 1 0 - year, 1 -

Use the alternating block (balanced triangular) method with a 5-minute time step to derive the 10-year, 1-hour design storm for a watershed in St. Louis, Missouri. The IDF relationship for 10-year storm events in St. Louis is approximated by i=(104.7/(t^0.89+9.4))

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