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For my thesis, I model flash floods in urban areas. A book with recommended practices says to use events with a recurrence interval of 30 and 50 years. Regarding the duration of the precipitation event, it says to use a "relevant duration".

Now I'm wondering what "relevant" means, and can't find information so far. What rainfall duration should be used in urban areas, and why? In papers many use 1h events, but there is no explanation for the chosen duration. Sometimes I read 15min, sometimes 6h.

Perhaps someone can give me ideas in what situations what rainfall duration is "relevant".

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  • $\begingroup$ It is the one hundred year and 500 year events that are the problems. $\endgroup$ – blacksmith37 Mar 6 at 16:19
  • $\begingroup$ what rainfall duration would you use for 100 or 500 year events? $\endgroup$ – DGIS Mar 6 at 17:44
  • $\begingroup$ The relevant precipitation is the one that gives a larger flow. From the available precipitation record you should be able to tell which one. $\endgroup$ – Pere Mar 6 at 18:49
  • $\begingroup$ When it recently rained 40 in. in Houston area , I think it was over 3 days. $\endgroup$ – blacksmith37 Mar 7 at 15:32

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