Question: Briefly explain how to use the intensity - duration frequency ( IDF ) curve to predict the peak runoff ( Q ) of a watershed

Briefly explain how to use the intensity-duration frequency (IDF) curve to predict the peak runoff (Q) of a watershed for a design storm with a 50-year return period. Clearly state two (2) qualifications or recommendations for the design engineer using your derived peak flow for the design of a culvert under a major highway.

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