Question: A subdivision in Corvallis, Oregon, is shown in Figure P6.21. Rational method design is performed using the 10 - yr return period IDF curve of

A subdivision in Corvallis, Oregon, is shown in Figure P6.21. Rational method design is performed using the 10 - yr return period IDF curve of the Oregon Department of Transportation (1990) for Zone 8, which may be approximated as follows:

With i in in./hr and tr in minutes. The standard error of estimate is 0.0079 in./hr.

29.8438 84 432.8875 i= 0.2081 +

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