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Lesson 11: Rational Method Step 5: Calculating Time of ...
ewrel.fiu.eduThe average velocity in our example is 2.8 feet per second. Now we can calculate the travel time using the following equation: Where: T. t = travel time L = length of shallow concentrated flow in feet V = velocity (in feet per second, from Diagram 1) In our example the length of the shallow concentrated flow is 600 feet.