You are designing a drainage system for a residential site in Atlanta using a 10-year return period. The site has an area of 1 ha, a flow length of 100 m, an average slop of 1%, a Manning's number of 0.25 and Type B soil. Drainage regulations require that the kinematic wave equation be used to calculate the time of concentration. You are allowed to use either the rational method or TR-55 to calculate the peak runoff rate. It is suggested you used a runoff coefficient of 0.4, which is typical for residential sites. What curve number would be required for both the rational method and the TR-55 method to provide the same peak runoff rate?
You are designing a drainage system for a residential site in Atlanta using a 10-year return period. The site has an area of 1 ha, a flow length of 100 m, an average slop of 1%, a Manning's number of 0.25 and Type B soil. Drainage regulations require that the kinematic wave equation be used to calculate the time of concentration. You are allowed to use either the rational method or TR-55 to calculate the peak runoff rate. It is suggested you used a runoff coefficient of 0.4, which is typical for residential sites. What curve number would be required for both the rational method and the TR-55 method to provide the same peak runoff rate?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:You are designing a drainage system for a residential site in Atlanta using a 10-year return
period. The site has an area of 1 ha, a flow length of 100 m, an average slop of 1%, a Manning's
number of 0.25 and Type B soil. Drainage regulations require that the kinematic wave equation
be used to calculate the time of concentration. You are allowed to use either the rational
method or TR-55 to calculate the peak runoff rate. It is suggested you used a runoff coefficient
of 0.4, which is typical for residential sites. What curve number would be required for both the
rational method and the TR-55 method to provide the same peak runoff rate?
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In the depth of runoff equation, shouldn't s=[(1/0.0394)*((1000/CN)-10)] ?
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For step 4, Q( runoff depth), why did you divide by 10000?
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