Engineering, 16.04.2020 02:11, zelles9300
A new 1.2-ha suburban residential development is to be drained by a storm sewer that connects to the municipal drainage system. The development is considered mostly of single-family dwellings and is characterized by a Manning roughness coefficient for overland flow of 0.20, an average flow length of 200-ft, and an average slope of 0.7%. Local drainage regulations require the sewer pipe to be sized for the peak runoff resulting from a 10-yr rainfall event and a minimum time of concentration of 5-minutes. The following 10-yr IDF curve describes the site rainfall conditions expressing rainfall intensity, (inch/hour), as a function of storm duration, ( minutes): =315.50.81+ 6.19Estimate (a) the time of concentration for this site using kinematic-wave equation, and (b) the peak runoff rate to be handled by the storm sewe
Answers: 3
⇒ 1280 min
⇒4.185 ff³/s
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