A roadway with a rough asphalt pavement has a cross slope of 2.5%, a longitudinal
slope of 1.5%, a curb height of 15 cm, and a 90 cm wide concrete gutter. If the gutter
flow is 0.090 m3/s, determine the length of an 11 cm high curb inlet that is required to
remove all the gutter flow. Consider the case where there is an inlet depression of 30
mm over a width of 70 cm.