5) A. (5 points) A roadway with a rough-asphalt pavement has a cross slope of 2.5%,...

 

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5) A. (5 points) 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 flow rate is 0.09 m3/s, determine the length of an 11-cm-high curb inlet that is required to remove all the flow assuming there is no inlet depression. What inlet length would reduce the flow rate by 70%? B. (5 points) An infiltration basin is to retain the first 2.5 cm of runoff from a 20-ha catchment. The area to be used for the infiltration basin is turfed, and the soil has a minimum infiltration rate of 100 mm/h. If the retained runoff is to infiltrate within 36 h, determine the surface area to be set aside for the basin. 5) A. (5 points) 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 flow rate is 0.09 m3/s, determine the length of an 11-cm-high curb inlet that is required to remove all the flow assuming there is no inlet depression. What inlet length would reduce the flow rate by 70%? B. (5 points) An infiltration basin is to retain the first 2.5 cm of runoff from a 20-ha catchment. The area to be used for the infiltration basin is turfed, and the soil has a minimum infiltration rate of 100 mm/h. If the retained runoff is to infiltrate within 36 h, determine the surface area to be set aside for the basin.