While measurement the discharge in a stream it was found that the depth of flow increased at the rate of 90 mm per hour when the discharge at the section was 20 m³/s with a surface width of 25 m. The discharge at a section 800 m upstream at the same time would have been:

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. …