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The 10-m wide rectangular channel is carrying water at a bed slope of 0.0005. The surface of the channel is a finished concrete surface with Manning's roughness coefficient n = 0.012. The water temperature is 20°C with density 1000kg/m³ and kinematic viscosity 106 m²/s.

a. Determine discharge if the flow is uniform with a depth y = 1 m. b. Some smooth piers (rough cylinders) are installed in the channel to build a small bridge.Determine the drag force that water exerts on a pier with a diameter of 0.2 m. The drag coefficient chart is provided on page 6. c. Is the flow subcritical or supercritical?

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