If raw water having dynamic viscosity μ=0.001519N⋅s/m2   flows at rate of 30,000 m3/d into a rapid mix tank having hydraulic detention time τ=30s , determine the power input (kW) required to maintain a mixing velocity gradient of 1000 s-1.

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2.10. Water leaves a treatment plant in a 500-mm diameter ductile-iron pipeline at a pressure of 600 kPa and at a flow rate of 0.50 m³/s. If the elevation of the pipeline at the treatment plant is 120 m, estimate the pressure in the pipeline 1 km downstream where the elevation is 100 m. Assess whether the pressure in the pipeline would be sufficient to serve the top floor of a 10-story building (approximately 30 m high).

Calculate the minimum fluidization velocity for an anthracite bed having following characteristics; d90 = 2.9 mm, ?anthracite = 1600 kg/m3, ?water = 998 kg/m3 at 20°C; µ = 1.002x 10-3 kg/m.sec