Question

A transmission pipeline that conveys water from an upstream reservoir to a downstream reservoir is indicated below. The transmission main has a valve along its length that controls the discharge in the system. The discharge through the valve is computed with the valve equation below. The pipeline has a length of 4,500 m, a Hazen-Williams 'C' factor of 110, and an inner diameter of 450 mm. The upstream reservoir has a water level of 105 m. The valve discharge constant is Es = 0.33 m^5/2 /s. where Q = discharge (m3/s), Es = valve discharge constant (m^5/2/s),Hu/s = upstream head, Hd/s = downstream head. a) When the valve is partially closed (T-value is equal to 0.75), calculate the hydraulic grade line in the downstream reservoir. b) When the valve is closed further, the T value is lowered to T = 0.22. If the water level in the downstream reservoir remains fixed at the level computed in b), compute the discharge in the transmission pipelinee the discharge in the transmission pipeline.

2. A transmission pipeline that conveys water from an upstream reservoir to a downstream reservoir is indicated below. The transmission main has a valve along its length that controls the discharge in the system. The discharge through the valve is computed with the valve equation below. The pipeline has a length of 4,500 m, a Hazen-Williams 'C' factor of 110, and an inner diameter of 450 mm. The upstream reservoir has a water level of 102 m. The valve discharge constant is Es 0.33 m5/2/s where Q discharge (m3/s), Es valve discharge constant (m5/2/s), Hu/s - upstream head, Hd/s downstream head a) When the valve is partially closed (T-value is equal to 0.75), calculate the hydraulic grade line in the downstream reservoir b) When the valve is closed further, the T value is lowered to T 0.22. If the water level in the downstream reservoir remains fixed at the level computed in b), compute the discharge in the transmission pipeline. Downstream Reservoir Upstream Reservoir Valve ha = 105 m he 1,000 m - 4,000 m Figure 1. Reservoir-pipe system with valve. 3. An elevated tank with a fixed water level of 71 m supplies water to the distribution n following parameters: L etwork shown in Figure 1. The network has 5 pipes with the factor-117, and ength = 420 m, Hazen-Williams

Answer 1

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