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Water engineering QUT tut 5

# Water engineering QUT tut 5 - (supercritical d Alternate...

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ENB378 Water Engineering, 2010 Tutorial Problems 5 1. For channel shown below; a) Assuming the bed slope of the channel is 0.0025, what is the discharge through the channel? (Ans: 115 m 3 /s) b) If the discharge were to be halved, what would be the depth of flow (Ans: 3.843 m) 2. Water flows with a velocity of 1.2 m/s and a depth of 0.6 m in a wide rectangular channel. a) Is the flow subcritical or supercritical? (subcritical) b) Find the alternate depth for the same discharge and specific energy (0.25 m) c) What is the critical depth for this flow? (0.375 m) 3. Water is released from a sluice gate in a rectangular channel 1.5 m wide such that the depth is 0.6 m and the velocity is 4.5 m/s. a) What is the critical depth for this specific energy? (1.089 m) b) The critical depth for this discharge? (0.906 m) c) The type of flow?

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Unformatted text preview: (supercritical) d) Alternate depth? (1.458) 4. A rectangular channel 2 m wide carries 2 m 3 /s of water in subcritical uniform flow at a depth of 0.8 m. A frictionless hump is to be installed across the bed. Find the critical hump height? (0.179 m) 30 m 3 m 20 m n = 0.05 n = 0.025 n = 0.10 .5 m 2 1 3m 5. A flow of 1.8 m 3 /s is carried in a rectangular channel 1.6 m wide at a depth of 0.9 m. a) Will critical depth occur at a section where a frictionless hump 15 cm high is installed across the bed? (No) b) Will critical depth occur at a section where a frictionless sidewall constriction (with no hump) reduces the channel width to 1.3 m? (No) c) Will critical depth occur at a section where the hump and sidewall constriction are installed together?...
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Water engineering QUT tut 5 - (supercritical d Alternate...

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