Intro to Open Channel Hydraulics

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Open ChannelHydraulics

Dr. SM ShiraziF.JSPS, M.IWA, M.ASCE

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What is Water?

• 2 molecules H + 1 molecule O2

  H2

O

• Scientific Name : Dihydrogen Monoxide

•

 At ambient temperature, can exist invarious forms

• Pure water is tasteless, odourless, and

colourless

• Liquid state water 

• Solid state ice

• Gaseous state water vapour 

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H2O

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 Water is most dense at 4ºC

Ice

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What is hydraulics?The study of water or other fluids at

rest or in motion, especially with

respect to engineering applicationsExample

Irrigation systems

Water supply systems Groundwater Systems

Marine structures

Flood mitigation systems Power generation (from water)

Water treatment systems etc.

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How has been classified? Hydraulics as

Flow in open channel (rivers, streams

etc.)

Flow in closed channel (Pipe flow)

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Open channel is a conduit in which

water flows with a free or open surface. A channel may be natural (Channel) or

artificial (Canal)

Artificial channel under various

circumstances in practice may be called

as,

Canal

Flume

Chute Drop

Culvert

Tunnel

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Open channel hydraulics Why does the flow in rivers vary from deep

and tranquil to shallow and torrential?

What controls the depth of water in a river?

How are water depth and discharge in astream related?

How does the velocity in a stream change asthe amount of water carried by the streamincreases?

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Course Outcome

1) Identify different types of flows

and determine the flow profile

2) Design economically mostefficient channels and canal

section3) Employ dimensional analysis

and its application in hydraulics4) Analyze the flood propagation

through regular channel

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Course Evaluation

Class Quiz: 5

Mid term Test (1): 5 (5 April 2013)

Mid term Test (2):10 (17 May 2013)

Lab Experiment : 20

Final Exam: 60