Sketch the Specific Energy Diagram, and show that for a given open channel and discharge, the Spec Energy has a minimum value at Critical Depth. State the assumptions made. 5(а) Work from first principles and show that the minimum width of constriction in a rectangular channel Bmin , for a given discharge, Q, which would not affect upstream water level can be expressed as: 5(b) B.
Sketch the Specific Energy Diagram, and show that for a given open channel and discharge, the Spec Energy has a minimum value at Critical Depth. State the assumptions made. 5(а) Work from first principles and show that the minimum width of constriction in a rectangular channel Bmin , for a given discharge, Q, which would not affect upstream water level can be expressed as: 5(b) B.
Chapter2: Loads On Structures
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Transcribed Image Text:Sketch the Specific Energy Diagram, and show that for a given open channel and discharge, the Specific
Energy has a minimum value at Critical Depth. State the assumptions made.
5(а)
5(b)
Work from first principles and show that the minimum width of constriction in a rectangular channel,
Bmin , for a given discharge, Q, which would not affect upstream water level can be expressed as:
B.
'min
8.
V 27
Where E, is the upstream specific energy.
Ignore bed slope and energy losses.
A bridge is to be constructed across a rectangular canal of width 30 m carrying a discharge of 35m°s' at
a depth of 2.1m under uniform flow conditions. In an attempt to reduce the span of the bridge, it is
proposed to narrow the canal at the bridge site. What is the minimum possible canal width which would
have no influence on the upstream depth of flow? Ignore bed slope and energy losses due to friction and
canal transitions.
5(c)
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