Component parts of a weir ?



Component parts of a weir ?

  • Body wall of the weir
  • Upstream solid apron
  • Apron on downstream side
  • Curtain walls on Upstream & Downstream
  • Talus on Upstream & Downstream
  • Shutter on the crest of weir

Body wall of the weir

  • It is a wall which is constructed to raise the water level on u/s
  • To raise water level on u/s
  • To resist water pressure
  • To resist uplift pressure
 Cold Rolled Grain Oriented

Component parts of weir

Upstream Solid Apron

  • Protect weir from erosive forces during floods
  • Length of apron depends upon discharge in river and length of weir
  • To prevent any leakage in the sub soil

Apron on Downstream Side

  • To reduce the kinetic energy of water
  • Length depends upon height of fall of water nature of soil discharge in river
  • Apron is extended up to the point where there is no scope for erosion
  • It Should have sufficient width to resist uplift pressure

Curtain walls on UpStream & DownStream

  • Upstream curtain wall
    • To reduce uplift pressure
    • Length depends on nature of sub soil
    • To increase length of the creep
    • To reduce exit gradient
  • Downstream curtain wall
    • Protect downstream flow from uplift pressure.
    • To resist kinetic energy of water increase length of creep

Shutters

  • Provide on the crest It can be raised during flood To resist water pressure
    • Protect downstream flow from uplift pressure.
    • To resist kinetic energy of water increase length of creep

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