Side channel spillway


  • This spillway is suitable for earth or rock fill dams, in narrow canyons and other situations.
  •  This spillway is also the best choice where a long overflow crest is require so as to limit the surcharge head and also under the situation where abutments are steep and precipitous.
  • In this spillway the control weir is kept along the side.
  • The flow after passing over the crest turns at approximately 90°.
  • Flow may enter the side channel from one side only or from both the sides and one end also.
  • Discharge characteristics are similar to ordinary overflow weir, except that at high discharge its crest may be partly submerged.
  • Generally a trough is formed on D/S side of the crest and water enters it before taking a turn to flow in the side channel.

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