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.