Question

Write short note on the following Ogee spillways

Answer 1

This is the most common type of spillway provided on gravity dams. The profile of the spillway is ogee or ‘s’ shaped.The overflowing water is guided smoothly over the crest and profile of the spillway so that the overflow water does not break contact with the spillway surface.If this is not assured, a vacuum may form at a point of separation and cavitation may occur. In addition to cavitation, vibration from the alternate making and breaking of contact between the water and face of dam may result in serious structural damage.