Aeration performance of triangular notch weirs at recirculating system

An adequate supply of dissolved oxygen is essential for the survival of aqu atic organisms. Hydraulic structures can increase dissolved oxygen levels b y creating turbulent conditions, where small air bubbles are carried into t he bulk of the flow. Plunging overfall jets from weirs at recirculating sys tems are a particular instance of this. This paper seeks triangular notch w eirs having different weir angle (alpha) and how they affect the aeration p erformance. It is demonstrated that the aeration efficiency of a 90 degrees triangular notch weir is generally better than that of the other weirs.