![]() ![]() Repeat the above procedure for various constant heads and calcite the average values of hydraulic coefficients of an orifice.Take the stopwatch and note down the time taken for the rise of water up to a certain height in the measuring tank and calculate the discharge.After recording initial coordinates, slide the vertical scale through the horizontal scale up to a certain distance and adjust the vertical scale with its hook touching the water jet and record the final coordinates (x 2, y 2). ![]() Note down the initial coordinates (x 1, y 1) at this point. Adjust the vertical scale to the position of vena-contracta such that the hook provided at the bottom of the vertical scale should touch the center of the water jet.At vena-contracta, measure the diameter of jet using micrometer contraction gauge.He found that the discharge coefficient is conversely corresponding to the V-notch angle () and directly proportional to the relative head (hP), Figure1. 20tentatively assessed the effect of vertical flow curvature on the discharge coefficient. After attaining constant head, now observe the water jet coming from the orifice and note the point where maximum contraction occurs which is nothing but vena-contracta. crested V-notch weir was mulled over by 19,focusing on the bed profile downstream the weir.Maintain a constant head in the supply tank by adjusting the water supply valve provided.Fill the supply tank with water and allow the water to flow through the orifice.The Procedure to determine hydraulic coefficients of an orifice is as follows: ![]()
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