Good water measurement systems enable accurate accounting of water use and permit the available water to be supplied at optimum rates to the areas where it is intended to be used. A Parshall Flume is normally used as flow measuring device for open-channel flow. It is suitable to ease of manufacture and installation. At the point of measurement there is much work has attempted to calibrate and develop a discharge relation equation for large Parshall Flume. Hence, accurate relation between discharge and upstream head valid for small sizes of Parshall flume is required. In present paper four different sizes of Parshall flumes, having different throat width fabricated and tested in the laboratory under free-flow condition. Coefficient of discharge and exponent are determined by using MATLAB programming and developed a single equation for the different flume sizes. The relation is simple and suitable to use for the small Parshall Flume.

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In multi phase mixing of flow streams, the measurement of fraction of individual components with consideration of proportion of volume need to be analyzed considering the serious issues in many chemical and other processing industries. Even though, quantifiable measurements technique are exist for the calculation of solubility, partial pressure, molar fraction and VOF, the VOF measurement is the meaningful measure of percentage fraction of air in water. In this experimental procedure, the method to resolve the Volume fraction (VOF) is discussed and the same is achieved by impedance probe method.

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