Comparative Study of Flow Measuring Devices for Low Discharge

Abstract

The wide range of flow measuring devices are available for use in Open Channels. In absence of guide line and recommendations, it is difficult for the field staff to s elect a particular type of measuring device. It is particularly more true in the case of measuring small discharge (upto 40 lit/sec.) Therefore, a comparative study for evaluating different types of devices for measuring discharge upto 40 lit/sec. (lps) was undertaken as adaptive research. Partial flume, cutthroat flume, Board creasted Weir RBC (Portable) flume s tanding Wave flume and 90° - V Notch were selected for the study as these are commonly used in construction, use and maintenance, experiments were carried out in the Open Channel. Broad Creasted Weir (replogle) of 20 cm sill height tops the list followed by 90° V- n otch and portable standing wave Flume.