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The discharge flowing through open channel, can be measured by various devices which can be installed in the open channel. The guidelines and recommendations are needed for their use to the field staff, for choosing the precise type of device. Low discharge say less than 40*10-3m3/s can be suitably measured and comprehensive study can be done. Standing wave flume (SWF), 90-degree V- notch, Parshall flume and broad crested weir (Replogle) are chosen for comparison purpose, due to their common use in construction, ease in maintenance, afflux, location specificity and cost. Experiments are carried out in the open channel hydraulic lab. Broad crested weir (Replogle) of 20 cm sill height tops the list followed by 90-degree V- notch portable SWF and Parshallflume
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