While I concur with the ...

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While I concur with the opinion of Mr Andre Vandeloo, the actual readings of any flow meter will depend on the location of the flow meter so as to maintain a straight reach upstream and downstream of the meter, accuracy (tolerance) as well as the calibration status of the flow meter. The actual reading also depends on the actual range of flow compared to the calibrated range of flow. The nearer (more or less in the middle portion) the actual range of flow is to the calibrated range of flow, the more will be the accuracy. You may have to consider the above issues and make necessary corrections to the readings of the flow meters to enable any comparison. Another cause for the variation may be NRW in between the pump station and the inlet to the reservoir. Hope I am clear my friend.