Dear Bhai,
Flow rate is nothing but velocity, So Velosity=Distance travel(S)/Time(t), Hope you got points.
Regards
Dr.Sethi
Dear Respected Researcher Rajeeb K. Mohanty,
You can try (may not feasible for every one) to use a Digital flow meter which is very cheap and easy to operate. Sorry for any inconvenience. (It may function if you modify to some extent on your requirement).
Flow meter: For determining the amount of water passing through a plankton net. Diameter of propeller 75 mm. 5 digit counter, easy installation by a triple point connection of the nose piece. With back-run stop for vertical operation. It is used determine the length of way that travels by a plankton net. KC Digital flow meter, with back-run stop (Non-resetting)
Rigging instructions: Installation of the digital flow meter is made by a triple point connection of the nose piece inside the net ring. Determination of the water volume passing through plankton net. The digital flow meter incorporates a three blade impeller coupled directly to a five-digit counter which records each revolution of the impeller. Please note that the counter cannot be reset to "0". Before operating the unit, you must note all figures. The number of revolutions is read by noting the difference in beginning and end readings.
Dr. Mohanty
As the flow rate while draining a pond water will vary over time (i.e., during the draining period) due to decrease in hydraulic head of the pond, discharge-cross section-time method will be an approximation only for determining flow velocity. Hence, easy and accurate measurement can be made through use of digital flow meter.
I agree with M.G. Mandal. Discharge from the pond is a function of head at the outlet. Seems that a simple broad or sharp-crested weir equation would work in this situation. It may not be exact, but likely close enough. If you have a water-level logger to record change in head, then you'll have a time-series of discharge, and ultimately volume released.
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