In your experiment, the flow-rate is defined as

where V is the total volume of fluid measured (e.g., with a bucket), and is the amount of time (measured with e.g., a stopwatch) for which the fluid was measured.

Experimental Setup for measuring Pressure Drop across a given pipe length as a function of Flow Rate.

The direction of flow is shown by the arrows in the pipe. Two pressure gauges are attached to the pipe, a distance apart. The difference between the readings on these two gauges gives the pressure drop, , through the pipe over the length . We can get a good idea of how the pressure drop is related to the flow-rate by plotting as a function of Q for many different flow rates.

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