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Measuring in a bucket as mentioned above is the correct way of measuring.

A person operating the hand pump is as much part of the "pump" as the "steel parts". If you are concerned with the yield of the borehole you should perform this test during the day, as many times as the number of people you expect will be using the pump.

Children will be using the pump as well, I presume, and you should pick some "representative child" and perform the test with her. This will also allow you to evaluate the effort required to draw a bucket of water from the pump.

You may want to plan for a test during the rainy season as well as during the dry season.