day,

Water flow rate testing should have been done when the well was initially drilled.

Pumping water from a pond is considered an "infinite" source so you just need to calculate your pumping and piping requirements based on the needs of your project.

Water wells DO NOT operate in the same manner. You can only pump what the aquifer will yield to you - with a large safety margin so that you do not pump the well down to the level of the perforations. (Several bad things can happen at that point.)