I just had a well drilled for a garage and a small appartment on top for a single residence only. The well depth is 500' at this I have 2gpm. The well driller recommend going 500' at approx 350' we had 2 gpm. I assume he went the extra footage for reserve. My question is how much reserve will I have and how to calculate what size HP. pump will be needed. What I would like to use as a pump is a MYERS or GOULDS pump. I am sure we need to know more to fill in the equation but rule of thumb is good for me. Thank You.