I have drilled several wells that fed various ponds. Currently my 2 acre pond has a well that was around 300 feet with strong water. My well guy put in a 3.5 horse pump that does around 35 GPM and it keeps my pond level during the summer when our spring is not running.

I would rely on your well guy - as a side note when my well is pumping 24/7 the electric bill takes a noticeable jump.

Good luck