How much will water cost? This is an important question because if you can afford a little excess water, then this can be used to keep water quality high and allow for a little additional feeding. What would happen to the water if you added more than the pond capacity? If it isn't feasible to add excess water, then you could use a big waterfall to add ambiance, and to keep water fresh. Is this a possible consideration?
You can make a 3500 sf pond act like a 10,000 sf pond if you carefully control the water quality. Size doesn't always matter.
