Raceway theory is "Keep the water fresh and moving". Basically it's high-level replacement rates.
In addition to that, what are the dimensions, depth, proximity to current pond and I assume you're using the water from your existing pond?
Such as, being pumped in one end of the raceway and exiting back in to your existing pond, via a below surface screened outlet?
Thanks, I'm just trying to get a mental image of your idea.
PS - sorry to get off-topic