Yeah, I see where you are coming from with the ease of maintenance. I appreciate you taking the time to put in your thoughts.
Supposedly my three overflows will be capable of draining 3,600+. I am estimating that I am putting 1500-2000 gph into the display. So when the skimmer @ 900 gph, which is the most water demanding accessory, is shut off using a ball valve on the manifold. It will add the 900 to 2,000. That's 2,900. That is over estimating too. When that extra 900 is brought to 6 ft. It will be greatly reduced. Overflows should be able to handle at LEAST 600 more gph before their limits are being pushed.