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Using the measurements you gave, i put your pond alone at somewhere between 12,000 and 13,500. That doesn't include filters. IMHO, I don't think 2 Nexus are enough by themselves to support this size pond. Are you gravity feeding the drains into any kind of vortex pre-filter prior or just directly into the Nexus'? Have you thought about using Bakki Showers with Bacteria House Media - may cost a little more than those Nexus, but would sure perform better!!
What pumps are you planning on using? Brand, HP and flow. Any UV?
Also, in your diagram you have both skimmers on the same wall flanking the waterfall. I see your wind direction locator. Does that have something to do with these locations, as otherwise they aren't really positioned properly. Your mid level pickups are a good idea, but again they should not be so close to your waterfall. Really should be located on the opposite wall.
Yes, your skimmer water should be pumped through filtration of some kind. An Aqua Ultima II model 10,000 would handle your skimmers and mid-level pick-ups quite nicely.
IMHO, if I were designing this pond, the waterfall would be at one end(to the right of the diagram if possible), and the skimmers at the other end. I would then place the mid-level pick-ups on opposing walls along the length, about 3 feet below surface.
Make sure your contractor understands the liability of that "viewing window". If it springs a leak, you really got major problems. By the way, is it going to be located in your filter vault? Otherwise, how are you going to structurally support that side of the pond (I'm assuming this is a standard 6" gunite shoot!?) especially considering the depth of 8-9ft.
Hope something here helps. I build ponds, so if you want to PM me I would be glad to help anywhere I can.
Regards
Mike
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