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would parallel the waterfall, with all the plumbing from the pump going underneath the path to the top.
Design Goals With a basic layout established, it was time to design the system. Water from the pond bottom would flow through two 4-inch, non-aerated bottom drains to a
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POND Trade Magazine
Wave 36 220-gallon settlement tank with a 24-inch static prefilter. I chose non-aerated bottom drains because I didn’t want to pull the warmer water off the bottom and blast it to the top when the air came on in the winter. The in-pond aeration is done with two aeration sticks on each side of the pond between the waterfall and the beach entry. The air sticks, which are made with aeration tubing, are located on the plant shelves just below the surface. This position keeps the aerated water from disturbing the surface flow in front of the skimmer on the other end and will keep the surface from freezing solid in the winter. For the skimmer, I recommended a Helix with the fish-safe circular weir. The pump vault is dug into the ground a couple of feet deep to protect it from the cold. The pump vault has an insulated lid. The settlement tank, prefilter and skimmer are joined at the front of the pump intake with isolation valves. A 3-inch line from the prefilter and a 2-inch line from the skimmer connect to a Wave II ½-hp pump. This pump flows at just under 8,000 gph at 10.39 feet of head using 5.87 amps. One 3-inch line runs from the pump to the top, where the biofilters are located. A 3-by-2-inch tee is located just off the pump inside the vault to divert water directly back into the pond pondtrademag.com