Perimeter-overflow pool
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A perimeter-overflow pool is a type of vanishing-edge pool designed so that water spills over all four walls, giving it the appearance of a mirror.
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How it works
To create this effect, the tops of all four walls are set lower than normal, so they sit slightly below water level. This way, water spills over the entire perimeter and into a containment vessel, from which water is recirculated back into the pool.
These pools often are set at ground level, with water dropping through a slot or grate and into underground gutters. A simple slot in the decking has become more popular, because it barely affects the appearance of the deck.
A perimeter-overflow pool, or parts of it, also can be elevated higher than ground level, so that the water spills over the raised walls and into an open catch basin, or through a grate or slot leading to a gutter.
If the gutters or catch basin can’t be made large enough to contain all the water, a remote holding tank may also be installed.
Design applications
Because surface water doesn’t have a chance to bounce off the walls like in normal pools, perimeter-overflow pools have the most calm, reflective surfaces. Hence, people will compare them to a mirror on the ground.
They are very popular for use as reflecting pools or ponds or in any setting where you want to reflect the sky and surroundings.
Because of their sleek finish, they also are found in many contemporary designs.
Design tips
As with vanishing-edge pools, the goal is to enhance the reflective quality. Darker colors and smoother surfaces on the pool interior help.
Also consider whether you want waterfalls, fountains, spillover spas or any other moving water flowing into the pool, because they will agitate the surface somewhat.
Technical challenges
These pools are a more rare form of vanishing edge, and they require an even higher technical acumen. Not every builder can do them.
The top of the wall, around the entire perimeter, must be exactly level or within a fraction of an inch. Many experts strive to fall within 1/16 inch of level. Those who make and veneer the top of the walls must work with exactness.
The plumbing also can prove complicated, as water often must flow from the gutters into a holding tank and back to the pool. On the way to the holding tank, water has to move via gravity rather than being pumped away. The pipes must be carefully sized so that water can move from gutter to tank slowly. Otherwise, there’s the possibility of creating a slurpling or gurgling sound.
Featured Articles
On the Edge -- Pool & Spa News -- February 28, 2005
