Thank you for your question! This type of pool is called a perimeter overflow. It has a hidden gutter system underneath the coping that carries the water to a collection basin. Water is constantly recirculated from this basin to keep the dramatic effect of water level with the pool patio.

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Approximately how much more does this detail cost over a regular pool edge?

It depends a lot on the pool design and location. In general, expect about $100 to $150 per foot of perimeter for this type of knife edge overflow with a hidden trough and catch basin.