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When a pool has an attached raised spa, it offers the chance to incorporate the visual and audible appeal of a spillover (spillway). One or more sections of the top of the spa wall are built at a lower level or with open spaces to serve as a spillway through which water from the spa flows into the pool.

Usually the spillover appears as a thin sheet of water falling evenly into the pool. Some spillover spas consist of one wide cascade, while others may include a few separated, narrow spillways. .