What is this?

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I am exposing my ignorance about pools. Can someone explain to me the purpose of this? It is located behind a small slit fall going into the pool.
what is this, outdoor living, pool designs, view from back side
view from back side
what is this, outdoor living, pool designs, view from back side
view from back side
what is this, outdoor living, pool designs, front slit fall
front slit fall
what is this, outdoor living, pool designs, inside appears to be a small drain and water pipe
inside appears to be a small drain and water pipe.
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