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These designs vary, as some sink the pool a few feet into the ground (giving the top half a raised look), while others are half built into the slope of a hill. Sips have a consistent depth throughout, and are usually around 4 feet deep. To create the pool’s base, lay down a layer of gravel beneath the concrete block flooring. Ensure that the gravel is at least three inches thick since this will help prevent any shifting or sinking over time.