A 'summer outdoor swimming pool plan' typically refers to a layout or design plan for a swimming pool that is meant to be used outdoors during the summer months. Such a plan would include details about the pool's shape, size, location, surrounding landscaping, and any amenities such as decks, poolsides, or shade structures. The design takes into account factors like safety, accessibility, and aesthetic appeal, as well as practical considerations such as water circulation and filtration systems.