Rain water hopper heads are also called leader heads or conductor heads and are frequently used as architectural features on buildings, providing both a decorative and functional purpose. Rain water collected by a rain gutter or roof scupper is fed into a leader head. Sometimes a downspout connected to a gutter system or even multiple downspouts will feed into a leader head. Downspouts, also referred to as downpipes or leaders, are the vertical pipes that carry rain water from a gutter or leader head down to the ground to drain into a water barrel, cistern, sewer or seep into the ground. Leader heads or conductor heads fed by a scupper (drain opening in a wall, parapet or edge of flat roof) are sometimes called scupper boxes. Some parts of the world also use the term rainheads when referring to leader heads or rain collection boxes. Functionally leader heads serve several purposes. Leader heads serve as a collection box for multiple gutter downspouts to empty into and funnel those into one downspout leading down to the ground. Leader heads also mix air into the conductor to help eliminate back pressure or vacuum and promote heavy rain water flow through the downspouts. Decoratively and visually, leaderheads or hopper heads also help break up lengths of downspout providing both architectural interest and elegance or panache.