Here’s a mock-up of a drainage hopper that will be placed on top of the pier columns to catch the stormwater from the Selmon Extension bridge. The hopper is a drainage fitting with an open top and an open base, where the base opening is typically smaller than the top. The bottom piece is stationary and the top lid moves back and forth as the bridge expands and contracts due to thermal movement. In the adjacent photo, you can see the bearing seats that sit on top of each column but each one will only have one drain pipe.
Additional Information: VLOG: Where Does the Stormwater Flow?