A door bottom system is used with an entryway system having a door panel movable between open and closed positions. The door bottom system includes a door sweep movable with the door panel between first and second positions corresponding with the open and closed positions, respectively. The door bottom system includes a threshold assembly including a sill that defines a channel adapted for accepting a fluid. The threshold assembly includes a seal extending downwardly toward the sill to a distal end and movable between initial and sealed positions. The door sweep selectively engages and moves the seal from the initial position in the first position to the sealed position in the second position. The seal extends over and covers the channel in the initial position. The seal at least partially uncovers the channel in the sealed position such that the distal end of the seal is positioned above the channel.