GREY'S ANATOMY - "Here Comes the Flood" - A plumbing leak becomes a deluge and wreaks havoc at Seattle Grace, as the Chief attempts to implement new teaching policies and George tries to retake his residency exam; meanwhile Derek hopes to move the roommates out of Meredith's house, to their surprise, on "Grey's Anatomy," THURSDAY, OCTOBER 9 (9:00-10:01 p.m., ET) on the ABC Television Network. (ABC/DANNY FELD) ERIC DANE (BACKGROUND), KATHERINE HEIGL, BROOKE SMITH, JUSTIN CHAMBERS