Flood was drafted in the sixth round, 188 overall in the 2003 NHL Entry Draft by the Montreal Canadiens. He played in the ECHL prior to signing a free agent contract with the Columbus Blue Jackets playing for their AHL affiliate, the Syracuse Crunch. On November 26, 2006 Flood was traded to the Carolina Hurricanes organization for defensemen Derrick Walser. He was not re-signed by Carolina and on July 6, 2009 he signed a one-year, two-way contract with the New York Islanders. Flood spent the majority of the season in the AHL. Following a concussion to Islanders defensemen Dustin Kohn Flood was called up to the NHL, making his debut on March 25, 2010 against the Calgary Flames. Flood played 6 games for the Islanders registering 1 assist and a -4 plus-minus rating. During the 2010 offseason, Flood signed a one-way contract with the Manitoba Moose. On July 3 he signed a contract to play for the Winnipeg Jets. He scored his first NHL goal as a member of the Jets against Martin Brodeur of the New Jersey Devils on November 5, 2011. On July 22, 2012, it was reported that Flood had signed a contract with Lokomotiv Yaroslavl of the Russian Kontinental Hockey League. Flood was a part of the rebirth of the organization following the tragic plane crash that forced Lokomotiv to cancel its 2011–2012 season. In 52 games with Yaroslavl, Flood was a stay-at-home fixture on the blueline, posting 6 points throughout the 2012–13 season. On July 10, 2013, Flood returned to North America and signed a one-year two-way contract with the Carolina Hurricanes. Flood returned to the KHL after a single season within the Hurricanes organization in signing a two-year deal with KHL Medvescak Zagreb on June 11, 2014. After a single season in Croatia, Flood moved to KHL rivals HC Lada Togliatti on a one-year contract on June 19, 2015. In the following 2015–16 season, Flood struggled to find his offensive presence with Togliatti, contributing with 6 points from the blueline in 38 contests. On June 24, 2016, Flood left the KHL to sign a one-year contract with Austrian club, EC Red Bull Salzburg of the Austrian Hockey League. In the following off-season, Flood returned to North America as a free agent. He accepted an invitation to try-out for the 2017–18 season, with the Manitoba Moose of the AHL on September 25, 2017. In joining the affiliate of former club, the Winnipeg Jets, Flood played in a single game with the Moose before he was released from his tryout on October 17, 2017. After spending his second season in the Finnish Liiga with Ilves in 2018–19, Flood returned to the Austrian EBEL, agreeing to a one-year contract with the Vienna Capitals on June 18, 2019.
