Question: Which canal is the largest and most important drainage canal in the city of New Orleans, the 17th Street Canal or Champlain Canal?
Related documents: [0]  [DOC] The 17th Street Canal is the largest and most important drainage canal in the city of New Orleans. Operating with Pump Station 6, It moves water into Lake Pontchartrain. The canal, along with the Orleans Canal and the London Avenue Canal, form the New Orleans Outfall Canals. The 17th Street Canal forms a significant portion of the boundary between the city of New Orleans and Metairie, Louisiana. The canal has also been known as the Metairie Outlet Canal and the Upperline Canal. [END] 
[1]  [DOC] The Champlain Canal is a 60 mi canal that connects the south end of Lake Champlain to the Hudson River in New York. It was simultaneously constructed with the Erie Canal and is now part of the New York State Canal System and the Lakes to Locks Passage. [END] 
Answer: 
17th Street Canal
17th Street Canal