A double walled flume and leak detection system includes a flume with a liquid containment wall with an outer surface and an inner surface. The flume is designed to contain a liquid therein. A secondary wall has a first and second edge which are spaced apart and joined to the outer surface of the liquid containment wall so as to define a secondary containment area between the outer surface of the liquid containment wall and the secondary wall. A leak detection system is in communication with the secondary containment area for detecting the presence of liquid in the secondary containment area so that a leak may be detected.