Composite manhole cover with embedded detection

A composite manhole assembly, comprising:

• a manhole cover having
• a disc-shaped body made of a fiber-reinforced thermosetting composite, the disc-shaped body having a cavity therein adapted to receive a mass of magnetic material detectable by a metal detector;
• the disc-shaped body having an edge;
• the fiber-reinforced thermosetting composite comprising a resin, a fiber, and a filler;
• a manhole frame being substantially ring-shaped and having an external circumference and an interior circumference, the interior circumference having a supporting edge adapted to physically couple with the edge of the disc-shaped body such that the disc-shaped body is securely nested therein;
• and
• the manhole frame comprises a fiber reinforced thermoset polymer.