RedactedNarrative: Operator 1 was leaving Ft. Loudoun Marina on Yamaha PWC after refueling when he crossed wake of another vessel causing him to go airborne.  The next thing Operator 1 remembers is Loudon Co rescue boat pulling him out of the water.  Operator 1 was sent to UT hospital by ambulance.  Operator 1 said he was knocked out.  Operator 1 had laceration on forehead that required stitches.  The accident occurred near arrival point on Ft. Loudoun Lake in Loudon Co.