RedactedNarrative: The watercraft was traveling south near the center of the lake while pulling a tube which had two occupants on it (one adult and one child). The watercraft was traveling approximately 20 miles per hour and quickly slowed down. At that time, the tube hit a large wave and the occupants were tossed from the tube. The adult female was found unresponsive and floating face up in the lake. She was then pulled into the boat and taken to shore. It was thought she had been knocked out with possible concussion and an anxiety attack. An ambulance transported the victim to the emergency room where she was treated and released. All occupants in the boat and on the tube were wearing life jackets. None of the individuals involved had been drinking.