In Overflow, an episode of Ranger Bill, the small town of Naughty Pine is drenched in relentless rain, causing a halt to the usual activities of Ranger Bill and his crew. The heavy downpour raises concerns about the Big Ridge Dam, which holds back the waters of Big Ridge Lake. This dam is essential for irrigation, and the increasing water levels signal imminent danger. Ranger Bill receives an urgent call from Frank at the dam, warning him that the pressure gauge readings are alarming and that immediate action is needed.