Abstract: In one embodiment, an overflow protection system for a fluid transfer system with an opening to the environment comprises at least one sensor and a fluid flow regulating device in communication with the at least one sensor, the fluid flow regulating device configured to change the rate of input fluid flow when a signal from the at least one sensor indicates a change in the output fluid flow rate. In another embodiment, an overflow protection system for a fluid transfer system provides an alert when a change is detected in the output fluid flow rate. In one embodiment, a method for overflow protection in a fluid transfer system with an opening to the environment comprises sensing a reduction in output fluid flow and reducing the input fluid flow or providing an alert.