Post-event modification of local clock values in water distribution system

A method of monitoring a water distribution system via a plurality of hydrant apparatuses, the method comprising:

• receiving, at each hydrant apparatus of the plurality of hydrant apparatuses, respective sensor data relating to at least one operating parameter of the water distribution system, each hydrant apparatus corresponding to a hydrant of the water distribution system, each hydrant apparatus of the plurality of hydrant apparatuses including a sensor configured to output the sensor data, a processor in communication with the sensor, a local clock source, and a communication interface;
• associating, by each hydrant apparatus of the plurality of hydrant apparatuses, the respective sensor data with a first local clock time determined by the respective local clock source;
• obtaining, by each hydrant apparatus of the plurality of hydrant apparatuses, an external clock time from an external clock source;
• determining, by each hydrant apparatus of the plurality of hydrant apparatuses, a respective offset for the received sensor data based on a difference between the local clock time and the external clock time;
• detecting, by a central monitoring system, a water system event;
• transmitting, by each hydrant apparatus of the plurality of hydrant apparatuses, the respective sensor data, the respective local clock time and the respective offset to the central monitoring system in response to the detected water system event;
• and
• determining, by the central monitoring system, normalized times for the sensor data from each of the hydrant apparatuses based on the respective offsets for the respective sensor data.