The water level in all storage facilities shall be monitored twice daily, at those points in time at which the greatest and least amount of storage is normally found to exist, and records kept of levels by date and time or by continuous recording chart. The department will be notified annually by January 31st of the subsequent year whenever actual average day demand on an annual basis for systems supplied by wells exceeds total storage capacity plus the supply available from approved emergency interconnections, standby power and alternate sources.