Conceptual Design
You have been asked to develop a data model for the Drip Drip Water Company (DDWC). DDWC is the sole supplier of water to the citizens and businesses of the town of Drip Drip.
Each of DDWC's customers is classified as being either residential or non-residential. Each customer may have a water meter that measures the water consumed by the customer at a particular service address. Customers may have more than one service address.
Water meters must be replaced when they have been in use for 5 years. We can assume that a meter will never be damaged or become unserviceable and will not be re-assigned to another service address.