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The New Jersey Water-Transfer Data System (NJWaTr) is a database design for the storage and retrieval of water-use data. NJWaTr can manage data encompassing many facets of water use, including (1) the tracking of various types of water-use activities (withdrawals, returns, transfers, distributions, consumptive-use, wastewater collection, and treatment); (2) the storage of descriptions, classifications and locations of places and organizations involved in water-use activities; (3) the storage of details about measured or estimated volumes of water associated with water-use activities; and (4) the storage of information about data sources and water resources associated with water use. In NJWaTr, each water transfer occurs unidirectionally between two site objects, and the sites and conveyances form a water network. The core entities in the NJWaTr model are site, conveyance, transfer/volume, location, and owner. Other important entities include water resource (used for withdrawals and returns), data source, permit, and alias. Multiple water-exchange estimates based on different methods or data sources can be stored for individual transfers. Storage of user-defined details is accommodated for several of the main entities. Many tables contain classification terms to facilitate the detailed description of data items and can be used for routine or custom data summarization. NJWaTr accommodates single-user and aggregate-user water-use data, can be used for large or small water-network projects, and is available as a stand-alone Microsoft® Access database. Data stored in the NJWaTr structure can be retrieved in user-defined combinations to serve visualization and analytical applications. Users can customize and extend the database, link it to other databases, or implement the design in other relational database applications.
Abstract Introduction Purpose and scope Acknowledgments Development of the NJWaTr data model NJWaTr requirements The modeling process Modeling software NJWaTr design principles Entity/relationship diagramming conventions Normalization Keys and relationships Domain tables Naming standards Table- and field-name construction Table Functional Prefixes NJWaTr Data Model Definition of the NJWaTr core entities Core data model Site subject area Conveyance subject area Transfer/volume subject area Location subject area Owner subject area Resource subject area System subject area Address subject area DataSource subject area Permit subject area Alias subject area User-defined details Operational issues and procedures Indexes Table loading order Maintenance update queries Volume unit updates Volume conversion to common units and updating transfers Conveyance action phrase updates Construction and use of views Example of view construction Standardized and optimized views Customizing and extending the data architecture Summary References cited
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Last modified: Saturday, January 12 2013, 11:41:06 PM