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• Network tracing tools - ability to conduct tasks on each network, including : trace upstream , trace downstream , find connected features, and more The following figure is a schematic of the full ArcGIS Water Distribution Data Model : ArcGIS Water Distribution Data Model of All of ESRI ' s ArcGIS data models , including Water Distribution and Sanitary Sewer/Storm Water can be downloaded for free from ESRI ' s website (www.esri . com ) . Data models can be downloaded in three different formats , including : GIF file, UML, or Repository . The GIF file is merely an image , to be used as an analysis diagram . The UML can be opened in MS Visio , to be modified using CASE tools . MS Visio Enterprise is required to be able to export the modified data model to an MS Repository database . The downloadable repository can be imported directly into ArcCatalog , to create a geodatabase . Data models can be modified in either MS Visio or ArcCatalog . An enterprise geodatabase can be used to maintain water, sanitary and storm water - networks . Separate feature datasets should be created for water, sanitary sewer and storm water networks . The next step is to populate each feature dataset with utility data . Once each feature dataset is conflated , sources and sinks must be added to the network . Sources designate the origin of flow, and sinks designate the end of flow. The figure below represents a sanitary sewer network , created by Geographic Technologies Group for the City of Pearland , TX , displayed in ArcMap . Gravity mains are displayed in different shades according to pipe diameter. Force mains are displayed in red and blue . Lift stations and wastewater treatment plants are also displayed . Other features, such as manholes and cleanouts are available for display, but are not turned on in this example, because of the scale of the map . 88 GIS Needs Assessment and Implementation Plan Chapter 1 - Departmental GIS Needs Assessment