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All of ESRI ' s ArcGIS data models, including Water Distribution and Sanitary Sewer can be <br /> downloaded for free from ESRI ' s website (www .esri .com ) . Data models can be downloaded <br /> in three different formats, including : GIF file, UML, or Repository . The GIF file is merely an <br /> image, to be used as an analysis diagram . The UML can be opened in MS Visio , to be <br /> modified using CASE tools . MS Visio Enterprise is required to be able to export the modified <br /> data model to an MS Repository database . The downloadable repository can be imported <br /> directly into ArcCatalog , to create a geodatabase . Data models can be modified in either <br /> MS Visio or ArcCatalog . <br /> One geodatabase can be created for all utility networks . Separate feature datasets should <br /> be created for water and sanitary sewer networks . The next step is to populate each feature <br /> dataset with utility data . Once each feature dataset is conflated , sources and sinks must be <br /> added to the network . Sources designate the origin of flow, and sinks designate the end of <br /> flow . The following figure represents a sanitary sewer network, created by Geographic <br /> Technologies Group for the City of Pearland , TX , displayed in ArcMap . Gravity mains are <br /> displayed in different shades according to pipe diameter. Force mains are displayed in red <br /> and blue . Lift stations and wastewater treatment plants are also displayed . Other features , <br /> such as manholes and cleanouts are available for display, but are not turned on in this <br /> example , because of the scale of the map . <br /> Example of a Sanitary Sewer Geometric Network in ArcMap <br /> ' Ele Edl vew NSM Selection Tools Window Help <br /> ------------ <br /> Ne[wo-k - er 4o�mwaler_Ne:wod Flow Adel Trace Tazk'. 9nd Ccmmrm4nce2or <br /> ❑ 6' 61 a lai rdJ ] : 1 o, R'1 <br /> Editor 1 J �❑ <br /> 0 Layers <br /> - sHeNraSv¢re n <br /> iub'r,po <br /> hstkator r3 <br /> Kill 'redMoiri <br /> n <br /> 0 [5F¢uy R <br /> mbtyra <br /> Q R <br /> — Q »MdnhOIB n _ <br /> - a�anneleNissm3 n n <br /> q IS R <br /> -- - 0 <br /> sscraviryMarn <br /> Anothervalues> n n n <br /> n <br /> wramenn � n n <br /> Maa <br /> uoknowr, q <br /> R <br /> IS N IS <br /> j., <br /> k n <br /> 0., <br /> is R p <br /> it n n IS <br /> R q <br /> IS n <br /> 8" rL n <br /> Ii <br /> 271 <br /> J <br /> o ,day I Sop a � c � � 21 <br /> .. Cramin9 R ❑ A Fri al vj C ] B l U A <br /> 31AEOS26 _76g513.52Fmt <br /> Properly configured utility networks will allow the Utilities Services Department to conduct <br /> network flow and tracing tasks. The following figure shows the some sanitary sewer network , <br /> with gravity and force mains, manholes , lift stations , a wastewater treatment plant, and <br /> 142 <br /> GIS Needs Assessment and Implementation Plan Chapter 1 - Departmental GIS Needs Assessment <br />