1. CGSnet Network for Wastewater An Explanation of Network Topology and Feature Mapping As Applied to Wastewater Infrastructure

2. Basic Network Theory We are working with a theoretical network topology. We are working with a theoretical network topology. All relevant physical features reference a position on the theoretical network. All relevant physical features reference a position on the theoretical network. Network is typically defined in terms of: Network is typically defined in terms of: NODES – junctions for one, or more than two arc endpoints. Every Arc has a Start and End Node. NODES – junctions for one, or more than two arc endpoints. Every Arc has a Start and End Node. ARCS – paths along which features can exist ARCS – paths along which features can exist

3. NODES Junctions for one, or more than two arc endpoints.

4. ARCS Paths along which features can exist. Every Arc has a Start and End Node. Intermediate Vertices reference Arcs SANITARY network is created first STORM network is created later Crossovers are identified and mapped separately SANITARY ARCS STORM ARCS STORM ARCS (crossovers)

5. Network Features Physical Features are mapped onto Arcs. Physical Features are mapped onto Arcs. Location is determined by: Location is determined by: Distance from start of Arc to Feature Distance from start of Arc to Feature Length of Feature (for linear features) Length of Feature (for linear features) XY Coordinates are also tracked and updated XY Coordinates are also tracked and updated Features can overlap (eg. pipe casings) Features can overlap (eg. pipe casings)

6. Mapping of Features SANITARY features are mapped first Feature Items Arcs

7. Mapping of Features STORM features are mapped last SANITARY Feature Items STORM Feature Items CROSSOVER Feature Items SAN Arcs STM Arcs CO Arcs Nodes

8. Data Relationships MSCATALOG - Used by MicroStation to identify Tables Drawing Elements User-Defined Attributes (eg. SAN_PIPE) Feature Item Record -Path on which it lies -Distance to start -Length (if any) Feature Definition Arc DefinitionNode Definition Arc Vertices Feature Symbology Customized Manipulation Elements are encoded with table number and user-data row number (MSLINK) Elements are encoded with a second table number and row number (MSLINK) Feature row also references User-Defined Attribute Identifies basic parameters for feature type Identifies default symbology for feature type Network path on which feature is located Defines the location of the pathway

9. Main Features of Data Model Seamless network Seamless network Guaranteed Topology (connectivity) Guaranteed Topology (connectivity) All features are grouped based on Arc (pathway) they lie on All features are grouped based on Arc (pathway) they lie on Referential integrity of features with network Referential integrity of features with network All primary data is stored in database, DGN files serve as editor/presentation medium. All primary data is stored in database, DGN files serve as editor/presentation medium. Real-time maintenance of network within normal Drafting workflow Real-time maintenance of network within normal Drafting workflow

10. Future Uses Delivery of network information in ad-hoc form Delivery of network information in ad-hoc form Integration with Electronic Block Profile elevation data, for automatic receipt of new data and delivery of data to clients Integration with Electronic Block Profile elevation data, for automatic receipt of new data and delivery of data to clients 3D-visualization for analysis 3D-visualization for analysis

11. Questions?…