1 What are geometric networks?

A geometric network is a collection of feature classes that share a common spatial reference and topology. Feature classes are groups of geographic features that have the same geometry type, such as points, lines, or polygons. A geometric network can include feature classes that represent different types of network elements, such as pipes, junctions, valves, or meters. Each feature class has a set of attributes that describe its properties, such as diameter, material, or flow rate. A geometric network also defines the rules and relationships that govern how the features are connected and interact with each other.

3 How to edit a geometric network?

After creating a geometric network, you may need to edit it to reflect changes in your water distribution system, such as adding, deleting, or modifying features. You can use the editing tools in your GIS software to perform various editing tasks, such as snapping, splitting, merging, or reshaping features. You can also use the attribute table or the attribute editor to update the feature attributes, such as changing the pipe diameter or valve status. When you edit a geometric network, the network topology is automatically updated to maintain the connectivity and consistency of the network.

4 How to perform network analysis?

Using a geometric network to model your water distribution system can provide several advantages, such as the ability to perform network analysis. This process involves applying mathematical models and algorithms to a network in order to calculate or optimize certain parameters or outcomes. For instance, you can trace the flow direction and path of water in your network, identify the sources and sinks of water, locate the critical points or segments of your network that affect system performance or reliability, simulate the impact of network failures or disruptions on the water supply or demand, and optimize the network design or operation to minimize cost, energy, or water loss. To conduct network analysis, you must use GIS software tools or extensions such as the Network Analyst, Utility Network Analyst, Water Utilities Network Toolbox. Alternatively, you can utilize external software or applications that integrate with your GIS software like EPANET, HEC-RAS, or SWMM.

6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?