About nodes
A node is a location within the water supply system where head, inflow, or outflow is known.
There are six different types of node in InfoWorks WS Pro:
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Simple nodes have no special features. They may have an outflow due to demand from service connections, branching points, or pipe ends. |
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Fixed head nodes, also called sources, are large bodies of water where the water level effectively remains constant throughout the simulation. For example lakes, pools, or wells. |
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Through transfer nodes, a known quantity of water is exchanged between the system and its neighbours. This type of node is used to simplify complex real-life connections, such as control valves or secondary supply systems. |
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Reservoirs, or variable head nodes, are bodies of water where the water level varies during the simulation according to the balance of inflows and outflows. For example, service reservoirs, water towers, or contact/balancing tanks. |
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Hydrant nodes allow detailed modelling of hydrants. These are of significance in fire flow analysis and analysis of mains flushing schemes. |
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Well nodes allow modelling of boreholes / wells, either as a fixed head, or by use of a drawdown curve.. |
If you are building a new network, nodes are added to the network using either the GeoPlan window or the grid view. The geographical view provides the opportunity to place the nodes over the top of an existing map, while grid view is ideal for entering node information that is already held in tabular form.
Depending on options you can set up, when you add a new node in the GeoPlan window, the program displays the appropriate node property sheet, which allows you to define the node and its attributes. The number of tabs on the sheet depends on the type of node that is selected.
Node demand and additional demand
Demand can be attached to simple nodes, reservoirs and hydrants. For more information on node demand, see About assigning demand to nodes.
You can model additional demand at the node in two ways:
- Exceptional demand represents time varying additional demand from the node such as bursts or firefighting.
- Hydrant operation allows you to model a time varying percentage opening of a hydrant represented by the node.
Pollutant Inflow
You can model specific pollutant inflows at a node by applying a time varying pollutant concentration. See Modelling pollutant concentration at a node.
