A node in XPRafts represents a junction of two or more links and the drainage point of a sub-catchment in the drainage system. Link and Diversion Link Data are connected to these objects to create a drainage network.

To input or edit the attribute or model specific data associated with a node, either:

  1. Double-click on the Node, or;

  2. Left-click to select the Node and choose the Edit Data command from the Edit Menu. 

Both actions will open the Node Control Data window. The various dialog boxes and input fields can be viewed and are navigated by clicking on various button items within dialogs. 

The following describes the available options for viewing and manipulating Node control data. 

Runoff Hydrograph Options

Subcatchment Data

Clicking the Subcatchment Data button will load the catchment data window where users can view and edit the properties of the catchment linked to the specified node. 

Direct Input

Hydrographs may be input directly by the user in one of two ways:

  • Direct Input allows users to directly specify the hydrograph coordinates

  • File Input opens a dialog box where users can choose a file from which the hydrograph coordinates are read. 

Retarding Basin

Clicking the Retarding Basin button will display all the information describing the retarding basin or on-site storage at the selected node.

Gauged Hydrograph

A Gauged Hydrograph may optionally be entered for comparative display against a computed hydrograph when undertaking calibration or verification.

Output Control Options

The Output Control is used to set the level of detail for printing in the text output file. In most cases Full Output is not necessary, but may be useful in difficult situations. Partial output is useful for nodes which have storages defined but in general summary output is of sufficient detail. This is particularly the case when Review Results is utilised.

Full Output

Selecting the Full Output option provides extensive results in the text output file created during the execution of RAFTS. This option provides more detail than is generally required, however if a particularly complex simulation is being performed this option may be useful to monitor the intermediate results.

This option is not recommended for general use.

Partial Output

The Partial Output option provides a useful level of detail without an excessively large output file.

This option is recommended for nodes which are defined as retarding basins or storages.

Summary Output

The Summary Output option provides a reasonable level of detail for most situations which do not have storages defined.

This option is recommended for nodes without basins.

Hydrograph Plot

This option provides a text hydrograph plot for this node in the output file. This option has been superseded by the Review Results feature of the XPRafts environment and is not required for plotting hydrographs.

This option is not recommended for general use.

Hydrograph Plot + Partial

This option provides a text hydrograph plot and partial output for the current node in the output file. This option has been superseded by the Review Results feature of the XPRafts environment and is not required for plotting hydrographs.

This option is not recommended for general use.

Hydrograph Export

The Node Hydrograph Export button allows users to define estimated hydrographs file output options.

Save Results for Review

If this flag is selected, output from this node will be saved to a file to allow graphical post-processing. Post-processing can be performed via the Review Results menu command (after the network has been Solve). This flag may be over-ridden by a global flag in Job Control.

Important Notes for Node Data

Computed (LRRM)

Hydrographs can calculate either surface stormwater flows or sewage flows from both dry weather and wet weather sources.

Stormwater Modelling

When rural stormwater flows are being considered only it is usual to only have one (1) sub-catchment entering a node. Catchment area is input in hectares.

When urban stormwater runoff is being analysed two sub-catchments should be included to a node. These should individually reflect the pervious and impervious contributions respectively. Both catchment areas are input in hectares.

Sewer Modelling

When sewage flows are being analysed the split catchment option should be utilised to separately estimate the dry weather and wet weather (infiltration) contributions to the node. In this instance the Catchment area for wet weather infiltration is input in hectares.

Dry weather flow catchment area is however, NOT IN HECTARES. To reflect an instantaneous diurnal dry weather flow pattern it is necessary to input as catchment area EP divided by 10,000 ie. Catchment area input = EP / 10,000

Appropriate flow values per EP for the sub catchment together with an appropriate dimensionless diurnal temporal pattern is provided in the global storm database under Global Menu.

It is usual to use the first sub-catchment to determine dry weather flow and the second sub-catchment to estimate both direct and infiltration wet weather flow.