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Introduction

A new custom outflow and storage interface has been included in MUSIC. It allows the outflow and storage characteristics of selected Treatment Nodes to be fully customised.

Using the Custom Outflow/Storage Interface

To access the custom outflow and storage interface, open the node properties dialog and click Custom Storage Outflow Tab, then check the User Custom Storage Discharge Curve, as shown below (if this check box is not displayed, the selected node does not support custom outflow and storage). This dialog shows the relationship between Flow and Height, which is automatically modified to accommodate the same pipeflow entries for the varying heights. This is described in further detail next.

Data range

The measurement of "Height" data starts from "Pipe Flow" outlet level. In other word the "Height" is zero at "Pipe Flow" outlet level, which is the surface level of permanent pool (see conceptual diagram of the storage unit). The "Height" data must cover the range starting from zero at the permanent pool's surface level to 2m above the "overflow weir level". For example, if the "Extended Detention Depth (EDD)" is 0.35m, the "Height" data range should be 0 - 2.35m.

Description of Dialog Buttons/Functionality


This radio button is used to define whether the selected outflow relationship will be used in isolation or will be combined with the default pipe and weir outflow calculated by MUSIC:

  • ‘...replaces standard outflow’: If selected, only the custom outflow relationship will be used to describe the outflow characteristics for the node. The pipe and weir properties specified on the ‘Outlet Properties’ will not be used.
  • ‘...adds to standard outflow’: If selected, the custom outflow relationship will be combined with the outflow generated by the pipe/weir characteristics as defined in the ‘Outlet Properties’ section of the node properties dialog.

Note that this radio button selection only applies to the outflow. The custom storage relationship specified on the custom storage tab will always be used to define the storage characteristics of the node.

The Pipe Flow, Weir Flow and Storage tables allow custom data points to be entered / modified directly.

 Removes all data from the current outflow/storage relationship.

When this button is pressed, MUSIC will extract outflow or storage relationships at the nominated ‘height increment’ based on the current node storage and outlet properties. A minimum height increment of 0.01m can be defined.

Different height increments can be specified for outflow and storage. That is, a constant height increment is not required for all relationships.

Allows importing of the data

Allows data from the tables to be copied and pasted into Excel.


The main chart displays the outflow and storage relationships. The relationships can be turned on or off using the check boxes in the legend at the bottom of the chart.


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