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You can edit the properties of the source node by:The mixed Zoning/Surface type values are adapted from the same sources as the Agricultural and Forest source nodes 

You will then be presented with a series of five dialogue boxesbox, each of   which contains different tabs containing parameters regarding the hydrologic and water quality characteristics of the source node.

Navigating Through the Dialogue Boxes

At the bottom of each dialogue box you will find three buttons that allow you to move forward or backwards through the five dialogue boxes. You can edit any of the data presented on the active dialogue box. The buttons and their operation are described below:

Button	Action
Image Removed	Activates the next dialogue box for editing.
Image Removed	Activates the previous dialogue box for editing.
Image Removed	Cancels the editing session. Selecting this button on any of the dialogue boxes will terminate the editing session and all changes made to data on any of the dialogue boxes will be discarded.
Image Removed	Ends the editing session. All changes made to the parameters displayed on any of the dialogue boxes will be accepted. The Finish button is displayed on the fifth dialogue box.

Source Node Dialogue Box, Page 1 of 5

The first dialogue box displayed contains the location name, the total area, and the proportions of impervious and pervious area for that source node. For Urban Source nodes, it also displays the zoning/surface type. 

The Image Removed button allows you to record any important details or assumptions for the source node (for example, you may provide an explanation of how the impervious area was calculated).

Location

The location name will be displayed under the source node icon on the main worksheet. You may change the default location name to a more descriptive name if you wish.

Total Area

Enter the total area of this source node in hectares.

The area information forms part of the input to MUSIC’s rainfall runoff model, derived from a model developed by the CRC for Catchment Hydrology (Chiew & McMahon, 1997). For a diagram of the model structure and a brief description of its operation, see Appendix A: Rainfall-Runoff Modelling. Further guidance on setting appropriate parameters for the rainfall runoff model is contained in the Appendices, especially for parameters specific to particular regions.

Zoning/Surface Type

For Urban source nodes, select the zoning or surface type. This will change the water quality parameters used in the generation of pollutants from the source node to values appropriate for that zoning or surface type. These values are displayed on pages 3, 4 and 5 of the Wizard. See below for more details. 

Pervious and Impervious Proportions

To edit the proportions of impervious and pervious areas, left click and drag the bars on the graph. The percentage value will be changed in increments of 1%.

Import Flow

This checkbox allows you to import flow time series data, resulting in the stochastic generation of constituents. Note that you must set up the pervious and impervious proportions prior to importing the time series.

Enabling this checkbox expands the dialog box so you can import the time series using the Flow Time Series Import Wizard. In the wizard, you can choose which column of the file represents various types of flow.

These are then listed in the respective fields below.

The Catchment Area for GP Loads represents the area of the catchment.

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The Image Removed button allows you to save flux data (as daily or sub-daily) from the source node - such as levels in each of the soil stores, magnitudes of baseflow, throughflow and surface runoff, etc. Clicking the Fluxes button will bring up the dialogue box shown below, prompting you for a location to save the file to, and a name for the file. The text file produced can be opened in a spreadsheet, text editor, or statistics package, for further interpretation and analysis. Note that flux files can be very large.

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When allocating flux files and importing fluxes, ensure that Flux flow units are set up in m3/s. If you choose mm and then specify an import flux file, you will be notified of an automatic unit change with the following dialog box:

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Runoff Generation Parameter Dialogue Box, Page 2 of 5

The second dialogue box displayed contains the hydrologic parameters used by the rainfall runoff model. For more information on model structure, operation and suggested parameter ranges see Rainfall Runoff Modelling. Note that if a flow time series file has been imported, these parameters will not be editableYou can click on any tab and  can edit any of the data presented on the active dialogue box. 

The Source Tab contains Land Use/Zoning type, the total area, the percentage of impervious and pervious area for that source node. It also contains the hydrologic parameters used by the rainfall runoff model. For more information on model structure, operation and suggested parameter ranges see Rainfall Runoff Modelling.

Land Use/Zoning Type

For source nodes, select the zoning or surface type. This will change the water quality parameters used in the generation of pollutants from the source node to values appropriate for that zoning or surface type.  See below for more details. 

Total Area

Enter the total area of this source node in hectares.

The area information forms part of the input to MUSIC’s rainfall runoff model, derived from a model developed by the CRC for Catchment Hydrology (Chiew & McMahon, 1997). For a diagram of the model structure and a brief description of its operation, see Appendix A: Rainfall-Runoff Modelling. Further guidance on setting appropriate parameters for the rainfall runoff model is contained in the Appendices, especially for parameters specific to particular regions.

Pervious and Impervious Proportions

To edit the proportions of impervious and pervious areas, type the percentage of impervious/pervious area. Change in one will automatically adjust the other making the sum 100%.

Impervious Area

The impervious area has depression storage only and no infiltration, and quickly produces surface runoff during an event. Water in depression storage is lost to evapotranspiration daily.

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Each component of runoff is calculated using the information above and a daily time-step. Each component is then disaggregated to the required time-step, using the detailed rainfall pattern and a technique appropriate to that component. For more information on disaggregation see Appendix A: Rainfall-Runoff Modelling.

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Water Quality Parameter Dialogue Boxes

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The third, fourth and fifthe dialog boxes contain the water quality parameters used in the generation of pollutants from the source node. Each dialog box is devoted to one of the pollutants modelled:

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The default values displayed for Mean and Standard Deviation (Std Dev) for both base flow and storm flow (Table 1) are adapted from a range of sources, particularly Duncan (1999) and are discussed in more detail in Urban Runoff Generation. Wherever possible, these values have been modified in the MUSIC6.ini file to be representative of the region in which MUSIC is being applied. 

 

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Image Modified Tip Box You can modify the pollutant concentrations as desired, by changing the values displayed in the Mean and Std Dev boxes. You can restore the default values of Mean and Standard Deviation for a flow component at any time by selecting the Restore Defaults button for that component. You can change the default values for these parameters in the Catchment Defaults dialog (on the Settings tab, select Defaults and then Edit).

 

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ZoningSurfaceTypes ZoningSurfaceTypes

Urban Zoning/Surface Types

For Urban source nodes, each zoning/surface type has appropriate base flow and storm flow pollutant concentrations for that zoning (eg. rural residential) or surface type (eg, sealed roads, unsealed roads). The Zoning/Surface Type is selected on Page 1 of the Wizard, and changes the default values displayed on pages 3, 4 and 5. Prior to MUSIC version 6.2, MUSIC had three source nodes, Urban, Agricultural and Forest. The 'mixed' Zoning/Surface type contains the same pollutant concentration parameters as the prior default 'Urban' values. For all other Zoning/Surface types, the pollutant concentration parameters are Sydney Catchment Authority (2012).

Table 1. Default pollutant concentrations for each source node

 

Source Node Type	Zoning/Surface Type	Pollutant Concentration (log mg/L)
		Total Suspended Solids				Total Phosphorus				Total Nitrogen
		Base Flow		Storm Flow		Base Flow		Storm Flow		Base		Storm
		Mean	Std Dev	Mean	Std Dev	Mean	Std Dev	Mean	Std Dev	Mean	Std Dev	Mean	Std Dev
Agricultural	-	1.40	0.13	2.30	0.31	-0.88	0.13	-0.27	0.30	0.074	0.130	0.59	0.26
Forest	-	0.90	0.13	1.90	0.20	-1.50	0.13	-1.10	0.22	-0.14	0.13	-0.075	0.240
Urban	Mixed	1.10	0.17	2.20	0.32	-8.20	0.19	-0.45	0.25	0.32	0.12	0.42	0.19
	Roof	1.10	0.17	1.30	0.32	-8.20	0.19	-0.89	0.25	0.32	0.12	0.30	0.19
	Sealed Road	1.20	0.17	2.43	0.32	-8.50	0.19	-0.30	0.25	0.11	0.12	0.34	0.19
	Unsealed road	1.20	0.17	3.00	0.32	-8.50	0.19	-0.30	0.25	0.11	0.12	0.34	0.19
	Eroding gullies	1.20	0.17	3.00	0.32	-8.50	0.19	-0.30	0.25	0.11	0.12	0.34	0.19
	Revegetated land	1.15	0.17	1.95	0.32	-1.22	0.19	-0.66	0.25	-0.05	0.12	0.30	0.19
	Quarries	1.20	0.17	3.00	0.32	-0.85	0.19	-0.30	0.25	0.11	0.12	0.34	0.19
	Residential	1.20	0.17	2.15	0.32	-0.85	0.19	-0.60	0.25	0.11	0.12	0.30	0.19
	Commercial	1.20	0.17	2.15	0.32	-0.85	0.19	-0.60	0.25	0.11	0.12	0.30	0.19
	Industrial	1.20	0.17	2.15	0.32	-0.85	0.19	-0.60	0.25	0.11	0.12	0.30	0.19
	Rural residential	1.15	0.17	1.95	0.32	-1.22	0.19	-0.66	0.25	-0.05	0.12	0.30	0.19

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Image Modified Tip Box The default urban parameters were the basis for guidelines such as the Victoria Stormwater Committee (1999) BPEM Guidelines : Stormwater. It is generally recommended that these are adopted when modelling for the purposes of demonstrating compliance with this guideline. This is because using other landuse/surface types will result in larger/smaller treatment systems being required. The percentage reductions set in the guidelines combined with the 'diminishing returns' effect as concentrations decrease mean that if the starting point concentrations are lower, treatment to a percentage reduction will be harder to achieve and the required treatment size will be larger. Conversely, higher concentrations will typically require a smaller treatment system.

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Image Modified Tip Box The Mean and Standard Deviation values displayed in the text boxes are displayed as the Log of the concentration in mg/L. Concentrations in the normal domain are displayed on the schematic distribution graphs on the dialogue box.

 

 There are two options available for defining pollutant concentration in both the surface and baseflow components of the runoff:

• Mean: A constant value set at the value displayed in the Mean text box; or
• Stochastically Generated: A stochastically generated concentration whose mean and standard deviation will be consistent with those displayed in the Mean and Standard Deviation text boxes.

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Image Modified Tip Box Changing the Mean and Std Dev of the Log concentrations in the text boxes will change the corresponding concentration values displayed on the accompanying graph.

 

When using the Stochastically generated option, the concentration at each time-step will be regenerated using a stochastic model that reproduces the mean and standard deviation of the log values displayed in the text boxes. This has been set as the default option in the model as it tends to produce a more realistic interpretation of pollutant generation from the source nodes.

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It is important to note that the autocorrelation coefficient will not significantly affect the treatment train effectiveness produced by music, but simply ensures that the variation over time in concentrations during storm events and baseflow conditions is more ‘realistic’.  Depending on the time-step and coefficient used, there can be variations in mean annual loads for the same model run on different computers, however the maximum difference is usually within 10% of the previous run.

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Image Modified Tip Box Serial correlation (also called autocorrelation) is the correlation between pollutant concentration at time t, and the previous time-step, t-1. music does not model autocorrelation for lag periods of more than one time-step.

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