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The following nodes are available in MUSIC X.
Broadly, these nodes can be divided into 3 categories; Source Node, Treatment Nodes and Other Nodes.
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The Drainage Link, as its name implies, links flows from one node to the next downstream node. To create ,
To create a a drainage link between two nodes:
- Hover your mouse over the start node until you see a green target symbol.
- Left click and move your mouse to the end node for the link.
The first line you created will be the Primary drainage
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link. If you create another drainage
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line from the same node going to some other nodes, that will be created as Secondary drainage link.
Editing Drainage Link Properties describes the available drainage link properties in more detail, including the provision to specify flow-routing properties at each drainage link.
'Secondary' drainage links are optional. Secondary links are only required if you want to take advantage of the split flow functionality provided by MUSIC X, which is discussed next.
Split flows
MUSIC X incorporates a facility to allow outflow components from source and treatment nodes to be routed via different flow pathways. This allows, for example, the routing of surface flows and groundwater/infiltrated flows via different treatment pathways.
If you setup a MUSIC X project with just 'Primary' drainage links, MUSIC will automatically route all default outflow components to the next downstream node (as defined by the 'Primary' drainage link). If you wish to route any default or other non-default outflow components via an alternate pathway, it will be necessary to use 'Secondary' drainage links.
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- Secondary drainage links can only be created from Source and Treatment node types.
- You must specify a primary outflow link and at least one inflow link before you can add a secondary drainage link from a node. Only one primary outflow link can be added for each node but multiple secondary outflow links can be added to each node. Specifically, the number of outflow links is limited to the number of outflow components for a particular note. For example, if a node has five different outflow components, then a maximum of five outflow links can be created (i.e., one outflow component per link).
- The arrangement of drainage links must not create any "closed drainage loops" (an error message will be displayed if this occurs).
- When Once you create a secondary drainage link, you can edit the link . The properties dialog should automatically appear allowing allow you to select which outflow component you would like to associate with that link (as shown below). More than one secondary outflow link can be added to each node (up to the limit mentioned above) and more than one outflow component can be assigned to each link, if desired. If you hold down the shift key while selecting the secondary link from the drop down box, you will be able to create multiple secondary links and the automated link property dialog "popup" will be suppressed.
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- You will not be able to switch off any of the default flow components from the primary drainage links (e.g., pipe flow, weir flow etc). This ensures that all default flow components are always routed downstream (so water does not disappear!). You will not be able switch on any of the non-default outflow components via the primary drainage links (e.g., infiltration, reuse, ET etc). These non-default flow components can only be added via the secondary drainage links.
- Any of the available flow components can be added and removed via secondary drainage links. MUSIC will ensure that only one flow component is shared between all outflow links for a particular node. So, for example, if you add "Pipe flow" to a secondary link it will be removed from the primary drainage link.To see what outflow components are currently associated with a particular link without opening the link properties dialog, just run the cursor across the link and they will be displayed as a tooltip/hint.
Creating nodes and links
There are a few simple rules which you should be aware of in creating nodes and links within MUSIC:
- There are separate source nodes for urban, agricultural and forested sub-catchments. Each of these three source nodes has its own default discharge pollutant concentrations. Therefore, to represent a sub-catchment made up of differing component land-uses, you must create separate source nodes to represent each of these dominant land-uses.
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- Each catchment file can have only one receiving node, though the pre and post development nodes can be used in conjunction with one receiving node. A receiving node is not necessary in the model, but becomes a useful reference point in most models as representing the ultimate outlet.
- A source node or treatment node can have only one link downstream of it.
- Source nodes must be between 0.01ha 001ha and 10,000ha (ideally the lower limit of source node area should be 1ha).
- Realistic bounds on size and other design parameters are also specified for treatment nodes.Drainage links can be specified with or without routing (specified using the Edit Properties menu-item in the context-sensitive menu for that node). Additional rules regarding the creation of primary and secondary drainage links can be found here
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