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The “Nodes and Structures” editor makes it possible to define the ele- ments used to model manholes, outlets and basins in a CS MOUSE storm and sewer collection system.
The editor organizes the related input data into the following groups:
MOUSE distinguishes between four types of nodes: circular manholes, basins, outlets and storage nodes. The same dialog is used for all four node categories, but the dialog adapts according to the selected node type.
Each node is geographically determined by 'x' and 'y' co-ordinates. The co-ordinates may be specified in any local co-ordinate system.
Manholes and basins are per default considered open at the top (Cover type equal to 'Normal'). This means, that when the water level in a node reaches the ground level, the water spills on the ground surface. In that case, MOUSE introduces an artificial basin on the top of the node, with a surface area 1000x larger than the node's surface. The surcharged water is stored in the basin, to be returned back into the sewer.
Alternatively, it is possible to specify a sealed/locked node (Cover type equal to 'Sealed'), i.e. a node with a fixed lid on the top - at the ground level - so water cannot escape although the pressure still builds up inside.
On the other hand, a node can be specified as a 'spilling' node (Cover type equal to 'Spilling'). In a spilling node, water escapes irreversibly from the model, if the water level reaches and exceeds the node's ground level (optionally set off by a 'buffer pressure level). The rate of spill is approxi- mated as a free overflow over the crest at a given level and with a „con- ceptual“ crest length. For further details, see the MOUSE Pipe Flow Reference.
If inflow to a node from catchments is limited this can be modelled by specifying the ‘Max. Inflow’ parameter for the specific node. It is possible to get the information about the volume held back at the node due to the inflow limitation by adding an entry in the ‘dhiapp.ini’ file. Please refer to the documentation on this file for further information.
In the tables given below each data variable is described shortly and if it is required as input.
Table 3.1 The edit fields in the Identification group
|Edit field||Description||Used or required by simulations||Field name in datastructure|
|Asset ID||Reference to an ID used in external data sources||No||AssetName|
|Datasource||Reference to an external data source (table ID) where the record has been imported from||No||DataSource|
|Node ID||A unique name for the node. Up to 40Y characters (letters, numbers, blank spaces and underscore characters)||Yes||MUID|
|Model||Associates the current node to a spec- ified submodel||No||SubModelNo|
|Description||User's descriptive information related to the node||No||Description|
|PM Type||Definition of the node´s role in the pressure main as the downstream point of the pressure main’s connec- tion to the network. Manholes and basins can be declared as a “Tail Node”. Please refer to the MOUSE Reference Manual (Pipe Flow) for further on pressure mains.||Yes||PMTypeNo|
|Tail level||Water level (absolute elevation) in the „receiving node“, used as lower boundary for permanently pressurized parts of the system. Please refer to the MOUSE Reference Manual (Pipe Flow) for further on pressure mains.||Yes||PMLevel|
|Status||Data status for the entire record, serves for keeping track on the source of information||No||Element_S|
|Network type||Attributes the link to a certain type of network. Used in cases when two or more different networks are included in the same project||No||NetTypeNo|
|X coordinate||X coordinate of the node position||Yes||Shape_X|
|Y coordinate||Y coordinate of the node position||Yes||Shape_Y|
|Links||Number of links going to or from the node. Non-editable value.||-||-|
Table 3.2 The edit fields in the MOUSE model data group
Specifying a Q-H relation for an outlet controls When specifying a Q-H relation for a manhole o controls infiltration to the node. The Q-H relatio between the water level in the manhole (or basin The flow (Q) value in the Q-H relation should b when water enters the node and a negative value water from the network model.
If you wish to make changes to the head loss parameter set that you have made a reference to, you can change this by accessing MOUSE|Local Head Losses … The editor is shown in Figure 3.5.