Nodes and Structures Editor

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The “Nodes and Structures” editor makes it possible to define the elements 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:

Identification - General identification and location information

MOUSE model data - Model related data

Basin Geometry - Geometry information

Q-H relation and Outlet head loss - Q-H relations and information on the head loss approach and coefficients

2D overland flow - used for coupling to 2D flood (requires MIKE FLOOD license, see separate description on the 2D overland flow chapter)

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 approximated as a free overflow over the crest at a given level and with a "conceptual" 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.

Identification group

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 specified 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 connection 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.	-	-

MOUSE model data group

Table 3.2 The edit fields in the MOUSE model data group

Edit field	Description	Used or required by simulations	Field name in datastructure
Node type	MOUSE Node Types: 1. Manhole - node with shaft and chamber storage 2. Basin 3. Outlet - node where water leaves the system (no storage) 4. Storage node	Yes	TypeNo
Diameter	Diameter of the manhole - not enabled for any other node types	Yes	Diameter
Ground level	Ground level of the node	Yes	GroundLevel
Bottom level	The bottom level of the manhole	Yes	InvertLevel
Critical level	User defined critical level. Used in result presentations and in the Pipe Design module	Yes	CriticalLevel
[Tickmark]	Activates the inlet delimiter function	Yes	InletControlNo
Max. Inflow	Value of maximum possible inflow into the node from runoff	Yes	MaxInlet
Cover sub-group
Type	Choose among available types: 1. Normal 2. Sealed 3. Spilling	Yes	CoverTypeNo
Buffer pressure	Buffer pressure is only active for type = spilling. Equal to the pressure above the ground level needed to cause spills from the manhole	Yes	BufferPressure
Spill coeff.	Spill coefficient is only active for type = spilling. Controls the spill capacity	Yes	SpillCoeff
Basin geometry sub group
ID	Reference to a tabulated area-elevation function for the basin geometry. The H-column for the basin geometry can start at any value, e.g. 0.0 for interpretation of H as depth in the basin. The MOUSE Engine will associate the first H-value to the bottom level of the node.	Yes	GeometryID
Q-H relation sub group
[Tickmark]	Switch for choice of the comp. method for hydraulic conditions at the outlet, in a manhole or basin. When toggled on uses Q-H tabulated function, toggled off calculates on the basis of water level (see note below this table)	Yes	QHTypeNo
[Text string]	Reference to a tabulated Q-H relation	Yes	OutletQHID
Outlet head loss sub group
ID	Reference to a head loss parameter set	Yes	LossParID
Method	Method selected for the actual head loss parameter set	-	-
Use local data	Switch for use of local head loss data	Yes	LossParNo
Coeff.	Locally defined interpretation of head-loss coefficient. Km="shape coefficient", Cont. HLC=outlet contraction head losshead loss coeff. (relative to velocity head) , Total HLC = outlet total head losshead loss (relative to velocity head)	Yes	LossTypeNo
[Field next to coeff field]	Local value of loss coefficient	Yes	LossCoeff
Eff. flow area	Locally defined choice of method for the calculation of wetted area	Yes	EffAreaNo

Q-H relations for nodes

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.

Outlet head loss

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.