Nodes and Structures Editor

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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:

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 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.

Identification group

Table 3.1 The edit fields in the Identification group

MOUSE model data group

Table 3.2 The edit fields in the MOUSE model data group

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.