UND File Conversion - Nodes

Data in the [MOUSE_NODES] group of the UND file is imported into the InfoWorks ICM Nodes table. This topic contains details on the conversion of MOUSE node information to InfoWorks ICM.

Nodes Group - [MOUSE_NODES]

MOUSE	Description	InfoWorks ICM Data Field
NODEID	Node name	Node ID
TYPENO	Type of node: TYPENO Node Type 1 Manhole 2 Basin 3 Outlet 4 Storage Node	Node Type MOUSE Node Type InfoWorks ICM Node Type Manhole Manhole Basin Storage Node Outlet Outfall Storage Node Not imported. This node type is unsupported. An error message will be displayed in the import log.
X	X coordinate	X
Y	Y coordinate	Y
DIAMETER	Diameter of Manhole node	Shaft Plan Area and Chamber Plan Area calculated as: (P x DIAMETER2)/4   MOUSE diameter is also used to calculate Weir Widthwhen importing spilling nodes. (See Note on MOUSE spilling nodes below).
INVERTLEVEL	Invert level of the manhole	InfoWorks ICM Node Type InfoWorks ICM Data Field Manhole Chamber Floor Level All other node types User Number 2 (Used to determine the Invert Level of attached conduit)
GROUNDLEVEL	Ground Level	Ground Level
WATERLEVEL	Water Level in Outlet node	User Number 3
CRITICALLEVEL	Optional parameter for manholes and basins. Does not influence computations.	Not imported as not used in computations.
OUTLETSHAPENO	Outlet Shape: OUTLETSHAPENO Shape 1 Round Edged 2 Sharp Edged 3 Orifice 4 NoCRS1 5 EnergyLoss 6 NoCRS2 7 Effective flow area1 8 Effective flow area2 9 Mean Energy approach	User Number 1 Used to determine the headloss coefficient in attached conduits. See the Links topic for further details.
DATASETID	Dataset ID for Basin geometry. Basin geometry is defined in the TABULAR DATA section.	For Basin types i.e. IW storage nodes, the Leveland Plan Area storage arrays are read from the TABULAR DATA section.
RMNODETYPENO	RMNODETYPENO Type 1 Pressure main node 2 Pressure main receiving	Not imported. Not required - the pressurised pipe is defined in the Links section.
RMPRESSURELEVEL	Pressure level. Optional parameter for a pressure main node.	Not imported. Not required - the pressurised pipe is defined in the Links section.
TOPTYPENO	Flood Type: TOPTYPENO Flood Type 1 Normal 2 Sealed 3 Spilling (See Note on MOUSE spilling nodes below)	Flood Type MOUSE Flood Type InfoWorks ICM Flood Type Normal Stored Sealed Sealed Spilling Stored A MOUSE Manhole or Basin defined as spilling will be imported to InfoWorks ICM as a series of node, weir and outfall objects. (See Note on MOUSE spilling nodes below).
BUFFERPRESSLEVEL	Buffer Pressure Level. An optional parameter for spilling nodes, the Buffer Pressure Level is the relative elevation above or below the ground surface at which spilling starts. If omitted default value = 0.0 is used.	Used to calculate InfoWorks ICM Weir Crest Level. See Note on MOUSE spilling nodes below.
RELWEIRCOEFF	Relative Weir Coefficient. Optional parameter for spilling nodes. If omitted default value = 1.0 is used.	Used to calculate InfoWorks ICM Weir Discharge Coefficients See Note on MOUSE spilling nodes below.

Note on MOUSE Spilling Nodes

In MOUSE, manholes and basins can be defined as 'spilling'.  If the water level reaches the ground level then the water spills irreversibly out of the system. The flow is computed using the free overflow formula as follows:

(1) Where: Qspill= spill discharge, m3/s B = conceptual spill width, m Hm= water level in the manhole, m Htop= ground level in the manhole, m DP= buffer pressure level for the spill, m g = acceleration due to gravity m/s2 t = relative weir coefficient, linear scaling coefficient for the spill

For MOUSE manholes, the spill width B equals 1.5 x the manhole diameter for water level Hm=Htop+DP.  With increasing water level, the spill width B increases exponentially to ~1000 times the manhole diameter.

For MOUSE basins, the spill width B is set equal to the square root of the basin surface area.

Importing MOUSE Spilling Nodes to InfoWorks ICM

A MOUSE node defined as 'spilling' is imported to InfoWorks ICM as a series of node, weir and outfall objects:

The InfoWorks weir equation is as follows:

(2) Where: Q0= free outfall discharge, m3/s Cd= discharge coefficient g = acceleration due to gravity m/s2 B = width of the weir, m Du= upstream depth with respect to the crest, m

The MOUSE relative weir coefficient, t, is converted to the InfoWorks ICMdischarge coefficient, Cd, by:

(3)

For InfoWorks ICM manholes:

• Flood Type will be set to Stored
• Weir width will be assigned the MOUSE manhole diameter x 1.5.  Note: the effect of increasing spill width with increasing flow will have to be modelled independently by the user.
• Weir crest will be assigned the MOUSE manhole ground level + the MOUSE Buffer Pressure Level

For InfoWorks ICM storage nodes:

• Weir width will be assigned the square root of the MOUSE basin surface area:

SQRT [(Px DIAMETER2)/4]

• Weir crest will be assigned the MOUSE basin ground level + the MOUSE Buffer Pressure Level