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Upstream_Invert
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Node or Pit:
Since Build 2005-05-AN, used to specify the ground elevation of the pit. This is used to set the upstream and downstream elevation of the pit channel. If no pit channel is specified, it is not used. If set to –99999, the ground elevation is set to the ZC elevation of the 2D cell that the pit falls within (provided there is a 2D SX connection – see Topo_ID below).
Prior to Build 2005-05-AN, not used.
C, G, R, S Channel_Type:
The upstream bed or invert elevation of the channel in meters. For G and S channels, if –99999 is specified, the bed of the channel cross-section is used.
Since Build 2005-05-AN, if a manually created node exists at the upstream end of the channel, and –99999 is specified, the upstream invert is set to the downstream invert specified for the node (or pit), provided this value is greater than –99999.
W Channel_Type:
For a weir (W), the maximum of upstream_invert and downstream_invert is used (in conjunction with the Diameter_or_Width attribute to define a rectangular section 5m high) only if there is no cross-section specified. If a cross-section is specified via an external source (eg. MIKE 11 cross-section database) or as a CS table, this attribute is not used and the weir invert is set as the lowest point in the cross-section.
Prior to Build 2003-03-AE, the automatic height given to a weir was 100m – if no cross-section is specified). This was changed to 5m so that automatic generation of node storage areas from channel widths were within a more realistic range of elevations. Use Depth Limit Factor to allow water levels to exceed the 5m range if required.
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