Additional/Optional Channel Flags
Non-inertial channel
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N
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Normal and gradient channels can be specified as non-inertial by including a “N” in the Channel_Type attribute. A non-inertial channel has the inertia term suppressed from the momentum equation.
Note: Prior to Build 2002-08-AC this flag was “S”. Any models with channels using this feature will have to have “S” flags changed to “N”.
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Uni-directional (all channels)
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U
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Any channel can be defined as uni-directional by including a “U” in the Channel_Type attribute. Water will only flow in the positive direction of the channel.
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Variable Geometry
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V
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Normal and gradient channel cross-sections can vary over time by using a variable channel definition. Include a “V” in the Channel_Type attribute and see Section 3.14.4.5 for more details.
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Weir over the Top
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W
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If a “W” is specified in conjunction with a B, C or R channel (eg. BW, CW or RW), a weir channel is automatically inserted to represent the flow overtopping the structure. This saves having to digitise the weir separately. To use this option requires adding the 10 optional attributes to the 1d_nwk layer as detailed in Table 4 .11. Some of these attributes are used to specify the weir parameters. Available at Build 2005-05-AN.
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Use Upstream Cross-section
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