*
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The depth at a node fell below -0.1m. A WARNING is also output to the _messages.mif file. The occurrence of significant negative depths may cause mass conservation errors in the 1D domain.
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*
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One end of a normal channel is close to being dry and a transitioning algorithm was used to dry/wet the channel.
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#
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The gradient channel algorithm was applied. This occurs when one end of the channel is either dry or very shallow. The gradient channel algorithm applies a weir equation at the dry or shallow end in combination with the momentum equation by adjusting the water surface slope along the channel.
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D
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Upstream controlled friction flow occurred in a Steep (S) channel when the downstream end was dry (Build 2004-06-AA).
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S
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Upstream controlled friction flow occurred in a Steep (S) channel with a Froude Number greater than one (1).
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T
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Upstream controlled friction flow occurred in a Steep (S) channel with a Froude Number between 0.5 and one (1). T stands for Transitioning from normal flow to upstream controlled friction flow.
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N
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Upstream controlled friction flow occurred in a Steep (S) channel with a Froude Number less than 0.5. N stands for normal flow, however, in this case the upstream controlled friction flow approach was adopted. This may occur during the transitioning of flow from downstream controlled to upstream controlled. If it occurs repetitively, the configuration of the channel should be reviewed.
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Culvert Flow Regime Flag
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The culvert flow regime flag as documented in Table 4 .16. Culvert channels only.
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E
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The node is empty or dry (ie. the head or water level is at the bottom of the node). E stands for Empty.
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E
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The channel is empty or dry. E stands for Empty.
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F
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The head exceeds the top of the nodes elevation versus surface area table (NA table). F stands for Full.
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F
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The head at the mid-point of the channel exceeds the top of the channel’s hydraulics properties table (CS table). F stands for Full.
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L
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The velocity rate limit was applied to the channel to try and prevent oscillations or instabilities – non-inertial channels (structures) only. See Vel Rate Limit.
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U
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The uni-directional flag assigned to the channel was invoked and the velocity/flow was set to zero.
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