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This GIS layer contains information on the 1D pits for the simulation.<br>
The values for the 1D tabular boundarypit data (e.g. time-series) can be found in the [[Check_Files_1d_pit_inlet_tables |_1d_pit_inlet_tables_check.csv file]] file.<br>
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'''Attributes of pit_A_check'''<br>
! style="background-color:#005581; font-weight:bold; color:white;" width=75%| Attribute Description
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| ID||The channelpit ID.
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| Type||The channelpit type, see TUFLOWthe <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW Manual]</u> for a list of channelpit types.<br>
For example ana '''"SQ"''' typestands channelQ ispit, while a standard open channel, an '''"RQ(VPI)"''' type channel is a rectangularVirtual Pipe culvertInlet.
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| VP_Network_ID|| Virtual Pipe Network ID (as an integer) used to determine which outlet(s) the flow into the inlet pits discharges from.
| Ignore||If the channel is being ignored (the ignore attribute is set to true on the input 1d_nwk file).
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| Inlet_Type||For a VPI or Q pit, the name of a pit inlet type in the Pit Inlet Database. Not used for other pits.
| UCS||The "Use Channel Storage at Nodes" (UCS) setting for the channel. If set to "T" the channel is contributing to the nodal area tables of the connected nodes.
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| VP_Sur_Index||Only used for VPI pits if using the HPC solver. In the event that the total flow into the VPIs on the same VP_Network_ID exceeds the maximum outflow capacity (see Qmax below), one or more of the VPI flow rates must be modified. The VPIs with the lowest surcharge index are given priority.
| Len_or_ANA||The length of the channel. <br>
This can be mapped or selected in GIS to highlight areas where the channels are very short. Short channels (particularly open channels) can drive down the required timestep or introduce stability issues.
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| VP_QMax||Only used for VPI and VPO if using the HPC solver. For VPOs the maximum flow that can discharge back into the 2D domain. For VPIs the maximum surcharge capacity or flow back on to the 2D domain. To prevent a VPI from surcharging enter a QMax of 0.0 (zero).
| n_nF_Cd||The Manning’s n value of the channel (for Blank, C, G, I, R, S Channel Types) or Discharge Coefficient (for RG, SG, SP Channel Types).
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| Width||For C pits the diameter of the pit cross-section in the vertical plane. For R and W pits, the width of the pit section in the vertical plane. For all pits the width is used to determine the number of 2D cells to connect.
| US_Invert||The upstream invert for the channel.
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| Conn_2D||Used to control the connection type. For pits this field must be blank or set to “SX”. If set to blank, is treated as a SX connection.
| DS_Invert||The downstream invert for the channel.
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| Conn_No||Overwrite the automatically determined number of connected 2D cells.
| Form_Loss||Any additional form loss applied for the channel. For B channels this can vary with height and this data is in the .eof file.
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| pBlockage||The percentage blockage (%) of the channelpits. Reduces the flow capacity through the pit by the specified amount.
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| Inlet_TypeNumber_of||The inletnumber typeof for a pit channelpits.
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| Lag_Approach||Sets the lag approach. <br>
| Conn_1D_2D||The 1D/2D connection type for a pit channel.
*'''None''' or blank: No lag is applied.
*'''Shift''': Shift method applied.
*'''Decay''': Decay method applied.
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| Lag_Value||Lag value in hours.
| Conn_No||The connection number for a pit channel.
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| Invert||The elevation from the 2D cell the pit connects to or that entered via a 1d_nwk layer.
| Width_or_Dia||The width or diameter of the channel if specified on the 1d_nwk layer. For a channel with a cross-section this is output in the [[Check_Files_1d_hydroprop | 1d_hyroprop_check file]].
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| Q_factor||This is the multiplication factor applied to the discharge to allow for any blockage and/or if Number_of pits is greater than 1.
| Height_or_WF||The height or weir factor for the channel (if used).
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| i_1d_nwki_1d_layer||The integer index toof the inputGIS layer that hasthe createdpit thecame manholefrom. For example an '''i_1d_nwk ''' value of 4 would be the 4th input layer (1d_nwk_M08_pits_001) below.<br> ▼| Number_of||The number of channels.
<font color="blue"><tt>Read GIS NetworkPits </tt></font> <font color="red"><tt>==</tt></font><tt> mi\1d_nwk_M07_trunk_998.MIF1d_nwk_M04_pits_001_P</tt><br> ▼|-
<font color="blue"><tt>Read GIS NetworkPits </tt></font> <font color="red"><tt>==</tt></font><tt> mi\1d_nwk_M05_bridge_001.MIF1d_nwk_M05_pits_001_P</tt><br> ▼| HConF_or_WC|| Height contraction coefficient for I and R type channels. For new weir channels if weir coefficient Cd, refer to manual for details on weir equations.
<font color="blue"><tt>Read GIS NetworkPits </tt></font> <font color="red"><tt>==</tt></font><tt> mi\1d_nwk_M04_channels_001.MIF1d_nwk_M07_pits_998_P</tt><br> ▼|-
<font color="blue"><tt>Read GIS NetworkPits </tt></font> <font color="red"><tt>==</tt></font><tt> mi\1d_nwk_M08_pits_001.MIF1d_nwk_M08_pits_001_P</tt> ▼| WConF_or_WEx||Width contraction coefficient for C, I and R type channels. For new weir channels if weir flow equation exponent Ex, refer to manual for details on weir equations.
|-}
| EntryC_or_WSa||Entry loss coefficient for C, I and R type channels. For new weir channels if weir submergence factor "a", refer to manual for details on weir equations.
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| ExitC_or_WSb||Exit loss coefficient for C, I and R type channels. For new weir channels if weir submergence factor "b", refer to manual for details on weir equations.
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▲| i_1d_nwk||The index to the input layer that has created the manhole. For example an '''i_1d_nwk''' value of 4 would be the 4th input layer (1d_nwk_M08_pits_001) below.<br>
▲<font color="blue"><tt>Read GIS Network </tt></font> <font color="red"><tt>==</tt></font><tt> mi\1d_nwk_M04_channels_001.MIF</tt><br>
▲<font color="blue"><tt>Read GIS Network </tt></font> <font color="red"><tt>==</tt></font><tt> mi\1d_nwk_M05_bridge_001.MIF</tt><br>
▲<font color="blue"><tt>Read GIS Network </tt></font> <font color="red"><tt>==</tt></font><tt> mi\1d_nwk_M07_trunk_998.MIF</tt><br>
▲<font color="blue"><tt>Read GIS Network </tt></font> <font color="red"><tt>==</tt></font><tt> mi\1d_nwk_M08_pits_001.MIF</tt>
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| pSlope||Percentage slope of the channel. A positive slope indicates the upstream invert invert is higher than the downstream invert. For a negative value this indicates that the channel has an adverse slope.<br>
This can be mapped or selected in GIS to highlight areas where the channels may be unrealistically steep.
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