1D Pumps: Difference between revisions

A pump needs to first be digitised in a 1d_nwke layer. The direction of the polyline must go from inlet to outlet as a pump is unidirectional (see Section 5.9.2.1 Pumps). The attributes required for a pump in your 1d_nwk layer can be found withinin the 2018<u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW manualManual]</u>.<br>

Because pumps are zero length channels they do not create automatic nodes at the upstream and downstream end. If you ran the model with just a pump polyline and SX connection you will get <u>[[TUFLOW_Message_1353| <font color="red"><tt>ERROR 1353 - No NA data for Node]]</tt></font><ttu>.</tt>]] To remove this error, the most efficient schematisation is to digitise a 1d_nwk 'NODE' at the upstream and downstream end of the pump (no need for a separate 2d_bc SX layer). The 'NODE' requires a nominal storage amount in the “Len_or_NA” attribute, in addition infill 'SX' into the "Conn_1D_2D" attribute to connect the 1d pump to the 2D domain. SX connections are required at connections to 2D domains to transfer water from the 1D node to the 2D. Without the SX connection, water will build up within the node and cause an instability. See the example below.<br>

Within the *.ecf the following commands and files are at a minimum required to run a pump with no logicallylogical controlcontrols:<br>

If you do not specify a Depth-Discharge database then you will be faced with <font color="red"u><tt>ERROR[[TUFLOW Message 1118 –| CouldERROR not find a y-Q curve1118]]</tt></font><ttu>.</tt><br>

For guidance on setting up the operating controls for pumps, seerefer sectionto 5the <u>[https://docs.9tuflow. in the com/classic-hpc/manual/latest/ TUFLOW Manual]</u>. <br>

The depth discharge database is set up in the same way as a pit inlet database, see(refer 5.12.4 into the <u>[https://docs.tuflow.com/classic-hpc/manual/latest/ TUFLOW manualManual]</u>). Each pump ‘Inlet_type’ must reference a name within the depth discharge database, otherwise <u>[[TUFLOW_Message_1118 | <font color="red"><tt>ERROR 1118]]</u> - Could not find pit inlet type ",a," in the pit inlet database</tt></font><tt></tt>]]. The ‘Area (m2)’ column is the area of the pump offtake and ‘Width (m)’ column is the width of the pump offtake. Without information in the Area(m2) or Width(m) columns in the depth discharge database <fontu>[[TUFLOW color="red"><tt>ErrorMessage 1092|ERROR 1092]]</tt></font><tt></ttu> and <font color="red"u><tt>Error[[TUFLOW Message 1093|ERROR 1093]]</tt></font><tt></ttu> will appear. <br>

With the pump curve defined in the depth-discharge database it can either be definedspecified within the pump 1d_nwk fields in the inlet_type field, for non-operational pumps, or it can be defined with the TOC file, for operational pumps. When defining with a TOC file, the pump curve is defined at the top of the structure control definition block and then the subsequent rules can turn the pump on/off. See the below TOC structure control definition for an example. In this case, the pump curve is used when the pump switches on once upstream water levels reach 2.75m AD. The pump curve is then used until the upstream water levels are reduced to 2.25m AD at which point the pump is switched off.