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=Introduction=
This post provides a modelling example for a 1D pump using a fixed flow rate and pump curve. For this example we will set up a pump in two common situations (2D-2D & 1D-2D).
 
=Pump Attributes=
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>
In the 1d_nwk layer, the following attributes are required:<br>
#ID = ID of the pump channel. <br>
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=Estry Control File Setup=
Within the *.ecf the following commands and files are at a minimum required to run a pump with no logicallylogical controlcontrols:<br>
<font color="blue"><tt>Read GIS Network</tt></font> <font color="red"><tt>==</tt></font><tt>..\model\mi\1d_nwke_xxxxx.MIF</tt><br>
<font color="blue"><tt>Depth Discharge Database</tt></font> <font color="red"><tt>==</tt></font><tt>..\bc_dbase\xxxxx.csv</tt><br>
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=TUFLOW Operating Control File (.TOC)=
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>
 
.ecf command required: <br>
 
<font color="blue"><tt>Read Operating Controls File</tt></font> <font color="red"><tt>==</tt></font><tt> xxxxx.toc</tt><br>
 
;Useful Forum Posts
[http://www.tuflow.com/forum/index.php?/topic/1602-operational-pump/#comment-4028 Operational pumps with logic less than zero].
 
=Depth Discharge Database=
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 [[TUFLOW_Message_1118 | <font color="red"><tt>ERROR 1118 - 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 <font color="red"><tt>Error 1092</tt></font><tt></tt> and <font color="red"><tt>Error 1093</tt></font><tt></tt> will appear. <br>
==Pump Curve==
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[[File:depth-discharge_pump.PNG |border|500px]] <br>
 
Once you have your manufacturer curve for your given pump it is now necessary to create the curve .csv for TUFLOW to read in. The manufacturer specifications will need to be translated into a total head vs pump rate chart. Although reading in the depth discharge database is the same process as other boundary conditions within TUFLOW, the curve itself is fundamentally different as you no longer need to start the csv file with 0,0. If the curve did start at 0,0 this would not make sense because at a total head difference of 0m the pump should effectively be operating at peak performance so the flow rate would be greater than 0 m3. This is why builds prior to 2015 cannot be used with pump curves as it still requires csv dbase entries to start at 0,0. The image below shows a csv file for the pump performance curve given in the previous section. <br>
<br>
[[File:Pump_curve_csv_example.png|border|600px]] <br>
 
==Using a Pump Curve in a TUFLOW Operating Control (TOC) File==
 
With the pump curve defined in the depth-discharge database it can either be specified 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.
 
<font color="blue"><tt>Define Pump Control</tt></font><font color="red"><tt> ==</tt></font> Pump_1
<font color="blue"><tt>Pump Capacity</tt></font><font color="red"><tt> ==</tt></font> pump_1
HU <font color="red"><tt>==</tt></font> H1D Pump1.1
<font color="blue"><tt>If </tt></font>HU <= 2.25
<font color="blue"><tt>Pump Operation</tt></font><font color="red"><tt> ==</tt></font> Off
<font color="blue"><tt>Else if</tt></font> HU > 2.25 <font color="blue"><tt>AND</tt></font> HU < 2.75
<font color="blue"><tt>Pump operation</tt></font><font color="red"><tt> ==</tt></font> <font color="blue"><tt> No Change </tt></font>
<font color="blue"><tt>Else if</tt></font> HU <font color="red"><tt>>=</tt></font> 2.75
<font color="blue"><tt>Pump Operation</tt></font><font color="red"><tt> ==</tt></font> On
<font color="blue"><tt>End if</tt></font>
<font color="blue"><tt>End define</tt></font>
 
=1D Result File=
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Any further questions please email TUFLOW support: [mailto:support@tuflow.com?Subject=TUFLOW%201D%20pumps%20help support@tuflow.com]
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