iMOD User Manual version 5.2 (html)

7.11Pumping Tool

WHY?
iMOD offers the possibility to manipulate existing model features, such as well strength, waterlevels, etc., by means of the functionalities offered by the scenario definitions. However, the scenario definitions are limited to existing features and new elements can not be added easily without changing the runfile manually. The Pumping Tool can be applied to configure new elements to an existing model configuration (runfile) and simulate and analyse the results easily. The Pumping Tool is developed specifically to simulate the effect of pumping, Aquifer-Storage-Recovery systems and/or Thermal-Heat-Storage systems.

WHAT?
Any pumping system can be outlined by defining its location, vertical screen depths and corresponding well abstraction rates. The Pumping Tool includes these properties to any existing model configuration (runfile) prior to the simulation. The Pumping Tool allocates the well strength to the appropriate modellayer(s) and extends the model simulation time to include the given well regime. After the simulation the Pumping Tool offers a quick tool to analyse the results.

7.11.1Pumping Tool - Initial Settings

The Pumping Tool needs an input file (*.INI) with initial settings. These settings are needed by the Pumping Tool to incorporate and allocate the well systems to the model(s). In the preference file the keyword SCENTOOL needs to be included that directs to that file, e.g. SCENTOOL {INSTALLFOLDER}\SCENTOOL.INI, see section 9.1. The file SCENTOOL.INI needs to contain the following parameters:

NSCNCONF	Number of Scenario Configurations. This will indicate the number of project files (*.PRJ) that will be used to incorporate the well systems, e.g. NSCNCONF=2
PRJFNAME{i}	For each of the NSCNCONF project files specify the full file name of the project file, e.g. PRJFNAME1=c:\SCENTOOL\SCEN_SUMMER.PRJ
PRJNAME{i}	For each of the NSCNCONF project files specify an alias for the project file as described by PRJFNAME{i}, e.g. PRJNAME=’Mean Summer Situation’. This alias will be displayed in the Pumping Tool.
MAXNWEL (optional)	Specify the maximum number of Well Systems in one configuration, e.g. MAXNWEL=20 (default value MAXNWEL=10).
MAXNOBS (optional)	Specify the maximum number of Observation Wells in one configuration, e.g. MAXNOBS=20 (default value MAXNOBS=10).
MAXNRES (optional)	Specify the maximum number of results in one configuration, e.g. MAXNRES=20 (default value MAXNRES=10).

Example of Pumping Tool SCENTOOL.INI file:

!## number of scenario configurations NSCNCONF=1 !## configuration 1 PRJFNAME1=D:\IMOD_TUTORIALS\TUT_SCENARIO_TOOL\MODEL_SUMMER.PRJ PRJNAME1=’MeanSummersituation’ !## configuration 2 PRJFNAME2=D:\IMOD_TUTORIALS\TUT_SCENARIO_TOOL\MEAN_WINTER.PRJ PRJNAME2=’MeanWintersituation’ !## maximum number of well systems allowed MAXNWEL=20

7.11.2Starting the Pumping Tool

Select the Toolbox option from the main menu and then choose Pumping Tool to start the Pumping Tool window. The Pumping Tool window manages the scenario configuration which is saved in the iMOD Scenario File (*.ISF), see section 9.26.

The Pumping Tool window has five tabs:

• Well Systems
This tab defines the locations of the wells and the extraction rates.
• Cut-Out Areas
(this option is not implemented) This tab defines the location of the cut-out or excavation areas.
• Observation Wells
This tab defines the locations of observation screens and the observed groundwater heads.
• Monitoring Wells
(this option is not implemented) This tab defines the location of existing monitoring wells with groundwater head time series.
• Results
This tab defines the model simulation configuration and to start the model calculation.

Pumping Tool window, Well Systems (..) tab
Pumping Tool window, Observation Wells (..) tab:

The Well Systems tab is used to define wells and the Observation Wells tab is used to define screens where the calculated groundwater head can be compared with the observed groundwater head. All functionalities of the Observation Wells tab behave similar to those described for the Wells Systems tab and for the Wells Systems window.

Scenario Project	This displays the iMOD Scenario File (*.ISF) under which the current configuration is saved.
	New Click this button to start a new/empty scenario configuration.
	Open Click this button to open an existing iMOD Scenario File (*.ISF).
	Save As Click this button to save the current scenario configuration to a new iMOD Scenario File (*.ISF).
	Save Click this button to save the current scenario configuration to the current iMOD Scenario File (*.ISF).
Well Systems	Click one of the well systems in the list to activate the Delete and Properties buttons. The Plot Information setting will be applied to the selected well system too.
	Add Click this button to add a new well system.
	Delete Click this button to remove the selected well system from the scenario configuration. Question window:
	Properties Click this button to adjust the parameters for the selected well system, see section 7.11.3.
	Save As Click this button to save the current wells to an IPF file with associated TXT files for each individual well. The extraction rates will be divided by the number of well locations, suppose a well contains out of 10 locations, the specified extraction rate will be divided for each individual location and stored in a TXT file.
Plot Information	Select one of the following options to specify the method to display information for the individual pumping locations for the selected well system (see below). • None only the specified symbol will be drawn. The symbol can be changed in the Display tab of the Well Systems window, see section 7.11.3. • Identification displays the identifications; • Screendepth displays all screen depths; • All Information displays all information available.
Apply to All	Select this option to apply the display settings to all available well systems at once.
Plot Label	Select this option to add the labels to the different parameters.
Help ...	Click this button to start the Help functionality.
Close ...	Click this button to stop the Pumping Tool. You will be asked to save your work before the Pumping Tool need to be closed.

Note: All other iMOD functionalities remain active whenever the Pumping Tool is loaded. This means that map operations can be carried out, legends can be changed, but several other tools such as the Profile Tool (see section 7.1) and/or 3D Tool can not be used without leaving the Pumping Tool.

Available Results	Display of all available result folders in the scenario project folder, e.g. folder C:\..\USER\SCENTOOL\WERKHOVEN\* for the C:\..\USER\SCENTOOL\WERKHOVEN.ISF file. The list will be refreshed whenever the tab is toggled with other tabs on the Pumping Tool window.
	Add Click this button to start a new simulation.
	Delete Click this button to delete the selected result in the Available Results list. You will be asked to confirm this action, since all files for the selected result will be deleted from disk.
	Quick Open Click this button to start the Quick Open window and specify the results that need to be displayed, see section 6.2.
	Graph Click this button to display the selected result in combination with observation wells. Therefore, this button is only available whenever Observation Wells are defined. Graph window: See section 6.6.1 for more information on the use of the available functions of this window. In this graph window a drop-down menu is added. The graph is updated whenever another item (Observation Well) is selected from the dropdown menu.

7.11.3Well Systems Observations

Select the Add or Properties button on the Well Systems tab on the Pumping Tool window, to display the Well Systems window.

Note: All functionalities of the Observation tab behave similar to those described for the Extraction Rates tab on the Wells Systems window, however, a few remarks are needed.

Well System name	Enter the name of the well system, maximum 24 characters.
Date	Select this option to enter the extraction rates by their (start)date, the Start Date column in the table will become enabled to enter values. The values within the Duration column will be computed, automatically.
Duration, start from (dd/mm/yyyy)	Select this option to enter the extraction rates by specifying an initial date, e.g. 20/5/2011. The column Duration becomes enabled to enter the duration for each extraction rate, e.g. 7.0, 7.0, 14.0 and 7.0 days. The date within the Start Date column will be computed automatically whenever the Calculate button is clicked or when closing the window.
Table	Each row in the table expresses an extraction rate for the entire well system. The red coloured column can not be edited and is computed whenever the Calculate button is clicked. Enter the extraction rates (strength) in the third column in m\({}^{3}\)/hr (during the actual modeling, those values will be translated on the background into m\({}^{3}\)/day). The last column (Julian) is not editable and is use by iMOD internally.
	Open Click this button to open a plain text file that contains date and extraction rates. Example of a text file with extraction data `date[yyyymmdd],q[m/hr] 20110918,-10.0000000 20110923,-25.0000000 20110928,-50.0000000 20111008,-125.0000000 20111023,-60.0000000 20111028,-10.0000000 20111102,0.0000000 20111107,-99999.0000000`
	Save As Click this button to save a plain text file that contains date and extraction rates.
	Calculate Click this button to compute the Start Date or Duration column in the table.
	Graph Click this button to display a bar diagram of the extraction rates (see section 6.6.1 for more information on the use of the available functions of this window). Graph window:

Help …	Click this button to start the Help functionality.
Close …	Click this button to close the Well Systems window. You will be asked to save any adjustments or you can cancel closure.

Well Systems window, Position of Filters tab:

Symbol	Select a symbol number (see section 5.7 for available symbols). The current symbol is displayed on the right.
Colour	Displays the current symbol colour (dark green in this example).
	Colour Click this button to change the colour by means of the default Windows Colour window.

7.11.4Results

Select the Add button on the Results tab on the Pumping Tool window, to display the Compute Result(s) window.

Version Number	Enter a version number. The version number will be added to the result folder that is formed by the name of the model configuration, e.g. V1_{modelconfiguration}.
Select (multiple) type of Simulation Configurations	Select one or more model configurations from the list. The list is reflecting the content of the parameter RUNNAME{i} in the initialization file for the Pumping Tool. It is an alias for the runfile described by the keyword RUNFNAME{i].
	Info Click this button to edit the i\({}^{th}\) selected runfile (RUNFNAME{i}) that is associated to the alias (RUNNAME{i}) from the list.
	CheckRun Click this button to check the content of the i\({}^{th}\) selected runfile (RUNFNAME{i}) that is associated to the alias (RUNNAME{i}) from the list. More information about this kind of runfile check.
Local GridSize (m)	Enter the gridsize inside the area of interest, e.g. 25.0 meter. The area of interest will be computed automatically based on the layout of the scenario, i.e. the lateral position of the extraction wells, cut-out areas and observation wells.
Buffer GridSize (m)	Enter the gridsize to be used inside the buffer defined by the Buffersize (m), e.g. 100.0 meter.
Buffersize (m)	Enter the size of the buffer in meters, e.g. 1500 meter.
Select (multiple) type of Simulation Results	Select one or more of the supplied result options. • Phreatic Heads – choose this option to compute Phreatic Heads (and piezometric heads as well). • Drawdown • Flowlines Well Systems Not yet implemented • Flowlines All Wells Not yet implemented
Time	Display of the Start and End dates (not editable). These are determined automatically by the entered extraction rates. The simulation duration is primarily determined by the sequence of extraction.
Time Discretisation	Choose out of the following: • Daily base – choose this option to simulate between the Start and End date on a daily base. A summary is given below: • Defined by wells – choose this option to simulate between the Start and End with stressperiod lengths that depend on the entered moment of extraction. A summary is given below:
Use Time of Observation wells	Select this option to include (extra) intermediate stressperiods to take the moment of observations into account. This ensures that any comparison between observations and computed heads are measured/computed at identical moments. Bear in mind that computational times are linearly related to the number of stressperiods.
Add Final Steady-state solution	Select this option to add a final stress-period that simulates a steady-state of the last entered model input (i.e. extraction rates). A summary is given below:
Start …	Click this button to start the simulation(s). You will be asked to confirm this. iMOD will add the appropriate information regarding extraction wells to the selected runfile(s) and start iMODFLOW as defined by the keyword MODFLOW in the active preference file. iMODFLOW will start in a separate commandtool window. Scenario Simulation Command window: After a successful simulation, both the Scenario Simulation Command window and the Compute Results window will be closed.
Help …	Click this button to start the Help functionality.
Cancel	Click this button to cancel and close the Compute Results window.

Note: A simulation will block any use of iMOD. A simulation can be terminated by pressing the (red in Windows Vista) closing window button on the upper-right corner of the Scenario Simulation Command window.

Unit of Well-Screen	Select one the following options to determine the treatment of well screens: Meter+MSL: enter the screen depths in meter+Mean-Sea-Level (MSL) Meter+SLevel: enter the screen depths in meter+Surface Level (SLevel). The surface level will be extracted from the {TOP1}.idf as defined in the initialization file (SCENTOOL.INI).
Rate Distri-bution	Select one of the following options to determine the distribution of extraction rates among all individual well screens. • Mean Values: Distribute the extraction rate evenly among all filter screens using the thickness of each screen in penetrating aquifers, e.g. q\({}_{1}\)=T\({}_{1}\)/(T\({}_{1}\)+T\({}_{2}\)+T\({}_{3}\))Q; • Transmissivity Weighed values:* Distribute the extraction rate weighed by their thickness of each screen penetrating aquifers times their corresponding permeability values \(K\), e.g. q\({}_{1}\)=T\({}_{1}\)K\({}_{1}\)/(T\({}_{1}\)K\({}_{1}\)+T\({}_{2}\)K\({}_{2}\)+T\({}_{3}\)K\({}_{3}\))*Q. In fact, the same algorithm is used as described in Section section 8.12.3 for the iMOD Batch function MKWELL_IPF. Also, no extraction takes place from aquifers with transmissivities T \(\times \) K \(\le 0.1\) m\(^2\)/day. It should be noticed that the discharge is divided among all locations.
	Extraction well (Q) and rate allocation to the different screens (q\({}_{1}\)+q\({}_{2}\)+q\({}_{3}\)):

Table	Each row in the tables represents a well location and corresponding well screen depths. It is allowed to edit the table directly (screen depths). It is recommended to change lateral positions (the coordinates) by means of the Move option, however.
	Open Click this button to open a plain text file that contains date and extraction rates. Example of a text file with well location and screen depth `label,z1,z2,zx,y ‘Well 1’,0.00,-2.50,145732.28,448621.03 ‘Well 2’,0.00,-2.50,145667.50,448673.47 ‘Well 3’,-5.00,-10.00,145608.89,448725.91 ‘Well 4’,-5.00,-10.00,145550.28,448778.34 ‘Well 5’,-15.00,-20.00,145491.69,448821.53`
	Save As Click this button to save a text file that contains date and extraction rates.
	Add Click this button to add a new extraction well by clicking your left mouse button at the location of the well. Each time you click the left mouse button a new well will be added. Click your right mouse button to stop.
	Move Click this button to move an existing well. Move your mouse cursor in the neighbourhood of a well and observe that the mouse cursor changes to and the corresponding row in the table changes to red. Hold your left mouse button down and move the well by moving the mouse cursor. Release the left mouse button to start moving another well. Click your right mouse button to stop.
	Delete Click this button to delete an existing well. Move your mouse cursor in the neighbourhood of a well and observe that the mouse cursor changes to and the corresponding row in the table changes to red. Click your left mouse button to delete the well. Click another well to delete it, or click your right mouse button to stop.