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                         MLU for Windows

         to download the latest version anytime.

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         VERSION HISTORY of MLU for Windows


MLU 2.25.77  January 2020
* Only minor modifications; No bugs found. 


MLU 2.25.76  April 2019

* Negative skin factors are allowed, but only when the casing radius is zero.
* A number of small improvements in the Time Graph options.
* More flexibility in reading MLU files; Graph settings and options not required.


MLU 2.25.74  January 2018

* When Optimization results are computed (Optimize button is blue)
   results can be Exported as a TXT file. The number of decimal 
   digits of the Calculated drawdown values depend on the computation 
   accuracy: it may be set from 3 to 8 and is equal to 50% of the 
   Stehfest parameter.
* MLU can be run in the Command line with two parameters, e.g.:    
   "C:\Program Files\MLU\MLU.exe" D:\MLU\modelname.mlu  D:\mlu\resultname.txt
   In this way:
   - MLU is started
   - The model file "modelname.mlu" is opened in MLU
   - The optimize computation is executed. When no optimization parameters 
     are specified, only drawdowns will be computed
   - Results are saved in the file "resultname.txt". An existing file will 
     be overwritten
   - MLU is closed.
   Options:
   /b ("background") MLU just performs the calculation and outputs the file in 
      background mode without continuously flashing on the screen   
   /d ("database") Line spaces between each group of observation well results are
      suppressed
* The MLU software is codesigned. Code signing is the process of digitally signing 
   executables to confirm the software author and guarantee that the code has 
   not been altered or corrupted since it was signed. 
* The Startup process is improved.


MLU 2.25.73  May 2017

* Some texts above the columns of the Aquifer System table depend 
    on the row (yellow or orange) of the active (darker) cell. 
    For copying purposes a standard text appears when the active cell 
    is placed somewhere in one of the three left columns.
* Some bug fixes in the way that graph settings are saved to the files


MLU 2.25.71  June 2016

* The maximum number of aquifer layers is set to 80
* Shift + Click selects a rectangular area.
* Performance improvements and minor bug fixes.


MLU 2.25.63  November 2014

* Long path+file names of up to 260 characters are allowed.


MLU 2.25.60  May 2014

* Bug fixed in the computation of the delayed observation well response
   in case of multiple observation well screens.


MLU 2.25.59  March 2014

* The maximum number of pumping wells is set to 1000+.
* Bug fixed in FTH files
* Minor bug fixed in brightness of Raster Image maps.
* Minor bug fixed in drawing Well-face flux curves.


MLU 2.25.54  June 2013

* The maximum number of pumping periods for each pumping well is set
   to 100, and the maximum number of measured drawdowns for each 
   observation well is set to 1000.


MLU 2.25.51  February 2013

* Tables of observations and tables of pumping periods are expanded 
   automatically when pasted blocks appear to be too large to fit within 
   the available rows.
* New installer fixes installation problems for Windows Vista.
   However, Windows 95 and 98 are no longer supported.
* When an observation well is found within the screen radius of one of the 
   pumping wells, the three cells for the observation well skin and radii are 
   disabled, showing a green-greyish color and the text "n.a.". 
   This situation is now limited to cases where the observation well screen
   is in the same model layer as a pumping screen.


MLU 2.25.41 July 2012

* When the contents of a cell are inadvertently lost, the original value 
   or text can be restored with the Esc key.
* The Esc key can also be used to interrupt the optimization process or 
   the computation of time curves.
* The sum of squared residuals (SSE) is displayed for each iteration 
   during the optimization process. 
* When time unit is set to seconds before the optimization process
   is started, the resulting parameter values are expressed likewise. 


MLU 2.25.32 January 2012

* Text boxes can be added to the contour plot, inside or outside of 
  the plot area. You can resize the box when the cursor is near the 
   lower right corner and you can drag the box when the cursor is 
   near the top boundary of the box. Font, background (transparency) 
   and border can be set. Texts and settings are saved to the file.


MLU 2.25.22 September 2011

* All graph settings are saved to the files
* Calculation preferences can be saved to the computer.


MLU 2.25.17 June 2011

* The maximum number of observation wells is 100, while the
   maximum number observations per well is increased to 500
* The extension of image files and world files is case-insensitive.


MLU 2.25.14 January 2011

* When an observation well is found within the screen radius of one of the 
   pumping wells, the three cells for the observation well skin and radii are 
   disabled, showing a green-greyish color and the text "n.a.".


MLU 2.25: October 2010

* The length units in MLU can be meters (m) or feet (ft). 
  Changing length units causes MLU to physically convert the length 
   related values of all input data in a similar way as changing time units.
  The default setting can be changed for future sessions in the 
  Calculate | Preferences window.


MLU 2.21: August 2010

* Rectangular raster image maps can be imported and displayed as
   background in contour plots. This includes raster files of the types:
   bmp, png, tif (or tiff), jpg (or jpeg) and gif. Some types of tif-files are 
   not supported (only a grey rectangle is displayed).
  To georeference the image map an associated world file is required
   with the same file name and the extension .bpw, .pgw, .tfw, .jgw  or
   .gfw respectively.
  Further details can be found at http://en.wikipedia.org/wiki/World_file 
  To import a file use: Main menu Import/Import image files/Add 
* Several contiguous image maps can be displayed at the same time.
* Right clicking in the contour plot//Chart options.../Background allows
  adjustment of the brightness (tranparency).
* Use Main menu/View/Background images (Ctrl-B) to switch the 
   background images on and off.
* All information of loaded image files is saved with an MLU file, to 
  restore the images upon reloading of the project.


MLU 2.20: April 2010

* Left clicking in the contour plot opens a pop-up window for zooming and
   some Chart options
* Zooming options are: Zoom area, Previous view and Zoom out (-)
* Chart options handle drawing of: Boundary, Grid and a simple Legend
* By default 'Save' and 'Save as' try to save the file in the map where the 
   file was loaded or last saved, as indicated by the text on the blue bar.


MLU 2.15: February 2010

* The maximum number of pumping periods per well is set to 50.
* During the optimization process calculations can be interrupted 
   with the [Stop] button. An interruped optimization process can be 
   continued [Run] or stopped [Cancel].
* When MLU has found a solution the user has to either accept 
   or reject the results.
* The MLU button on the Windows taskbar shows the file name of 
   the current model.


MLU 2.07: December 2009

* The red Optimize button turns blue when optimization results 
   become available for the present model
* The "Previous graph" button temporarily brings back the previous 
   Time graph for a comparison with the present graph, to detect 
   slight differences
* The width and height (in pixels) of the Time graph and the 
   Contour plot window are displayed on the Status bar when the 
   size of the window is modified
* The size (in pixels) of the Time graph or Contour plot can be set
   by the user before a bitmap is copied to the clipboard.


MLU 2.00: September 2009

* Time graphs only display curves for observed and pumped wells 
   by default
* Table type selection of time graphs and colors for drawdowns 
   and well-face fluxes
* Use of cursor for point inspection of observed and calculated 
   drawdowns and well-face fluxes
* Fast resetting of all drawing options
* Improved grid generator for up to 2.000.000 m wide FEM models 
   of up to 30.000 nodes per layer 
* Context sensitive Help screens.


MLU 1.60: January 2009

* Only non-negative skin factors can be entered
* Maximum number of observation wells is set to 50, while the
   maximum number observations per well is increased to 100
* The Stehfest parameter may be choosen within the range 6 - 16
* Optimization parameters are saved in MLU files
* All computations are performed with double precision accuracy.
  

MLU 1.20: October 2008

  Pumping Wells:
* Maximum number of pumping wells is 300.
* User selection of pumping wells and/or pumping periods 
   to be included/excluded from the time graphs and contour plot 
   computations and the optimization process.

  Observation wells:
* Maximum number of observation well is 300.

  Export:
* Saving of the model input data (not the computed heads) as a 
  Finite Element Model in a FEM format, ready for reading by MicroFEM.
  The number of nodes is limited to 50 000 per layer.
  The number of aquifers is limited to 20; 


MLU 1.10: September 2008

  Aquifer System:
* Zero-thickness resistence layers in stratified aquifers are allowed. 
  In such cases the vertical resistance (c-value) is computed as: 
  (thickness upper layer + thickness lower layer)/(2 * Kv).

  Pumping Wells:
* Numbering of pumping periods per pumping well. 
* Checking of the order of entered starting times per pumping well.

  Observation wells:
* Numbering of measurements per observation well.
* User selection of observation wells and/or individual measurements 
  to be included/excluded from the optimization process

  Export:
* Saving of the heads (or fluxes) that are computed to draw all 
  time-curves in a FTH-file format.


MLU 1.00: April 2008: 

* First release of MLU for Windows