WinSLAMM Development

For a complete list of program modifications see the WinSLAMMLog.txt file for details.

Current Version 9.4.0 (release date: 17 August 2009)

• Biofilters -  Added the option to route both the outflow particle size distribution and the outflow hydrograph from an outfall wet detention pond to an outfall biofilter for each event.
  - Added the biofilter control practice as an option for the Freeway land use.
  - Routed particle sizes through biofilter engineered soil instead of applying a constant percent reduction value for each engineered soil type.
  - Added the option to modify the biofilter control practice in a group of files at one time.
  - Corrected water balance calculation discrepancies that occurred when modeling biofilters with only engineered soil and/or rock layers and no drain tiles.
• Hydrodynamic Devices and Catchbasins - Added the Lamella Plate feature option to the hydrodynamic and catchbasin control practices. 
• Street Cleaning - changes the way the program calculates street cleaning when the user selects a street cleaning frequency (eg, one sweeping per month) while using the Winter Season option.  Previously, the program selected April 1st as the first cleaning date, regardless of when the winter season ended.  With this change, the program will use the end of winter season date as the date of the first cleaning.
• Minor corrections, changes and additional error checks.

Version 9.3.4 (release date: 1 August 2009)

• Street Cleaning - Modified the programs default street cleaning start date when a cleaning frequency is selected.

Version 9.3.3 (release date: 16 March 2009)

• Grass Swales - Added swale length calculation option to allow users to calculate the swale infiltration volume using the total swale length rather than the swale density times the area served by swales.  Adjusted grass swale form input to allow user to set length and average length values independently of swale density.
• Minor corrections, changes and additional error checks.

Version 9.3.2 (release date: 23 November 2008)

• Grass Swales - Corrected an interpolation calculation error for the grass swale infiltration rate between 0.005 and 0.02 inches per hour. If the slope is between 0.005 and 0.0125 ft/ft then the swales will perform better than in v 9.3.1. If the slope is between 0.0125 and 0.02 ft/ft, then the swales will not perform as well as in v 9.3.1. For sets of swales in a community, we found that the overall difference in performance is around 0.1% higher. The performance of a single swale system, of course, will depend upon the slope. If the swale slope is not within the range described above, then the swale performance will not change.
• Batch Processor - Corrected the grass swale average swale length calculation and fixed a swale file transformation error in the batch processor.

Version 9.3.1 (release date: 5 July 2008)

• Grass Swales - Added grass swale maximum velocity, depth and shear values for each event to the grass swale event detailed output file.
• Hydrodynamic Devices - Added hydrodynamic devices to Freeway land use Paved Lane and Shoulder Area source areas and corrected hydrodynamic device calculation problems when the device was defined without any inlet flow controls.
• Minor corrections, changes and additional error checks.

Version 9.3.0 (release date: 21 April 2008)

• Biofilters/Infiltration Devices - Added particulate filtering through the engineered soil.
• Wet Detention Ponds - Added a scour reduction function to calculate reduced settling in ponds less than three feet deep.
• Grass Swales - Added particulate filtering in grass drainage systems.Also added more flexibility by allowing users to model different swale systems based upon land use.
• Hydrodynamic Devices - This control practice is now available as a source area control in addition to the drainage system control.
• Minor corrections, changes and additional error checks.

Version 9.2.6 (release date: 1 August 2009)

• Street Cleaning - Modified the programs default street cleaning start date when a cleaning frequency is selected.

Version 9.2.5 (release date: 1 Sept 2007)

• Minor corrections and additional error checks.
• Biofilter Modifications - Correct Land Use biofilter problem that incorrectly calculated Fraction of Runoff from Selected Source Areas value. Also changed the way biofilter elevation increments were calculated to remove problems that occurred due to elevation interpolation.

Version 9.2.2 (release date: 22 May 2007)

• Minor corrections and additional error checks.
• Batch Data File Modifications - This feature, introduced in v 9.2.0, now also includes a site description text editor to allow you to change the site description text for a group of .dat files
• Outfall Treatment Train Order - The outfall treatment train has been modified to use the 'Other' control practice first, then wet detention ponds, followed by biofilters.

Version 9.2.1 (release date: 19 March 2007)

• Minor corrections to the porous pavement cost estimation subroutine.

Version 9.2.0 (release date: 4 March 2007)

• Streets - The program includes modified street dirt accumulation and street cleaning functions to reflect newer street dirt research.
• High Efficiency Street Cleaners - Two types of street cleaners are now available as part of the street cleaning control practice - Mechanical cleaners and Vacuum or Regenerative Air cleaners.
• Porous Pavement - We have added a routing and storage component to the porous pavement control practice and added a porous pavement cross section graphic to the data input form so that you can more easily visualize the various elements of a porous pavement system. We have also added a porous pavement infiltration degradation function and cleaning function to the program.
• Rain File Analysis Tool - The program now includes a rain file statistical analysis routine that will help you to analyze a long series of rainfalls to determine which rainfall represents the typical annual rainfall year.
• Control Over the Detailed Output Options - We have developed a description of the various detailed output option files that the model generates as well as a way to turn these output options on or off.
• Biofilter Performance Data - We have added a biofilter water balance statistical summary as part of the event-by-event summary. This summary includes the time the water surface is above the top layer of the biofilter and the time that any water remains in the biofilter at all, information that some regulatory agencies require when evaluating biofilters.
• Stone Weeper Outlet - We have added a stone weeper outlet option for wet detention ponds.
• Model Version Updates - The model will now automatically update a version 9.0 or later WinSLAMM data file (after the user enters standard update information) to the current version of the model. Older WinSLAMM data files (.DAT files) will, by default, receive a set of parameter files that come with the distribution disk. If you do not want this to occur, you must re-set the default values. To do so, in the Main Menu, go to Tools/Default Model Options and press the 'File Update Options' button. In the .DAT File Update Information window, enter the file names and other variables that you want the program to update older version files to, by default.
• Batch Data File Modifications - The program will now allow you to add or change selected model parameters in any number of files at one time. This will allow you to analyze a community's runoff volume or pollutant load much more efficiently.
• Rain Files - We have significantly expanded the number and length of the rain files for the program. There are now over 140 rain files, including many that cover over 40 years of rainfall events. The rain files are available from the web site.
• Miscellaneous minor upgrades, error checks, bug fixes, and interface changes.