Only available in German language.

Analysis of systems for the infiltration of precipitation run-off according to the DWA-A 138 standard (Deutsche Vereinigung für Wasserwirtschaft, Abfall und Abwasser e.V.; Planung, Bau und Betrieb von Anlagen zur Versickerung von Niederschlagswasser, April 2005).

The following systems can be analysed:

• Surface infiltration 
• Swale infiltration 
• Pipe infiltration 
• French drain infiltration 
• Shaft infiltration (type A and B) 
• Basin infiltration 
• Certain combinations of the above systems 

Capabilities:

• Analysis using rainfall intensity tables from the KOSTRA atlas („Koordinierte Starkniederschlags-Regionalisierungs-Auswertung“) 
• Import of the rainfall intensity data determined using the KOSTRA atlas via a file or via the Windows clipboard 
• Draft design also using Reinhold's rainfall series’ 
• The permeability of the chosen soil can be selected from an expandable database of common soils for certain infiltration systems  
• Combination of infiltration systems compliant with DWA-A 138, e.g.: 
  • Swale french drain infiltration,  
  • Paving with swale, 
  • Paving with pipe or french drain, 
  • Paving with french drain, etc.  
• Pipe drain with multiple pipes possible 
• Analysis of infiltration systems for any frequencies (recurrence intervals) 
• Calculation of draining times for given infiltration types 
• User-defined output sheet 
• Print or copy screen sections, e.g. for transfer to a word processor 
• Integrated Mini-CAD system for additional annotation of graphics

Current updates & changes

• 13.5 (30.09.2026)

  • Bug: KOSTRA rain data 'From Map': Map shows 'Access blocked' instead of OpenStreetMap tiles (Manual)

• 13.4 (13.08.2026)

  • Bug: Duration level D without decimal places
  • Bug: A_SR is displayed twice in MRE
  • Bug: "Edit Rain Table" is not resolved correctly
  • Bug: h_M used instead of h_R in trench dimensions... (Only MRE)
  • Bug: Horizon / sky is no longer displayed.
  • Bug: Always highlight the smallest Eta in blue in the rain table

• 13.3 (02.07.2026)

  • Bug: Program crash when using "Save As" -> "ESC"

• 13.2 (19.05.2026)

  • Bug: I/O error: File not found -> Update recent files
  • Bug: Correctly apply location change in the name and in the infiltration calculation.
  • Bug: Duration stage under rainfall donation data unit [m/(s*ha)] is in minutes!
  • Bug: Map bug in
  • Bug: Storage factor in the swale-trench element is not changed.
  • Bug: k_i <= r_Dn 1E7 is not included as a calculation result...

• 13.1 (27.04.2026)

  • Feature: Update WPViewPDF-DLL (wPDFViewMKIMG04.dll) from v4.3 to v5.x