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SLIQ2D is a 2D computer program which calculates whether in a submerged slope of slope in sand or silt contains silt such metastability points may occur or not, based on the slope geometry, the relative density and the material properties of the sand or silt. In case no metastable point are calculated, the occurrence of a liquefaction flow slide may be excluded. The first DOS-version of the program was developed by Grondmechanica Delft in 1994, commissioned by Rijkswaterstaat. In 2009 a Windows-version was released, in which it was possible to distinguish (horizontal) soil layers with different properties. That version was later version has been implemented in D-FlowSlide. The theoretical background of SLIQ2D can be found in for example in the Handboek Zettingsvloeiingen. Background information on the Windows version of the model and guidance and guidance with respect to determination the determination of the input parameters can parameters can be found in the User Manual of SLIQ2D.