Access via selection in the menu from File Export Streamlines

The streamline calculation is possible following a steady state or transient flow calculation for 2D horizontal models. The calculated streamlines can look different for a model, depending on which type of flow calculation (GEONEU, INSTAT or SITRA module) was used. On the one hand, this is due to the fact that the streamline calculation is numerically very sensitive (the smallest deviations in the calculated potential heads or velocities cause noticeable volume differences) and, on the other hand, due to the different finite element calculation in the GEONEU/INSTAT and SITRA modules (see chapter "Steady state flow" or "Transient flow" ). By dividing the elements into triangles, the discretisation in the GEONEU module provides an additional result at the element centre point compared to the linear or bilinear FE approach in the SITRA module.

The chapter "How To - Determining catchment areas" documents the theoretical principles of a streamline calculation.

Input parameters