WTI2017 failure mechanisms - piping kernel : technical design

This document contains the technical design for a so-called piping kernel, which forms eventually a part the WTI 2017 failure mechanism library. The kernel comprises different software components for predicting the occurrence of progressive internal sand erosion in an aquifer under levees and structures. This erosion occurs between the so-called entrance and exit point, after preceding occurrence of uplift of the cover layer (if existing), and provided the occurrence of heave of sand particles at the exit point.