User guide to SUB-CR : a MODFLOW package for land subsidence and aquifer system compaction that includes creep

This document is the user guide of SUB-CR, version 1.0. SUB-CR is a MODFLOW-2005 based land subsidence package developed by Deltares1 that includes consolidation by creep. The package was developed to allow the modelling of land subsidence with a more comprehensive and more complete process representation of soft-sediment deformation than existing regional-scale hydrogeological models of land subsidence which do not consider creep. Creep and secondary consolidation are important in geotechnical applications involving soft-sediment (silt, clay, peat) consolidation. There is no obvious reason why creep would be irrelevant or insignificant when these sediments consolidate and cause land subsidence driven by groundwater use and groundwater management.