English Abstract This publication discusses the computer program
development of the "Groundwater Model for the Netherlands (LGM)". The
publication is also intended to be a user's guide. It describes the various
steps to be taken and procedures to be observed throughout the modelling
process while applying LGM. LGM is a coupled system of so-called
AQ-computer program packages and the Geographic Information System (GIS).
The communication between the AQ-environment and the GIS-environment is
based on ASCII files. The AQ programs are based on the numerical technique
of finite elements (triangles and quadrilaterals). The saturated
multi-aquifer geohydrological system consists of a series of aquifers
separated by aquitards. Presently, the main output of simulations with LGM
are maps of groundwater heads in aquifer, flux between the upper boundary of
the geohydrological system and the top system, and fluxes across the
aquitards. LGM can be used to assess the effect of various stresses upon
the geohydrological system, for example due to changes in groundwater
abstraction. LGM proves to be an efficient and versatile tool to address
various types of geohydrological problems.
