Groundwater modeling of large domains with analytic elements

The necessity to have the disposal of a groundwater model covering the entire country of the Netherlands, Rijkswaterstaat initiated the development of 'NAGROM', which stands for NAtional GROundwater Model. This thesis describes the basis of the modeling approach developed for NAGROM. After the first two introductory chapters, in the first main part rules are developed for the application of the analytic element technique as developed by Strack. In the second main part the interaction between a system of surface waters and the groundwater in the regional aquifer in the same area are described by a simple formula, of which the general applicability is shown. In the last main part an approach is presented to arrive a the point that the different models of NAGROM give comparable results.