2.6.2.4.1 Lateral

2.6.2.4.1.1 Analytic element model

Analytic element modelling is grid independent and by default assumes aquifers are of infinite extent. The geological Gloucester Basin boundaries were therefore explicitly implemented as no-flow boundaries (Section 2.6.2.3.5).

2.6.2.4.1.2 Alluvial MODFLOW models

The Gloucester subregion is a closed geological basin. The alluvial aquifer is a relatively thin skin on a much thicker geological sequence. The saturated thickness of the lateral boundaries is very small compared to the thickness of the aquifer, and thus there are zero-flow boundaries along all edges.