Hydrogeology — SAQ

The BD LISA (Aquifer System Limits Database) repository currently in circulation is version 3.

This repository shall include the following spatial datasets:
— Level 3 hydrogeological entities (local);
— Elementary polygons delimiting each single stack of hydrogeological entities;
— Karst zones, areas characterised as karst-based or feeding karst sources;
— Movable alterite zones, polygons of extension of areas in which the presence of altered movable geological formations (saprolite) has been identified or is assumed.

As well as additional information tables:
— The multi-scale table comprising all hydrogeological entities mapped (levels 1, 2 and 3)
— The genealogy table summarising the changes made between version 2 and version 3 of BDLISA.
— The table of batteries of hydrogeological entities which associates each elemental polygon with the level 3 hydrogeological entities present under this polygon, ordering them vertically.
— The lithology table that associates each hydrogeological entity with the rock nature(s) that characterise it.