The Dogger aquifer of Poitiers (France): groundwater quality and vulnerability

 

 

Amani SHORIEH, Mickael SAVARY and Moumtaz RAZACK*

Department of Hydrogeology UMR 7285

5 Rue Albert Turpain Bât.B8

86022 Poitiers Cedex – France

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Abstract.  This work focuses on the study of the Dogger aquifer in Poitou (France). This aquifer represents the main water resource for this region. Its resources are primarily used for drinking water supply in urban areas and for irrigation.

The objectives of the study are to analyze the flow pattern of the groundwater (flow conditions, relationships with major rivers Clain and Vienne), the mineralization processes  and its vulnerability to surface pollution.

 

    Key-Words. Dogger aquifer, Poitou region, Hydrochemistry, Vulnerability.

 

I.             INTRODUCTION

The Department of Vienne (Poitou-Charentes), located in west-center France (Fig.1) is supplied with water primarily from groundwater. The capital of the Department is the historical city of Poitiers. Total water volumes collected in 2010 amounted to 81 million m3, and are mainly used for drinking water and agriculture (Table 1). 66 million m3 are taken from groundwater, which is more than 80% of the total volume. Agriculture is the dominant economic activity in the region and uses 48 million m3, which represents 60% of the total volume. Groundwater accounts for 81% of this volume. These statistics place great emphasis on the vital importance of groundwater for this region.

This work focuses on the study of the Dogger aquifer, located between the rivers Clain and Vienne. The surface of the study area is about 500 km2. Piezometric campaigns and collection of groundwater samples were carried out during November 2012 to analyze the hydrodynamics (flow conditions, relationships with major rivers Clain and Vienne) and the mineralization processes of groundwater.

A preliminary analysis of this aquifer vulnerability to surface pollution was also undertaken, using the Drastic approach.

 

 

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