『Abstract
　Durable development requires full profit and knowledge of natural resources potentialities. Multi-criterion approaches that encompass geological, morphological, hydrological and Geographical Information System technologies are ones of exiting developments in environmental sciences. This work is a proposition of a numerical model based on a groundwater potentiality index (GPI) calculation, using data on rock fracturing, lithology, drainage, topography, rainfall and drilling water yield. It provides the ability to identify areas indicating favorable conditions for exploratory well positioning in semi-arid zones with non-permeable outcrops. It is therefore a helpful tool to assist water resources prospecting in deprived regions. The newly conceived approach has been applied in the southeastern boundary of the Bouregreg and coastal basins of Central Morocco, where Paleozoic fractured rocks outcrop. The suitability of the GPI method use was verified by comparing the GPI map values with water yields of thirteen pumping tests in a field checking area, which revealed promising results.

Keywords: Water research; Pumping yield; Fractured aquifer; Groundwater potentiality index (GPI); GIS; Morocco』

Introduction
Site presentation
Parameters of groundwater potentiality index
　The fracturing (F)
　The lithology (L)
　The surface drainage network (D)
　The topography (T)
　The rainfall (R)
Methodology
Dataset description
GPI expression
Mapping of GPI and field checking
　The fracturing state
　The lithology impact
　The drainage impact
　The topography impact
　The rainfall impact
　The map of groundwater potentiality index
Conclusion and discussion
Acknowledgment
References