An integrated method to study and plan aquifer recharge

In the Mediterranean region, climatic variations in conjunction to intensive agriculture deteriorates groundwater resources which are over-exploited to cover irrigation demands. A characteristic example is Messara Basin in the island of Crete, Greece. This work presents an integrated suitability assessment study for potential aquifer recharge that considers the availability of water resources, hydro-geological and geomorphological characteristics, climatic scenarios, soil properties and suitability, and socioeconomic analysis under the framework of a suitable aquifer recharge technique.

The most suitable technique for planning the aquifer recharge was selected according to the area characteristics. The spreading method was assessed as the most suitable technique based on the area characteristics that should typically have a source of excess water available nearby, be located in a relatively flat area with permeable soils and be underlined by an unconfined aquifer. A multi-criteria decision analysis method was applied to identify suitable sites for implementing aquifer recharge type spreading method. The methodology is based on a multicriteria matrix developed in accordance to a relative optimization (weighting) method in terms of hydrogeological and geomorphological criteria, and water availability (reservoir, river). Criteria combining a high relevance and high data availability, and providing unique information, selected to assess the suitability of aquifer recharge in Messara basin such as slope, land use, hydrogeology, rainfall, groundwater level, soil texture and distance to source water.

All the aforementioned factors were separately studied and analyzed and then were combined under the principles of the spreading method to provide by means of spatial maps the most appropriate locations in the study basin.

The outcome of this work is a simple framework methodology for selecting the most suitable recharge locations of the underlying aquifers and to demonstrate its socioeconomic and environmental advantages. The results of this work will assist local authorities to consider the applicability of aquifer recharge in the Messara valley while it consists a framework for efficient planning of similar applications in other Mediterranean regions.

 

Acknowledgments

This work was implemented in the framework of the research project Uncertainty-aware intervention design for Mediterranean aquifer recharge. The project: "Uncertainty-aware intervention design for Mediterranean aquifer recharge benefits from the support of the Prince Albert II foundation". http://www.fpa2.org

 

References

Special water secretariat of Greece, 2017. Integrated Management Plans of the Greek Watersheds, Ministry of Environment & Energy, Athens.

Varouchakis, E.A., 2016. Integrated Water Resources Analysis at Basin Scale: A Case Study in Greece. J. Irrig. Drain. E-ASCE 142(3), 05015012. DOI:10.1061/(ASCE)IR.1943-4774.0000966