This project report summarizes work conducted in work package 12 of the DEMEAU project. Along with Deliverable 12.1 it covers all tasks from work package 12 as formulated in the Description of Work (DoW). This report contains information about (pre-) feasibility studies, design recommendations and pre-treatment options for different types of MAR. The wide range of hydrogeological features encountered in reality makes a site-by-site approach indispensable. As part of this effort the hydrogeological pre-requisites for surface spreading and deep well injection techniques are described in detail. In chapter 2, ten essential hydrogeological parameters are defined by objective criterias. The following chapter outlines and describes how to obtain these essential hydrogeological parameters. This feasibility assessment starts with the screening of the potential site based on a structured procedure. Site investigations start with relatively cheap but numerous field and laboratory testing and continue to more cost-demanding but less numerous tests. With this procedure it is possible to carry out technical site feasibility in a costand time efficient way. The fourth chapter investigates the International Hydrogeological Map of Europe (IHME 1500) as a planning basis for pre-feasibility of new MAR sites. It was found that the IHME 1500 is useful for a pre-assessment, but detailed regional and local scale maps (and investigations) are additionally necessary to effectively assess hydrogeological features. The final chapter deals with pre-treatment options for MAR. Pre-treatment is necessary to remove critical contaminants from the source water to i) enhance system performance and removal efficiencies, ii) ensure the long-term functioning of the system, iii) meet regulatory demands and iv) ensure beneficial uses of the aquifer beyond the attenuation zone. Available pre-treatment methods in relation to source water type and intended end-use are described. Based on chemical concentrations in source water and intended end-use the most appropriate pre-treatment method can be assessed from a table. Altogether this report thus provides guidance in designing new MAR systems based on a sound hydrogeological site characterisation and pre-feasibility assessment based on available information and parameters obtained from structured investigations.

Different types of managed aquifer recharge (MAR) schemes are widely distributed and applied on various scales in the European countries, but no systematic categorization and compilation existed up to now. The European MAR catalogue presented herein includes a wide range of parameters, e.g. operational information, hydrogeological properties and water quality monitoring for different types of MAR. The database includes currently 270 MAR sites, but is neither a representative nor an exhaustive data compilation. Nevertheless, based on the available data it is shown that MAR plays an important role in the European water supply producing large water quantities for the domestic water supply.