Inventory of managed aquifer recharge sites in Europe: historical development, current situation and perspectives

Hydrogeology Journal, Mar 2017

Different types of managed aquifer recharge (MAR) schemes are widely distributed and applied on various scales and for various purposes in the European countries, but a systematic categorization and compilation of data has been missing up to now. The European MAR catalogue presented herein contains various key parameters collected from the available literature. The catalogue includes 224 currently active MAR sites found in 23 European countries. Large quantities of drinking water are produced by MAR sites in Hungary, Slovakia, the Netherlands, Germany, Finland, Poland, Switzerland and France. This inventory highlights that, for over a century, MAR has played an important role in the development of European water supply and contributes to drinking-water production substantially. This development has occurred autonomously, with “trial-and-error” within the full range of climatically and hydrogeologically diverse conditions of the European countries. For the future, MAR has the potential to facilitate optimal (re)use and storage of available water resources and to take advantage of the natural purification and low energy requirements during MAR operations. Particularly with respect to the re-use of wastewater treatment-plant effluent and stormwater, which is currently underdeveloped, the use of MAR can support the public acceptance of such water-resource efficient schemes. Particularly for the highly productive and urbanized coastal zones, where the pressure on freshwater supplies increases by growing water demand, salinization and increased agricultural needs for food production (such as along the Mediterranean and North Sea coasts), MAR is expected to be increasingly relied on in Europe.

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Inventory of managed aquifer recharge sites in Europe: historical development, current situation and perspectives

Inventory of managed aquifer recharge sites in Europe: historical development, current situation and perspectives C. Sprenger 0 1 2 3 4 5 N. Hartog 0 1 2 3 4 5 M. Hernández 0 1 2 3 4 5 E. Vilanova 0 1 2 3 4 5 G. Grützmacher 0 1 2 3 4 5 F. Scheibler 0 1 2 3 4 5 S. Hannappel 0 1 2 3 4 5 0 Cetaqua, Water Technology Center , Carretera d'Esplugues 75, Cornellà de Llobregat, 08940 Barcelona , Spain 1 KWR - Watercycle Research Institute , Groningenhaven 7, 3433 PE Nieuwegein , The Netherlands 2 Kompetenzzentrum Wasser Berlin GmbH , Cicerostr. 24, 10709 Berlin , Germany 3 HYDOR Consult GmbH , Am Borsigturm 40, 13507 Berlin , Germany 4 Berliner Wasserbetriebe , Neue Jüdenstraße 1, 10179 Berlin , Germany 5 Amphos21 Consulting SL, Passeig de Garcia Fària , 49, 08019 Barcelona , Spain Different types of managed aquifer recharge (MAR) schemes are widely distributed and applied on various scales and for various purposes in the European countries, but a systematic categorization and compilation of data has been missing up to now. The European MAR catalogue presented herein contains various key parameters collected from the available literature. The catalogue includes 224 currently active MAR sites found in 23 European countries. Large quantities of drinking water are produced by MAR sites in Hungary, Slovakia, the Netherlands, Germany, Finland, Poland, Switzerland and France. This inventory highlights that, for over a century, MAR has played an important role in the development of European water supply and contributes to drinking-water production substantially. This development has occurred autonomously, with Btrial-and-error^ within the full range of climatically and hydrogeologically diverse conditions of the European countries. For the future, MAR has the potential to facilitate optimal (re)use and storage of available water resources and to take advantage of the natural purification and low energy requirements during MAR operations. Particularly with respect to the re-use of wastewater treatment-plant effluent and stormwater, which is currently underdeveloped, the use of MAR can support the public acceptance of such water-resource efficient schemes. Particularly for the highly productive and urbanized coastal zones, where the pressure on freshwater supplies increases by growing water demand, salinization and increased agricultural needs for food production (such as along the Mediterranean and North Sea coasts), MAR is expected to be increasingly relied on in Europe. Artificial recharge; History of hydrogeology; Future; Europe - Managed aquifer recharge (MAR) describes the intentional recharge and storage of water into an aquifer for subsequent recovery or for environmental benefits. MAR can be used to store and treat water in an appropriate aquifer from a variety of source waters, including river water, treated effluent, stormwater, desalinated seawater, rainwater, and even groundwater from other aquifers. MAR is a cross-cutting technology applicable for the drinking water supply, for processing water for industry, for irrigation and for sustaining groundwater dependent ecosystems. MAR relies on naturally occurring processes in the subsurface such as mechanical filtering, sorption and biodegradation, and is often applied in combination with engineered treatment systems, as pre-treatment prior to recharge and post-treatment after recovery. The European MAR catalogue presented herein contains data from the literature about the MAR type, coordinates, year of first operation and closure, reason for closure, operational scale, aquifer properties (hydraulic conductivity, target aquifer thickness), horizontal aquifer passage, residence time during subsurface passage, recovery rate/share of bank filtrate, source water type and end-use. This catalogue is aimed at (1) outlining the historical origins, (2) describing the current situation and (3) giving perspectives of future developments of MAR in Europe. Materials and methods There is a large variety of different MAR types, which can be classified based on the recharge and storage technique into four major groups (Table 1).Enhanced infiltration techniques rely on gravitational infiltration and percolation, and include different surface-spreading methods (areal recharge), point/ line recharge and in-channel modifications. Surfacespreading methods are among the simplest and most widely applied MAR techniques. In such methods, the source water is spread over a permeable land surface to enhance the infiltration and percolation to the groundwater body. Most of the existing large-scale MAR sites in Europe make use of this technique, and typically utilise infiltration ponds to increase the groundwater availability. Soil aquifer treatment (SAT) describes the infiltration and percolation of reclaimed water (treated wastewater) through soil and aquifer passage. Due to the lower quality of source water, SAT systems are often operated in wet and dry cycles to allow for maintenance (e.g., mechanical removal of clogging layer) or to restore aerobic conditions in the infiltration zone. During point or line Table 1 Classification and overview of MAR types included in the catalogue recharge, source water is infiltrated either in elongated (e.g., shafts, drains) or punctual (e.g., abandoned dug wells, bore holes) recharge structures. In-channel modifications are structures or measures applicable to stream or channel beds. Riverbed scarification is a measure to enhance the riverbed recharge by mechanical removal of the impermeable top layer in the riverbed. Sand dams are constructed in non-perennial rivers where during periods of high flow, the suspended solids in the stream flow accumulate upstream of the dam over time. Runoff water can easily infiltrate these highly permeable deposits, creating a small-scale artificial aquifer upstream of the dam. Sand dams are often found in Sub-Saharan countries. Induced bank filtration (IBF) describes the infiltration of surface water induced by pumping from a nearby well. In opposite to bank filtration, which is occurring due to losing river conditions, induced bank filtration emphasizes the purposeful abstraction of surface water by wells. During bank filtration, water quality improvement (treatment) of the induced surface water is commonly observed. IBF sites often consist of several wells situated in a line parallel or perpendicular to the bank of the surface water body. Induced bank infiltration sites are typically installed near perennial streams and lakes that are in hydraulic contact with the adjacent aquifer. Well injection techniques are used where thick, lowpermeability strata overlie the target aquifer(s). Well injection methods include aquifer storage and recovery (ASR), aquifer storage transfer and recovery (ASTR) and aquifer storage (AS). ASR is defined as Bthe storage of water in a suitable aquifer through a well during times when water is available, and the recovery of water from the same well during times when it is needed^ (Pyne 2005), whereas ASTR includes an Recharge technique and main MAR type Induced bank filtration (IBF) aquifer passage between the injection and abstraction well. ASTR serves to bridge seasonal gaps in source water by storing water in times of excess and recovering it in times of demand. The stored water is flowing according to the local hydraulic gradient toward the point of abstraction. ASTR is more appropriate in dry climates with pronounced seasonal water availability, but is also found in moderate climatic zones, e.g., the Netherlands. The increased transport component for all injected water as compared to ASR, enhances the removal potential for, e.g., bacteriological parameters. Also, enhanced mixing with native groundwater will occur, which can be seen as a positive or negative aspect, depending on location-specific conditions. Water storage to bridge seasonal gaps in water supply is often the primary goal when applying this technique. Aquifer storage (AS) primarily aims at groundwater replenishment in the target aquifer, e.g., to counteract seawater intrusion. Subsurface dams, which are rarely used in Europe, do not lead to additional recharge but enhanced groundwater storage where required. This type is therefore classified as enhanced storage. Other techniques such as rooftop water harvesting (also called rainwater harvesting), is a method for collecting source water (in this case rain) in the capture zone. Rooftop water harvesting can be combined with injection or infiltration techniques as per local conditions and requirements, and therefore, is not considered as a MAR technique. substantial changes. Selected data from the European MAR catalogue are available on a web-based geographic information system (GIS) platform and incorporated into a global inventory of MAR sites developed by the International Groundwater Resources Assessment Centre (IGRAC 2016). Maps presented herein were created with the public domain software QGIS 2.8.3; the coordinate reference system is ETRS89, Lambert Azimuthal Equal Area. Quality assurance and plausibility control Several persons with various professional backgrounds contributed to data acquisition. Besides the risk of typing error during data entry, many other factors, e.g., false interpretation, translation errors, outdated information sources, will challenge the quality of the collected data. Thus, following the data acquisition period, various quality control measures were carried out to ensure a high level of data integrity. Identified outliers and conspicuous extreme values of the database’s numerical fields were double-checked using the respective references. Besides these relatively simple statistical tests on individual fields, logical checks were performed between related parameters in order to identify data gaps. Implausible or unlikely combinations of parameter values were also checked and corrected if necessary. Data availability, coverage and limitations Results and discussion The data presented herein were compiled mostly from scientific publications (i.e., peer-reviewed papers, textbooks, PhD theses) accounting for 42% of all literature sources. Web pages of MAR operators account for 25%, presentations (both talks and posters) for 14%, technical reports and documents for 10%, reports from governmental and non-governmental projects 4%, and personal communication with specialists and operators, and newspaper articles account for 5%. The European MAR catalogue does not claim to be a comprehensive database including all existing MAR sites in Europe (which is virtually impossible). The lack of data for some countries does not necessarily mean the lack of MAR sites, but can rather be attributed to the fact that language barriers restricted the literature research to languages spoken by members of the author team (i.e., English, Spanish, German, Polish, Dutch and French). The database contains 278 MAR sites, out of which 56 sites were shut down before 2013. In most cases, the reason for closure is not reported, but many of the closed sites were used as pilots for a limited period of time. At other sites, operation has been suspended temporarily or was shut down entirely due to economic, technical or political reasons. Data presented herein build on reports from the DEMEAU project (Hannappel et al. 2014), but have undergone Historical development of MAR in Europe Information on the year of first operation and the year of closure allows outlining the historical development of MAR in Europe. The modern history of what is called MAR today begins with two techniques which are most prominently represented in the MAR catalogue: (1) induced bank filtration and (2) surface-spreading methods (Fig. 1). The first reported MAR site in Europe was in Glasgow (UK) where in the year 1810 the Glasgow Waterworks Company constructed a perforated collector pipe parallel to the Clyde River (Ray et al. 2002) and abstracted bank filtrated water (BMI 1985; note this site is not shown in Fig. 1 because it seems to be historically isolated). This method was successful at the beginning and many other cities in the UK (e.g., Nottingham, Perth, Derby, Newark; Ray et al. 2002) adopted the idea; thus, the 1860s became the first heyday of Bnaturally filtered water^ in the UK (BMI 1985). However, many of these early sites experienced problems with decreasing well performance and had to be abandoned in later years (BMI 1985); nevertheless, the idea of Bnaturally filtered underground water^ was born and spread to continental Europe, where it was soon adopted by cities in the Netherlands, Belgium, Sweden, France, Austria and Germany. The Fig. 1 Outline of the historical development of MAR in Europe showing the number of MAR sites opened or closed per decade between the 1870s and 2000s scientific investigation of Bartificial underground water^ in Europe began with the water engineers Dupuy, Belgrand, Salbach, Thiem and Richert in the late 19th century (Richert 1900). The progressing industrialization in the 19th century and growing population in European cities presented the water suppliers with new challenges. The traditional water supply based on surface water was impaired by increasing contamination from the new industries and improper sanitation. At that time, based on the experiences in the UK, Thiem proposed the application of riverbank filtration to cope with degrading hygienic surface-water quality and increasing water demand; thus, the pioneers of MAR in Germany can be found at the industrialization hubs close to the Rhine River (e.g., Water Works Düsseldorf 1870), the Ruhr River (e.g., WW Essen 1875), the Elbe River (e.g., WW Saloppe 1875, WW Hosterwitz 1908) around Dresden, and in the Berlin area (e.g., WW Müggelsee, switched to groundwater in 1904–1909, WW Tegel 1901–1903). To increase the abstracted water quantity, many water works constructed infiltration ponds which were often situated on the land side of the abstraction well galleries. Similar to the development in Germany, riverbank filtration (RBF) and infiltration ponds found application in the Netherlands, Sweden and Switzerland—for example, in the Netherlands, the first known RBF-based water supply was reported to have started its operation in 1890 (Stuyfzand 1989). The first MAR site in Switzerland started its operation in Basel BLangen Erlen^ in 1912. Eastern European cities then followed and in Hungary the first RBF site was installed north of Budapest on a Danube island (Szentendre Island) in the 1920s (Homonnay 2002); to date, this MAR system is the main drinking water source for Budapest (Homonnay 2002). Additional RBF sites have been developed on other Danube islands (e.g., Csepel) and nowadays several RBF sites exist along the rivers of Raba, Drava, Ipoly, Sajo and Hernad (Homonnay 2002). In Romania the MAR history starts with the operation of the Iasi water supply system at the Moldova River in 1911 and the cities of Cluj Napoca followed in 1935 with conjunctive use of RBF and infiltration ponds and Bacau in 1961 (Rojanschi et al. 2002). In Finland the first water plant using groundwater replenishment by infiltration ponds started its operation in 1929 in Vaasa (Tapio et al. 2006). A few other plants were developed before and after World War II, but the systematic development of MAR in Finland started in the 1960s (Tapio et al. 2006). It is reported that in the year 1992 about 20 water suppliers relied on different MAR types mainly constructed in the 1970s and by 2002, already 25 operating water works utilized MAR in Finland (Tapio et al. 2006). Finally, Tapio et al. (2006) report that after several decades of experience with MAR, this technique is continuously favored by water suppliers. Research and development of well injection methods began in the 1960s. These early sites were mostly situated in the Netherlands where pilot-scale trials began. Stuyfzand et al. (2012) report that many of these early ASR sites have been closed due to clogging problems. An exception is located in Barcelona, Spain, where a dozen ASR wells were constructed in the early 1970s and are still active today (Hernández et al. 2011). Here, the high transmissivity of the target aquifer (up to 40,000 m2/day) and low turbidity (<1 NTU) of source water are key parameters associated with the good long-term system performance (Hernández et al. 2015). Cleaning cycles consist of pumping episodes of 15 days with a flow rate four times higher than the injection flow (Azcon and Dolz 1978). Maintenance strategies and clogging aspects are known to be important to consider for MAR practices, but were only rarely reported in the available literature for the European sites. However, in addition to turbidity, as illustrated by the example given, redox mixing and clay swelling are some of the additional factors to consider with respect to clogging risks, which may require pre-treatment prior to injection. In-channel modifications have been practiced since the 1960s in the Llobregat River in the Barcelona area by riverbed scarifications. Recently this technique experienced decreasing infiltration rates and it is planned to stop or to modify current practices in the near future. Currently this old technique is operated together with other complementary MAR techniques (ASR, infiltration ponds) in the Llobregat area of Spain (Hernández et al. 2015). Until today, the expression Bartificial recharge^ has often been used. In Europe, this term dates back to the early investigators such as Richert (1900) and describes Bunderground^ water recharged by human activities. Later on in the late 1990s and the beginning of the 21st century the term ‘managed aquifer recharge’ was introduced. Some authors reason that Bartificial recharge^ falsely implies that a somewhat artificial process occurs (Dillon 2005), which can be misleading because the purification in the subsurface relies on natural processes. Moreover, the term MAR refers to the management of aquifer recharge, which implies that risks are managed in a quantitative way. Current situation of MAR in Europe The catalogue includes 224 MAR sites active in the year 2013, found in 23 European countries (Fig. 2).Most of the active MAR sites are found in Germany (n = 64) followed by the Netherlands (n = 41), France (n = 21), Finland (n = 14), Sweden (n = 11), Switzerland (n = 10) and Spain (n = 10), while in the other countries less than 10 active MAR sites have been found. The most widespread MAR type is induced bank filtration with 127 sites (57% of total active sites); surface-spreading methods rank second among all MAR types with 77 sites (34% of total active sites). Well injection Fig. 2 Number of MAR sites and types for European countries (only MAR sites active in 2013 are shown) schemes form the third largest group of MAR types with 11 active sites (5% of total active sites) and 23 abandoned sites. Active-point or line-recharge and in-channel modification sites have been found 7 and 1 time(s), respectively. Enhanced storage MAR types, i.e., sub-surface dams, were not found in the literature for Europe. The spatial occurrences of MAR sites and aquifer properties are shown in Fig. 3; these were derived from the International Hydrogeological Map of Europe (‘IHME 1500’) as reported in BGR & UNESCO (2014). IHME 1500 is a generalized hydrogeological map series covering the European continent. Aquifer properties are displayed by their hydraulic productivity and dominant rock type. The overwhelming majority (n = 150) of MAR sites included in the catalogue are situated in unconsolidated geological formations. It is clearly visible that the most common types of MAR are induced bank filtration and surfacespreading methods, located in central and northern countries where large perennial rivers and lakes exist. As shown by IHME 1500, Sweden, Finland, Norway and some parts of Denmark are characterized by local and limited groundwater availability or even essentially no groundwater (Fig. 3). In the Nordic countries, hard rock formations are widespread, while hydraulically conductive formations occur as small unconsolidated glacial deposits (e.g., esker, sander). The occurrence of conductive but small aquifers on one hand and the availability of surface water on the other hand is a main driver for the implementation of MAR (IAEA 2013). In the Nordic countries, surface-spreading methods dominate over induced bank filtration, because surface-spreading methods allow for groundwater replenishment to increase groundwater availability. In the Nordic countries, a special kind of surface spreading has been developed in the last years. Some sprinkling infiltration plants (n = 3) have been established, e.g., on forested Fig. 3 Overview of MAR sites in Europe and simplified hydrogeological formations (Aquifer types reported in the International Hydrogeological Map of Europe,‘IHME 1500’, BGR & UNESCO 2014) eskers in Finland (Helmisaari et al. 2005; Lindroos et al. 2002). Sprinkling irrigation (a subtype surface-spreading method) is envisaged to sustain higher dissolved oxygen concentrations in the recharge water in order to avoid anoxic conditions and associated dissolution of geogenic redoxsensitive compounds during subsurface passage. Helmisaari et al. (2005) also highlight that sprinkling irrigation does not cause much disturbance of the environment because the recharge water is Bsprinkled directly onto the forest soil from a network of pipes and therefore does not cause as much direct disturbance to the vegetation and soil surface as, e.g., basin recharge^. On the other hand, more land is required for sprinkling irrigation as compared to basin recharge, because the recharge areas in the forests are operated in alternating wet/ dry cycles. Apart from different types of surface-spreading methods in the Nordic countries, the MAR catalogue depicts a number of IBF sites which are, in contrast to IBF sites, in central Europe, mostly situated at lakes rather than rivers. In central Europe—i.e., Belgium, the Netherlands, Germany, Poland, Czech Republic, Slovakia, Slovenia, France etc.—MAR sites are usually found in productive unconsolidated aquifers, e.g., in the North European plain in North Germany and large parts of Poland, and along the major rivers. Clusters of MAR sites can be seen in the Netherlands, in Germany along the rivers Rhine and Elbe, in Berlin, and along the Danube River in Austria, Slovakia and Hungary. Most of the IBF sites from the catalogue are found in central Europe. In the Mediterranean region—i.e., Spain, Italy and some parts of France—IBF sites are only marginally found, but some IBF sites are currently under development, e.g., in the Toscana region near Lucca, Italy (Rossetto et al. 2015). In the Mediterranean countries, mostly surface-spreading sites are found, but also in-channel modifications and point/line recharge schemes. Surface-spreading sites in this region are often designed without point of recovery and mainly aim to replenish the target aquifer, which is often used for agricultural purposes. At a site in Portugal (Campina de Faro aquifer system), river water was recharged through infiltration ponds in order to improve native groundwater quality (Ferreira et al. 2007). Source water type and end-use Potential source water types for MAR are river and lake water, stormwater, reclaimed water (treated effluent), desalinated water, and even groundwater from other aquifers or drinking water. The end-use describes the intended final usage of the water from the MAR scheme and includes agricultural, domestic (drinking water), environmental and industrial enduses. The number of MAR sites related to water end-use are shown in Fig. 4. Figure 4a shows that most MAR sites producing domestic water rely on surface water as their source water, whereas Fig. 4b shows which MAR type is producing for which enduse type. It lies in the nature of MAR that multiple end-uses may exist and a single end-use was sometimes difficult to define. Some sites, for example, do not recover the recharged water and the end-use is then attributed to the dominant usage of the target aquifer—e.g., if the aquifer is mainly used for drinking water abstraction, the end-use is then drinking water production. An environmental end-use is realized when the site is mainly for achieving environmental goals, e.g., sustaining groundwater dependent eco-systems or counteracting salinity ingress. River and lake water are the most frequent source water types utilized for domestic drinking water supply to a large extent (Fig. 4a). The most frequent MAR type is induced bank filtration and has obviously two primary water sources: river and lake water (Fig. 4b). However, groundwater, which is in many cases of bank filtration also a source, is not shown here, despite the fact that native groundwater may contribute significantly to the abstracted water. Reclaimed water as source water is found at two active MAR sites. One MAR site uses this source water type for agricultural purposes in Spain (Ayuso-Gabella et al. 2011), and the other site produces domestic drinking water with reclaimed water in Belgium (van Houtte et al. 2012). In Torreele/St-Andre (Belgium), treated wastewater is infiltrated in a dune area. The MAR system, in combination with advanced technical pre-treatment, produces potable water in the range of 2.5 × Fig. 4 a Source water types and b MAR types, in relation to enduses for MAR sites in the catalogue (only MAR sites active in 2013 are included) 106 m3/a (van Houtte and Verbauwhede 2008). Another ex ample for MAR using reclaimed water is found at the Llobregat aquifer in Barcelona (Spain), where reclaimed water was injected via injection wells to counteract seawater intrusion (Ortuno et al. 2012). This hydraulic barrier was in stand-by from 2011 (not shown in Fig. 4) due to financial constraints. The main reason for stopping the injection was the high costs of the (pre-)treatment of reclaimed water (a 15,000 m3/day plant of ultrafiltration and reverse osmosis was constructed to improve reclaimed water quality before injection). Apart from this clearly communicated usage of reclaimed water by MAR, several other MAR sites exist which use treated wastewater or a blend of fresh and treated effluent water as source water. This de-facto use of reclaimed water is often found at MAR sites situated downstream of a sewage treatment plant, e.g., bank filtration at Berlin-Tegel (Germany) or at the infiltration pond in Sant Vicenç dels Horts (Spain). MAR sites with a clear environmental end-use are rare and account only for 1% (n = 3) of all active sites. In Germany, at an open-pit lignite mine (Garzweiler near Cologne), different surface-spreading techniques (e.g., infiltration shafts, wells) are operated by the mining company to stabilize the water table in order to preserve natural wetlands and swamps (RWE Power 2006); the majority of the source water is groundwater from the active mining area and it is then transported through a pipe network (ca. 125 km lengths) to the adjacent recharge areas to sustain the groundwater dependent eco-systems. Not all potential source water types have been found to be utilized by European MAR sites. Stormwater run-off is not found as source water for MARs in Europe, and industrial end-use is found at three sites only (in Duisburg and Cologne in Germany, where IBF schemes are operated by industrial companies). Contribution of MAR to drinking water supply The volumetric contribution of MAR-derived water to the drinking water supply for European countries according to the operational scale of MAR sites is shown in Fig. 5. The operational scale gives insight into the total water quantity produced by the MAR scheme. Currently about 190 MAR sites in Europe produce drinking water (see Fig. 4) and are operated by water utilities (mostly public bodies). The percentage contribution of MAR-derived drinking water to drinking water supply is calculated with data from the European Environmental Agency for the year 2007 (EEA 2010). The contribution of MAR-derived water to drinking water production varies greatly from country to country. In some countries, e.g., Hungary or Slovakia, MAR water may contribute ≥ 50% to the drinking water supply, while other countries, e.g., France, yield only 3% of their drinking water supply from MAR. Countries with a share of MAR-derived drinking water < 1% (e.g., Belgium or United Kingdom) are not shown in Fig. 5. Some of the largest MAR sites exist on islands in the Danube River, upstream and downstream (IBF sites in Csepel and Szentendre) of Budapest in Hungary. The installed well capacity (indicating the operational scale) of these sites are reported to be 146 and 219 × 106 m3/a, respectively Fig. 5 Percentage contribution of MAR-derived drinking water (calculated from the MAR catalogue) to public water supply (taken from EEA 2010) for European countries. Countries with a MAR contribution <1% are not shown. NO Norway, SE Sweden, FI Finland, DK Denmark, NL The Netherlands, BE Belgium, DE Germany, PL Poland, CZ Czech Republic, SK Slovakia, AT Austria, SI Slovenia, HU Hungary, CH Switzerland, FR France, IT Italy, GB Great Britain (Grischek et al. 2002). Along with all other MAR sites in Hungary included in the catalogue, the total drinking water volume derived from MAR is about 327 × 106 m3/a, making up ∼50% of the public water (total public water supply 661 × 106 m3/a, EEA 2010). Laszlo and Literathy (2002) estimated the share of riverbank filtrated water to the drinking water supply to be around 40% (in total ∼470 × 106 m3/a), but the source of these figures remain unclear. Also the Slovakian public water supply relies on MAR to a large extent. The sum of operational scale for all Slovakian MAR sites (entirely IBF) makes up approx. 55% of total public water supply (175 × 106 m3/a from a total 319 × 106 m3/a). Especially in the Netherlands, different MAR types are used for drinking water production to a large extent. The sum of operational scale for all MAR sites producing drinking water in the Netherlands is about 295 × 106 m3/a, contributing about 24% to the public water supply (1,256 × 106 m3/a from E E A 2 0 1 0 ) . A c c o r d i n g t o t h e M A R c a t a l o g u e , The Netherlands water supply relies on induced bank filtration (7.7%), well injection (0.8%) and spreading methods (15%); Stuyfzand (1989) estimated that approx. 7% of drinking water was produced by IBF systems (valid for the year 1981), which is quite similar to calculations from the MAR catalogue. The catalogue includes 14 MAR sites from Finland with a total operational scale of 667 × 106 m3/a. Total annual public water supply in 2007 was 404 × 106 m3 (EEA 2010), which results in a contribution of 17% MAR water to public water supply. In the literature, estimations for the contribution of MAR water to the public water supply in Finland are in the range of 13–15% from IBF and surface-spreading sites in 2003 (Tapio et al. 2006). Helmisaari et al. (2005) estimated that MAR-derived water accounted for about 15% of the water distributed by Finnish water works in 2005 and is likely to increase to 20% by the year 2010. Figures from the MAR catalogue come to quite similar estimations with 3% from IBF and 13.5% from surface-spreading sites. For Germany, the catalogue includes 59 active MAR sites producing domestic water (42 sites with dominant induced bank filtration and 17 sites with dominant surface spreading). It should be noted that some water works, e.g., WW Flehe, WW Staad and WW Holthausen in Düsseldorf, are combined to a single site; hence, the real count of MAR sites is likely higher. However, the sum of operational scale from MAR sites in Germany producing drinking water makes up 746 × 106 m / 3 a, which is about 14% of the total public water supply—public water supply 5,371 × 106 m3/a from EEA (2010). Schmidt et al. (2003) estimated that 16% of drinking water in Germany is produced by IBF and surface-spreading sites. Other calculations are found in StatBund (2013)—IBF water makes up 7.8% and surface-spreading sites 9.2%, with a total contribution of 862 × 106 m3/a; both of these published figures are slightly higher compared to calculations from the MAR catalogue, and may indicate some missing German MAR sites or underestimated operational scale. On the other hand, the operational scale for MAR sites is often based on estimations rather than exact measurements, and is therefore subject to variations. However, by looking on the city scale, e.g., in Berlin, the MAR catalogue includes eight active MAR sites producing about 135 × 106 m3/a of water, contributing 67% to the total water supply—water supply in Berlin is 202 × 106 m3/a in 2006 taken from Möller and Burgschweiger (2008). This proportion of MAR water for Berlin water supply is comparable to estimations from Schulze (1997), Hiscock and Grischek (2002) and Massmann et al. (2008b), given as 70–75%. The MAR catalogue includes eight sites producing domestic water in France. The sum of operational scale from these sites makes up approx. 3% of the public water supply in France—total public water supply 5,861 × 106 m3/a from EEA (2010). Other figures in the literature, such as 50% of bank filtered water in France (Doussan et al. (1997) and references therein), seem to exaggerate the share of MAR water for public water supply. This large contrast may be explained by different definitions of bank filtration among the countries. In France, production wells which are situated in alluvial strata were considered as surface water influenced and therefore categorized as riverbank filtration wells. This rough simplification may have led to the high share of RBF water, but the actual figures are likely lower. The MAR catalogue lists nine sites in Switzerland producing domestic water with a total operational scale of approx. 100 × 106 m3/a. Public water supply in 2007 was 981 × 106 m3/a (EEA 2010) yielding 10% contribution of MAR water. Diem et al. (2013) estimated that about 25–30% of drinking water originates from induced bank filtration alone in Switzerland. This catalogue entry comes to much lower proportions for all MAR schemes together and it remains unclear how this large difference may be explained. Aquifer properties and operational parameters Aquifer properties such as hydraulic conductivity and thickness of the target aquifer are highly important for MAR. Apart from this hydraulic data, the catalogue classifies target aquifers in consolidated and unconsolidated aquifers and aquifer confinement (confined, semi-confined, and unconfined). The target aquifers can further be differentiated by their specific aquifer properties describing the geological genesis of the aquifer (e.g., glacial, fluvial deposits) and the predominant pore type (unconsolidated, fractured, and karstified). Operational parameters are those parameters which can be, at least within the hydrogeological boundaries, controlled by the operator. Operational parameters include the lengths of the horizontal aquifer passage and achieved recovery rates. The horizontal aquifer passage is the modal distance between the point of recharge (e.g., river banks during induced bank filtration or the injection well during ASTR) and the point of recovery (the abstraction well). The recovery rate describes the volumetric ratio between the recharged and the recovered water. Representative properties, expressed as the 10th and 90th percentile, of target aquifer properties for surface spreading, induced bank filtration and well injection are shown in Table 2. As shown already in Fig. 3, the overwhelming majority of MAR sites are situated in unconsolidated geological strata. MAR sites situated in consolidated geological media are found near London (UK) close to the Thames River where a fissured chalk aquifer (limestone) is hydraulically connected to the overlying riverbed deposits and used for IBF (Schijven et al. 2002). Other examples of MAR in consolidated media can be found in the Salento region in Italy (Ayuso-Gabella et al. 2011), some sites in Spain (Diaz Murillo et al. 2002) or the large ASTR scheme in north London (Harris et al. 2005). Evidence of MAR systems in karstified aquifers has not been found in the literature. Based on the data included in the catalogue, it was observed that MAR in consolidated aquifers is the exception in Europe. It can be concluded that the complex flow conditions and higher degree of heterogeneities (e.g., flow conduits, secondary porosity) require additional field investigations—an example of a tracer test at an ASR site in fissured chalk aquifer is given by Williams (2000). Moreover, Representative properties of target aquifers and operational parameters for induced bank filtration, surface spreading and well injection (Hydro)geological propertiesa the limited purification capacity in consolidated aquifers compared to unconsolidated aquifers complicates the realization of MAR systems. Flow conduits may act as preferential flow paths which transport water with elevated flow velocities, thereby decreasing the residence time of infiltrated water in the subsurface. Residence time is known to be a crucial factor for many attenuation processes during MAR, e.g., microbial transport (Schijven et al. 2002) or pharmaceutical residues (Massmann et al. 2008a); hence, the overwhelming majority of MAR sites are situated in unconsolidated aquifers. Geological formations such as fluviatile and glacial sediments as well as aeolian deposits (e.g., in the Netherlands, Belgium) are commonly utilized. MAR sites situated in consolidated geological media are very rare and no MAR site in karstified strata was found. Out of 127 IBF sites, 60 have been reported to be under unconfined conditions and 9 under semi-confined conditions, and out of 77 surface-spreading sites, 29 have been found to be under unconfined conditions and 4 semiconfined (for the remaining no information was found). Both MAR types require unconfined conditions and it must be assumed that sites where this specific information was not found are also under unconfined conditions. Well injection sites were often reported to be under confined conditions—for example, the ASR site in Barcelona-Cornellà is located between the phreatic aquifer (upstream) and the confined aquifer (downstream). Induced bank filtration and surface-spreading techniques show a similar range of hydraulic conductivities. Well injection techniques indicate hydraulic conductivities approximately one order of magnitude lower, but the number of records is relatively low. Target aquifer thicknesses are also similar between IBF and surface-spreading sites. This finding is not surprising as many IBF and surface-spreading sites were developed conjunctively and are situated in the same aquifers. 40–96 (n = 4) NA NA NA The horizontal aquifer passage roughly relates to the residence time of the infiltrated source water in the subsurface, but is not equal to the flow path. The horizontal aquifer passage may also give insight on the share of source water abstracted by the recovery well(s). As a rule of thumb, a short horizontal aquifer passage within a thin aquifer implies short residence times and high shares of source water in the abstraction well. However, both parameters also depend on aquifer properties, well design and operational parameter for a particular site, which makes it challenging to assess residence times or share of source water based on horizontal aquifer passage alone. The data from the MAR catalogue show that IBF sites have a wide range of horizontal aquifer passages, from a few tens of meters—e.g., 20 m at the Eura IBF site in Finland (Kivimäki 2001)—to even a few kilometers such as the 3.5 km at Aalst IBF site in the Netherlands (Stuyfzand and Doomen 2004). Exceptionally long horizontal aquifer passages are found in the Netherlands where well fields, consisting of some 15–20 wells, are situated in a row perpendicular to the river bank. The horizontal distances reported by Stuyfzand et al. (2006a, 2006b) were measured between the central part of the well field and the riverbank during low flow conditions in summer. At other IBF sites, the well fields are situated in a row parallel to the river or lake bank—e.g., IBF in Berlin as described in Massmann et al. (2004). IBF sites with short aquifer passage are usually characterised by high shares of bank filtrate—e.g., Remmerden in the Netherlands with 82% (Stuyfzand and Doomen 2004). However, also IBF sites with long horizontal aquifer passages (≥3000 m, e.g., Aalst, Kolff and Druten) may abstract substantial shares of bank filtrate (29–68%) in their recovery well(s) (Stuyfzand et al. (2006a, 2006b). Analogous to IBF, the surface-spreading sites also show a wide range of horizontal aquifer passages, from 30 m at an infiltration pond in Poland (Blazejewski 1983) to 1,450 m at a sprinkler irrigation site in Finland (Lindroos et al. 2002). Only a little information about the horizontal aquifer passage and achieved recovery rates for well injection schemes was found and therefore not included in Table 2. The residence time during MAR is a critical parameter to ensure sufficient attenuation of hygiene-related parameters and other undesired substances. From a hygiene perspective, a subsurface travel time of around 50–60 days (in the UK 400 days are defined as the outer source protection zone) are often demanded by European directives (Chave et al. 2006; DVGW 2006). Representative values from the MAR catalogue shows that residence time for some IBF sites can be substantially shorter than 50– 60 days. It has to be taken into account that travel-time estimations are subject to large variations depending on the assessment method applied. Travel time estimations based on only hydraulic data must be considered less accurate than estimations based on tracer breakthrough curves. However, median values for IBF and surfacespreading sites were calculated to be 70 and 55 days, respectively. Recovery rates for surface-spreading sites were often not reported in the literature and found only at four sites. Whenever possible, this value was calculated based on information from the literature source, e.g., at the Solleveld site (infiltration ponds in dune areas in the Netherlands), the average annual abstracted water volume is lower than the average annual infiltrated volume and the overall recovery rate was approximated to be 90%. For IBF systems, the share of bank filtrate describes the volumetric ratio between bank filtrate and native groundwater in the recovery well(s). Information about the share of bank filtrate was found at 36 IBF sites and ranges from minimum 10% to maximum 100%, resulting in representative values of 21–100% (10th and 90th percentile, respectively). Perspective of MAR in Europe and conclusions For over a century, various forms of managed aquifer recharge have been used in Europe. This development has occurred autonomously, with Btrial-and-error^ within the full range of climatically and hydrogeologically diverse conditions of the European countries. Although, over the years, the use of MAR has grown and spread independently throughout Europe in support of the EU strategy for resource and energy efficient water production and management (EEA 2014), the benefits of MAR could develop towards it becoming a Bfirst-option^ in securing water availability for the future. In the face of numerous stresses on the availability of water such as climate change, increased weather variability, salinization, as well as increased urbanization of coastal zones and emerging substances, MAR has the potential to facilitate optimal (re)use and storage of available water resources and to take advantage of the natural purification and low energy requirements during MAR operations. Particularly with respect to the re-use of wastewater treatment-plant effluent and stormwater, which is currently underdeveloped, the use of MAR can support the public acceptance of such water-resource efficient schemes. In developing water availability strategies in the face of numerous challenges, Europe is not alone; worldwide, MAR is being considered as an integral and essential technique to meet objectives and demands for the future—e.g., Sheng and Zhao (2014); Megdal et al. (2014); Dillon et al. (2010). As globally, the pressure on freshwater supplies increases by growing water demand, intensified by continued urbanization, increased agricultural needs for food production and the desire to preserve ecosystem integrity, MAR is expected to be increasingly relied on. The most densely populated and (economically) productive regions of the world are in the coastal zones, particularly in Europe along the Mediterranean Sea and the North Sea. It was estimated that about half of the world’s population lives within 200 km of a coastline (UN 2010). While these areas produce many economic benefits, the associated high water demand puts tremendous pressure on freshwater resources and coastal ecosystems, leading to problems like seasonal water shortage, overexploitation of groundwater resources, saltwater intrusion, and disappearance of wetlands. Further economic growth, population increase, and climate change will aggravate these problems, ultimately blocking the sustainable development of coastal zones in industrialized, emerging, and developing countries (EC 2012); therefore, in 2015, water crises were identified as the main global risk (WEF 2015). Traditionally, aboveground solutions such as construction of reservoirs or saltwater desalination are often sought to solve freshwater problems. However, the subsurface may provide more robust, effective, sustainable, and cost-efficient freshwater management solutions—for instance, artificial recharge of aquifers with temporary freshwater surpluses is increasingly applied worldwide for water storage and treatment (Dillon et al. 2010). Typically, artificial recharge in unconfined aquifers is used to increase volumetric water availability by filling part of the overlying unsaturated zone. In (semi)confined aquifers, however, artificial recharge can also increase water availability by displacing native groundwater that is not suitable or less suitable for use than the water source available for storage. In fact, ASR and ASTR have been in confined/semiconfined aquifers, in Europe and beyond. Depending on the intended use, a wide range of water quality parameters—e.g., the presence of manganese, Antoniou et al. (2014)—can make native groundwater less suitable; however, in recent years, particular attention has been on the artificial recharge of freshwater in water-stressed areas with brackish or saline native groundwater (Ward et al. 2007, 2009). These studies have highlighted the impact of the density difference between the injected fresh and native saline water on recovery efficiencies, and recent advances using either horizontal or multiple partially penetrating wells enable the improved recovery in both confined and unconfined saline aquifers (Zuurbier et al. 2014a, b, 2016). During data compilation for the MAR catalogue, it was realized that clear economic case studies of European MAR sites are often not available. Economic feasibility can be evaluated using cost-benefit analysis, but site specifics and multiple benefits of MAR are often challenging to monetize. The lack of data for economic feasibility of the various types of MAR due to the wide range of benefits is considered to be a major barrier for implementation; however, recent nonEuropean studies about MAR economics related to water reuse (Vanderzalm et al. 2015), and conceptual frameworks for MAR economics including methods for monetizing typical MAR benefits (Maliva 2014), are readily applicable to European sites. Aquifer storage and recovery (ASR) for instance can be a successful technique for storage and recovery of both potable and irrigation water (Maliva and Missimer 2010); however, as in other areas in the world, it has not reached its full potential in Europe. The advantages of ASR consist of the limited space requirement above ground, the lack of losses by evaporation, the protection from atmospheric, biologic and anthropogenic contamination, and the protection from earthquake damage— for example, in the Netherlands, this increased ASR reliability is very much welcomed with the prospects of longer periods of drought, despite an increase in yearly gross precipitation (KNMI 2014) induced by climate change, while water is increasingly recognized as a scarce resource (WEF 2015). The need for water harvesting and storage is therefore expected to increase; furthermore, an increase in extreme rainfall events is expected in the Netherlands (KNMI 2014; Royal Netherlands Meteorological Institute 2014), which will require better exploitation of aboveground water reservoirs for retention of intense rainfall. ASR provides the means to lower the levels of these reservoirs by early infiltration once potential extreme rainfall events are predicted, and to provide retention, without having to discharge (and loose) the water to the sea. Therefore, the water remains available for later times of demand, while the unrecoverable part can counteract the ongoing salinization. Another European example from the coastal zone is Spain (e.g., the Llobregat aquifer in Barcelona) where MAR is considered as a promising technique to be implemented at a large scale using reclaimed water to improve groundwater availability without compromising surface-water availability for direct users. Acknowledgements This study has received funding from the 7th Framework Programme of the European Union under the grant agreement number 308339 within the DEMEAU project. 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C. Sprenger, N. Hartog, M. Hernández, E. Vilanova, G. Grützmacher, F. Scheibler, S. Hannappel. Inventory of managed aquifer recharge sites in Europe: historical development, current situation and perspectives, Hydrogeology Journal, 2017, 1-14, DOI: 10.1007/s10040-017-1554-8