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Final Report Interreg Estonia-Latvia project No. Est-Lat62 “Joint management of groundwater dependent ecosystems in transboundary Gauja-Koiva river basin (GroundEco)” FINAL REPORT 2020 GroundEco “Joint management of groundwater dependent ecosystems in transboundary Gauja -Koiva river basin” Table of Contents ABBREVIATIONS 4 INTRODUCTION 5 1. Description of GroundEco project 6 2. Background for identification and assessment of groundwater dependent terrestrial ecosystems (GDTEs) according to the Water Framework Directive (WFD) 8 2.1. Role of groundwater dependent terrestrial ecosystems in the Water Framework Directive 8 2.2. How to determine whether a terrestrial ecosystem directly depends on groundwater body 8 2.3. How to determine whether there is a significant damage to groundwater dependent terrestrial ecosystem 9 2.3.1. Threshold values and trigger values 9 2.3.2. GDTEs that depend on concentrations of naturally occurring substances above threshold values 10 2.4. How to determine the groundwater quantity and quality needs of groundwater dependent terrestrial ecosystems 10 2.5. Characterization and risk assessment 10 2.5.1. Stepwise approach 11 2.5.2. Consideration of groundwater threshold values 12 2.5.3. Investigations 12 3. Methodologies used for assessment of groundwater dependent terrestrial ecosystems in the European Union 13 3.1. Results from joint questionnaires 13 3.2. Methodology for identification and assessment of groundwater dependent terrestrial ecosystems in Estonia 14 3.2.1. Identification of terrestrial ecosystems depending on groundwater bodies 15 3.2.2. Indicators and criteria for the evaluation of quantitative and qualitative effects of groundwater bodies (GWBs) on groundwater dependent terrestrial ecosystems (GDTEs) 16 3.2.3. Evaluation schemes of quantitative and qualitative effects of groundwater bodies on groundwater dependent terrestrial ecosystems 18 3.2.4. Application of the evaluation schemes and conceptual models of groundwater dependent terrestrial ecosystems 21 3.2.5. Monitoring scheme for groundwater dependent terrestrial ecosystems 21 3.2.6. Conclusions 23 3.3. Delineation of threshold values for groundwater dependent terrestrial ecosystems in United Kingdom 23 3.3.1. Nutrients as a risk for GDTEs damage 24 3.3.2. Nutrient related wetland categories 24 3.3.3. Factors affecting the relationship between nutrient and wetland conditions 25 3.3.4. Development of threshold values for groundwater dependent terrestrial ecosystems 25 4. Development of joint methodology for identification and assessment of groundwater dependent terrestrial ecosystems in Gauja-Koiva river basin 27 4.1. Groundwater monitoring in Estonia and Latvia 27 4.1.1. Groundwater monitoring in Estonia 27 4.1.2. Groundwater monitoring in Latvia 30 4.1.3. Comparison of groundwater chemical monitoring in Estonia and Latvia 31 4.2. Groundwater assessment in Estonia and Latvia 32 4.2.1. Groundwater body delineation approaches in Estonia 33 4.2.2. Groundwater body delineation approaches in Latvia 37 4.3. Habitat assessment in Estonia and Latvia 39 4.3.1. Availability and quality of habitat data in Estonia 39 2 GroundEco “Joint management of groundwater dependent ecosystems in transboundary Gauja -Koiva river basin” 4.3.2. Availability and quality of habitat data in Latvia 41 4.4. Joint methodology 43 4.4.1. GDTE identification methodology for Estonia and Latvia 43 4.4.2. Results of the identification of significant GDTEs in Estonia and Latvia in Gauja-Koiva basin 48 4.4.3. Assessment schemes of groundwater dependent terrestrial ecosystems 51 4.4.4. Monitoring of GDTEs in Estonia and Latvia 57 5. Methodology validation and testing of best tools and parameters 61 5.1. Matsi spring fen pilot site in Estonia 61 5.1.1. Study site description 61 5.1.2. Methods 62 5.1.3. Results and discussion 65 5.2. Kazu leja valley pilot site in Latvia 79 5.2.1. Introduction 79 5.2.2. Identification of ecosystems and impacts using vegetation as a proxy 85 5.2.3. Geology and hydrogeology 94 5.2.4. Conclusions 115 5.2.5. Assessment of Kazu leja GDTE according to the schemes of quantitative and qualitative effect 116 5.2.6. 3D geological model of the Kazu leja site 119 5.3. Development of low-cost do it yourself sensors 123 5.3.1. Introduction 123 5.3.2. Low-cost sensor setup 123 5.3.3. Results of the low-cost sensor units 125 6. Conclusions and recommendations 129 6.1. GDTE identification, monitoring and assessment 129 6.2. Recommendations for GDTE assessment according to the quantitative and qualitative assessment schemes application 131 6.3. Future prospects 133 REFERENCES 134 ANNEXES 141 Characteristics of groundwater bodies delineated in Latvia (in Gauja river basin) 142 Characteristics of groundwater bodies delineated in Estonia (inside Koiva river basin) 152 Groundwater monitoring points in Gauja-Koiva river basin 162 Map of groundwater monitoring points in Gauja-Koiva river basin 163 3 GroundEco “Joint management of groundwater dependent ecosystems in transboundary Gauja -Koiva river basin” ABBREVIATIONS EC – European Commission EU – European Union GDTE – groundwater dependent terrestrial ecosystems GWB – groundwater body GWD – Groundwater directive TVs – threshold values WFD – Water Framework Directive 4 GroundEco “Joint management of groundwater dependent ecosystems in transboundary Gauja -Koiva river basin” INTRODUCTION Groundwater dependent terrestrial ecosystems (GDTE) are ecosystems that rely upon groundwater, e.g. fens, spring flushes, swamp forests. Significant changes in groundwater chemical composition (quality) and/or groundwater levels (quantity) can damage the quality of GDTE or even destroy it. GDTEs provide important ecosystem services such as regulation of water cycle, drinking water and other resources, pollution filtering, peat and carbon accumulation, unique biodiversity, interconnection with other ecosystems (landscape functioning), recreational and scenic value, and cultural heritage. According to the EU Water Framework Directive (2000/60/EC), the whole groundwater body (GWB, a management unit set by each Member State) is considered in poor status if anthropogenic pressure on groundwater causes significant damage to GDTE. Then, specific actions (in WFD – programmes of measures) must be planned and carried out to improve the status of GWB and thereby, restore the quality of damaged GDTE. Groundwater is a dynamic system which cannot be divided by human drawn boundaries such as country borders, and many valuable GDTEs depend on the quality of these water resources. From a hydrological viewpoint, the transboundary Gauja-Koiva river basin has a joint water cycle. It means that human induced activities (e.g. water extraction or pollution) on one side of the border can affect groundwater and associated ecosystems on the other side. Thus, without joint activities and cooperation it is impossible to sustainably manage transboundary natural resources in the long term. A theoretical approach on how to identify, assess, and monitor GDTEs has been previously developed in Estonia. Similar climatic and hydrogeological conditions allowed us to adapt the methodology to Latvia and jointly update it to fit the needs of both neighboring countries – Estonia and Latvia. During Interreg Estonia- Latvia project Est-Lat62 “Joint management of groundwater dependent ecosystems in transboundary Gauja-Koiva river basin” or GroundEco project, joint methodology for identification and assessment of GDTEs was developed which was used to identify GDTEs in transboundary Gauja-Koiva river basin. The methodology and best GDTEs assessment techniques were tested in two pilot areas – Matsi spring fen in Estonia and Kazu leja valley in Latvia. Finally, recommendations for better GDTEs monitoring and future works were developed. All results will be used to support the development of 3rd cycle River Basin management Plans (2021–2027) for Estonia and Latvia. We hope that this report will be useful for many habitat and hydro(geo)experts working with assessment of GDTEs in line with European Water Framework Directive as well as serves as a good starting point for better understanding of GDTEs functioning and linkage with groundwater resources. Authors: Retike, I.(1,3), Kalvāns, A.(3), Priede, A.(5), Tarros, S.(7), Terasmaa, J.(2), Türk, K.(4), Bikše, J.(3), Demidko, J.(1), Koit, O.(2), Küttim, M.(2), Lode, E.(2), Pärn, J.(2), Popovs, K.(3), Vainu, M.(2), Valters, K.(1), Abreldaal, P.(2), Babre, A.(3), Bīviņa, I.(6), Caune, K.(1), Marandi, A.(7), Polikarpus, M.(7), Raidla, V.(7), Rieksta, M.(6), Sisask, K.(2) 1. Latvian Environment, Geology and Meteorology Center (Latvijas Vides, ģeoloģijas un meteoroloģijas centrs) 2. Tallinn University, Institute of Ecology (Tallinna Ülikool) 3. University of Latvia, Faculty of Geography and Earth Science (Latvijas Universitāte, Ģeogrāfijas un Zemes zinātņu fakultāte) (Latvia) 4. Ministry of Environment (Keskkonnaministeerium) (Estonia) 5. Nature Conservation Agency (Dabas aizsardzības pārvalde) (Latvia) 6. Vidzeme Planning region (Vidzemes plānošanas regions) (Latvia) 7. Geological Survey of Estonia (Eesti Geoloogiateenistus) (Estonia) This document reflects the views of the authors. The managing authority of the programme is not liable for how this information may be used. 5 GroundEco “Joint management of groundwater dependent ecosystems in transboundary Gauja -Koiva river basin” 1. Description of GroundEco project Project “Joint management of groundwater dependent ecosystems in transboundary Gauja-Koiva river basin (GroundEco)” is being implemented
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