Kestutis Kadunas & Juozas Mockevicius Geological Survey of Lithuania Groundwater monitoring system in Lithuania: does it satisfy WFD requirements? monitoridgas Kestutis Kadunas & Juozas Mockevicius Geological Survey of Lithuania

Main groundwater management units (GWB) (problematic area's)

Principle for delineation Hydro-dynamically connected systems of aquifers (national GW bodies): water abstraction; geological boundaries (conditional) geochemical boundaries (saline water contour). GWB use of which can affect surface water resources or other ecosystems

Schematic diagram of GWB

Hierarchy of groundwater monitoring National monitoring = Surveillance Municipality level (fill space between national and economic entities levels, more information systems) Economic entities levels (enterprises)=operational Water uses Potential polluters

Groundwater monitoring: interface between national and local

Structure of the Groundwater Monitoring in Lithuania

Density of monitoring network GW body No. of wells Total Surveillance Operational Density Well/100km2 D3+2 315 93a 182/40b 1.8 P2+D3 207 60 121/26 2.7 D3 128 16 85/27 2.5 Cz-Mz 286 62 186/38 3.4 Q1+Q2 1026 53 887/86 4.0 a = national b potential polluters/ water users

Periodicity Surveillance monitoring Qualitative status 1-2 times/year (main ions) 1 time/2-3 years (specific compounds) Quantitative status (level) 1-5-10 times/month Operational monitoring Qualitative status (water users & potential polluters) 2-4 times/year (main ions, specific compounds) 1 time/2-3 years Quantitative status 5-10 times/month (level water users) 4 times/year (water abstraction) 2-4 times/year (potential polluters)

Presentation of the results Qualitative status Quantitative status