CC-WaterS: ERDF partner03 profile



Environmental Agency of the Republic of Slovenia (EARS)
Hydrogeological Analysis Division
Vojkova 1B
1000 Ljubljana
Slovenia
www.arso.gov.si

main focus of institution and department
The Environmental Agency is a body of the Ministry of the Environment and Spatial Planning. It performs expert, analytical, regulatory and administrative tasks related to the environment at the national level. Thus the Agency's mission is to monitor, analyze and forecast natural phenomena and processes in the environment, and to reduce natural threats to people and property. These tasks are performed by the national services for meteorology, hydrology and seismology.
The main task of Hydrogeological Analysis Division is groundwater quantity status assessment for Slovenia and reporting for EU Commission according to WFD. On monthly level, the groundwater reserves for alluvial aquifers as well as for karst areas are estimated and reported to authorities. Yearly, the Hydrogeological Analysis Division prepares a groundwater quantity monitoring program.

short description of PP activities
In the CC-WaterS project, EARS is mainly involved in preparing and providing meteorological and hydrological data for the databases and in calculation of water balance and analysis of trends on the basis of changed climate parameters for the test areas.

description of test area
Two test areas have been chosen, the Mura valley and the Ljubljana field.
The Mura valley is located in the NE part of Slovenia. It is an alluvial plain with an area of approx. 540 km2, bounded by Goričko hills to the NE and by Slovenske Gorice hills to SW. Main rivers, flowing along the plain are the river Mura and the river Ledava. Mura valley is a tectonic unit of the Pannonian Basin, which is filled with Tertiary and Quaternary sediments - coarse grained terrestrial sediments (gravel, sand and silt). A shallow aquifer (which is the subject of discussion in the project) is mainly unconfined, extensive and highly productive (>50 l/s) with a mean permeability of 5·10-4 m/s. The mean thickness of saturated zone is 17 m and of unsaturated zone 4 m. The aquifer has a surface water interaction with the river Mura and the river Ledava. Under a shallow aquifer confined aquifer with Tertiary sediments is located with the mean thickness of more than 40 m and a mean permeability of 1·10-6 m/s. Beneath this aquifer thermal aquifer with average thickness of more than 200 m is placed and with mean permeability of 1·10-7 to 1·10-6 m/s. The phreatic groundwater in the Mura valley recharges mostly from the rainfall and from the rivers, the minor part comes from the bounded hills. River bank soils-dystric brown soils, ranker gleysols and rendzina prevail among soils in the Mura valley. Agricultural areas are the most abundant (73%), followed by forest (17%), urban areas (9%) and water bodies (1%). Water supply is estimated to 322 l/s (10.15·106 m3/year) as the data for private wells are not available. Excessive levels of nitrate and pesticides are found in ground water as well as in drinking water.
The Ljubljana field is situated in the central part of Slovenia and extends over an area of approx. 109 km2. It is a flat area surrounding by mountains high up to 1000 m a.s.l. On the northern part of Ljubljana field flows the alpine river Sava and through the city center flows the karstic river Ljubljanica. It is an area where the Alpine and Dinaric region joint. The capital of Slovenia, Ljubljana is located on Ljubljana field, between Dinaric karst region and the Julian Alps. The Ljubljana field is a part of the Ljubljana basin tectonic depression and has a thickness of up to 120 m of Pleistocene and Holocene fluvial sediments. Ljubljana Field is an unconfined intergranular aquifer. The phreatic groundwater in Ljubljana field recharges from the rainfall, the river Sava and via groundwater inflow from the Ljubljansko barje multi-aquifer system. The hydraulic conductivity of Ljubljana field sediments is very good, from 10-2 m/s in the central part, to 3.7·10-3 m/s on the borders of the plain. The groundwater level is deepest in the NW part of the field, 30 m namely, in the SE part of the field the groundwater level is 5 to 10 m below surface. The river Sava flows along the northern edge of the filed. It discharges several tenths to 1600 m3/s. The river is very important hydrodynamic element of Ljubljana field. Eutric riverbank soils and eutric or district brown soils prevail among soils in the Ljubljana field. Agricultural areas are the most abundant (43%), followed by urban areas (41%), forest (13%) and water bodies (3%). The public water supply was 966 l/s in the year 2008 (30.45·106 m3/year), the data for private wells are not available. The ground water quality is locally affected with organic pollutants and Cr(VI).

what does the partner bring into the project?
EARS has a lot of experience with preserving natural resources, observing, analyzing and forecasting natural phenomena and processes in the environment. Our experts have knowledge about how to reduce impact of natural hazards to the environment, to the people and property. We, as well, ensure high-quality hydrological and meteorological data on the regional and local scale.

benefits for the partner by participation in the project
First of all, by participating in the project, exchange of knowledge is expected and successful solutions on similar problems. With determination of drinking water resources availability according to climate change, water supply management for test areas and methodology for other groundwater bodies, including karst and fractured aquifers in order to optimise water extractions (public and private) and licensing, are expected. With information about impact of climate change, a safety plan (plan and measures) for extreme meteorological and hydrological events could be made.




main contact
Petra Souvent
Hydrogeological analyses and reports, GIS analyses

phone: +386 1 4784 539
fax: +386 1 4784 054
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