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  • Bringing neighbours closer

    Bringing neighbours closer

    Welcome to the Interreg V-A Latvia–Lithuania Programme 2014–2020!

    About the programme
  • Bringing neighbours closer

    Bringing neighbours closer

    Welcome to the Interreg V-A Latvia–Lithuania Programme 2014–2020!

  • Bringing neighbours closer

    Bringing neighbours closer

    Welcome to the Interreg V-A Latvia–Lithuania Programme 2014–2020!

LLI-533 Joint management of Latvian – Lithuanian transboundary river and lake water bodies (TRANSWAT)

Achievement of good ecological and chemical status of water are main objectives of EU Water Framework Directive (WFD). Implementation of more effective measures in water bodies is the way to meet these objectives and improve water quality. As water cannot be divided by human drawn boundaries such as country borders, management of shared water bodies must be a joint effort.

The aim of TRANSWAT project  is to ensure joint assessment and management of trans-boundary river and lake water bodies which hydromorphological and/or ecological quality pose a risk for not meeting WFD’s requirements.

 

Three trans-boundary river basins (Venta, Lielupe and part of Daugava/Dauguva) are covered by this Program area where ecological status of many river and lake water bodies is below “good”. Moreover, some river bodies are designated as “heavily modified” due to substantially altered natural conditions – the result of flow regime regulation by Hydro Power Plants (HPPs) cascades. Right now mainly in Latvia lakes located on cross-border area between Latvia and Lithuania are delineated as water bodies. Consequently, water quality monitoring and pressure analysis of these lakes is carried out primarily on Latvian side.

Project will address two main components: (1) assessment and management of rivers affected by HPP’s cascades and (2) estimation and management of trans-boundary lakes ecological status and ecosystem health.

First component will cover evaluation of ecological flow (E-flow) in trans-boundary rivers regulated by HPPs cascades within Venta River Basin and proposal of amendment to national water legislation for mitigation of impacts created by such river flow regulation. During the field surveys hydomorphological and fish data will be collected for E-flow modelling needs in Lithuania (Varduva River, 5 HPPs) and Latvia (Losis River, 2 HPPs and Ciecere River, 3 HPPs). After, the most popular model for E-flow calculations in line with WFD’s requirements (MesoHABSIM) will be used. TRANSWAT project will use previously developed harmonized approach for E-flow modeling from Interreg Latvia-Lithuania project “ECOFLOW”. As well the project will perform E-flow calculations in web-based modelling platform which will be created by recently started LIFE GoodWater IP project. Based on E-flow assessment results, the modeling of HPP operations in cascade will be done using HEC-RAS model to ensure the ecological regime downstream of each HPP and sustainable water recourse management in general. Finally, an amendment to national water legislation for mitigation of impacts created by river flow regulation will be proposed based on developed results and recommendations.

Second component will assess ecological status of five trans-boundary lakes located in Lielupe and Daugava/Dauguva river basins. Three lakes are a part of NATURA 2000 network. New data will be gathered during water quality and quantity monitoring, and detailed biological and fish surveys. Then, combining new data with in depth analysis of lake catchments (such as assessment of surface-groundwater interaction and source apportionment modeling) the ecological status of five lakes will be evaluated. As well new joint methodology for lake ecosystem health assessment will be developed and then tested in pilot area. Finally, harmonized Latvia-Lithuania monitoring program (MP) and Program of Measures (PoM) will be established to ensure sustainability of project results and further improvement of water quality.

Social media and contacts:
Phone: +37167770029
E-mail: inga.retike@lvgmc.lv
Website: www.meteo.lv
Address: Maskavas street 165, Riga, Latvia, LV-1019

20 January 2021

First Habitat Surveys on Ciecere and Losis rivers in Latvia

The first Habitat survey of four planned on Losis River has been carried out during 19-21 October 2020  Hydrological measurements and river habitats mapping were conducted downstream Grantini  and Lejnieki HPPs operated in cascade regime. In accordance with work plan it has to be the survey in presence of minimum flow in the low flow period. However during the survey downstream Grantini HPP water was released through HPP turbines. As a result habitats were mapped for average water discharge. In a next day  measurements and habitat mapping have been repeated downstream Grantini HPP for low flow conditions.

 

On  Ciecere River the  Habitat survey has been carried out  11-13 November 2020. Hydrological measurements and river habitats mapping were conducted in three river stretches downstream Ciecere, Dzirnavnieki and Pakuli HPPs. It was first Habitat survey in presence of minimum water discharge in low flow period.

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20 January 2021

Initial Survey

The Initial Survey has been carried out on Ciecere and Losis rivers in order to select measurements sites in 15 October 2020.

As a result 3 places have been selected on Ciecere River for water level and water discharge measurements: upstream Ciecere HPP nearby lake Ciecere, between Ciecere and Dzirnavnieki HPPs in Saldus town and downstream Dzirnavnieki HPP. On Losis River has been selected 3 places as well: upstream Grantini HPP, between Grantini and Lejnieki HPPs and downstream Lejnieki HPP. Water level data loggers will be install in all above mentioned places.

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Last updated: 22.01.2021 10:16