The Narva River has its source in Lake Peipsi and flows into the Gulf of Finland. It passes through Estonia and Russia along its course. Estonia is a member of the European Union while Russia is not. In addition to this, the two countries use completely different techniques for discharge estimation. This all creates difficulties in river runoff calculations, affecting calculations of pollution load, providing data inconsistencies when the countries report to the Helsinki Commission (HELCOM) as they are required to. Besides this, the river has a unique feature called the “backwater effect”, which affects the stage–discharge relationships; thus, the usage of simple stage–discharge rating curves leads to a lot of errors.
The differences between the discharge numbers from two countries can reach up 80% for certain months.
The NARVAWATMAN project, which was implemented under the European Neighbourhood Instrument and co-financed by the European Union, strived to analyse the existing discharge estimation techniques, conduct additional field measurements, come up with a new harmonised solution, and provide recommendations for future analysis in the runoff estimation of the Narva River [
1].
Author Contributions
Conceptualization and methodology, Y.K. and A.R.; formal analysis, Y.K. and A.R.; data curation, Y.K.; writing—original draft preparation Y.K.; project administration, A.R. All authors have read and agreed to the published version of the manuscript.
Funding
This research was funded by the Project ER25 NarvaWatMan (Water Management of the Narva River: harmonization and sustention) under the European Neighbourhood Instrument and co-financed by the European Union (
https://estoniarussia.eu/ (accessed on 1st of September 2023)). The Taltech ID of this project is V19016.
Institutional Review Board Statement
Not applicable.
Informed Consent Statement
Not applicable.
Data Availability Statement
The data presented in this study are available on request from the corresponding author. The data are not publicly available due to its being a part of the project activity and it wasn’t planned to grant public access.
Acknowledgments
This study was carried out within the project “Water management of the Narva River: harmonization and sustention”, funded by the Estonian EU external border programme for 2014–2020 and supported by the partners.
Conflicts of Interest
The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.
Reference
- Water Environmental Engineering Research Group. NarvaWatMan Project, Final Report; Water Environmental Engineering Research Group: Tallinn, Estonia, 2022. [Google Scholar]
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