TBV (Technical Calculation System Water) was developed within the consortium SMED to support Sweden's reporting to HELCOM and follow up the national environmental objective zero eutrophication.
With TBV estimated load from land to the sea was calculated as well as the source apportionment of nitrogen and phosphorus. In addition to load calculations TBV also stored and managed a large amount of data. TBV was developed and used within the consortium SMED consisting of IVL, SCB, SLU and SMHI and the development of TBV was financed by the Swedish Environmental Protection Agency and the Swedish Agency for Marine and Water Management.
TBV was used to compile Sweden's data for reporting to HELCOM under the Pollution Load Compilation (PLC). Apart from the PLC calculations, TBV was also used for calculations to follow-up the Swedish environmental target "Zero Eutrophication". The calculations were made on behalf of the Swedish Environmental Protection Agency and the Swedish Agency for Marine and Water Management.
From PLC8 is not TBV used anymore. The loads are instead calculated by the HYPE model and made available through Vattenwebb or the Vattenwebb archive. Input data and results from PLC8 are also made available at SMED Vatten's web page about PLC8 and by Swedish Agency for Marine and Water Management.
Some of the input data and results in terms of gross and net load to sea are available at SMED Vatten's web pages:
Note!
The calculations are made with different methods and can thus not be compared.
Before TBV was constructed did SLU and SMHI calculations for the TRK project (PLC) of the source apportionment for year 2000.