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Improved functions for quantification of uncertainties after scientific review

  • 19 March, 20209 October, 2020

Improved functions for quantification of uncertainties after scientific review

The revised and improved functions are the result of ongoing work in collaboration with Luleå Technical University with a scientifically reviewed publication on quantification of uncertainties in the StormTac Web application (Wu et al., 2020). The features use a method based on The Law of Propagation of Uncertainties (Taylor, 1994), where absolute uncertainties are calculated from relative uncertainties. This is described in the guide, with reference to the publication (Wu et al., 2020) for more detailed description.

The improvement uses a new function when different values are summed, which reduces uncertainty, while a multiplication gives increased uncertainty, according to a scientifically reviewed paper by Hedbrant and Sörme (2001). This new breakdown using different equations gives changed resulting relative uncertainties for total flow, total load and total concentration before and after treatment, respectively, with consequent changes in calculated absolute uncertainty.

As before, various absolute uncertainties for different substances are obtained, but based so far on assumed relative general uncertainties for concentrations and runoff coefficients from literature values. However, there is a continued collaboration with Luleå Technical University to develop specific uncertainties that take into account the uncertainty in concentrations for each substance and land use from StormTac’s database, as well as for runoff coefficients per land use. That work will be described in a new paper that will also be scientifically reviewed. Implementation of this more advanced uncertainty model is expected to take place within a few months.

News

18th of March, at the conference VAK2020 Jönköping

  • 3 March, 20209 October, 2020

18th of March, at the conference VAK2020 Jönköping

Come and meet four of us, on the 18th of March, at the conference VAK2020 (Vatten avlopp kretslopp) in Jönköping, Sweden. There you get the opportunity to ask us questions about StormTac Web and see us show the application live. We will be in Monter 35. Hope to see you there!

/StormTac Team

Recent Posts

  • Distribution of responsibilities – Distributed acceptable loads and required treatment between stakeholders within the catchment 12 December, 2020
  • Updated irreducible concentrations in StormTac database and in StormTac Web 27 November, 2020
  • Completed database with updated stormwater concentrations during different seasons and months 27 November, 2020
  • Updated database regarding new references, stormwater concentrations, reduction efficiencies and concentrations for overflow water 23 November, 2020
  • Updated database with a large number of new volume-weighted land-use specific concentration data and BMP reduction efficiencies 6 July, 2020
  • Updated method description 12 May, 2020

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