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Updated design runoff coefficients

  • 24 July, 20229 November, 2022

We have worked with the Vinnova project SECURE – StormwatEr planning for inCreased Urban REsilience, which is a collaboration between StormTac, Tyréns and Luleå University of Technology. It is an international literature study for a comparison of commonly used calculation methods and used design rain as well as return times and climate effects, and of their impact on the design of transport systems and stormwater facilities for flow detention.

The literature study concluded that determination of runoff coefficients is the most uncertain parameter that also has the greatest impact on the resulting design flow and required detention volume. Suggestions have been made for new Design runoff coefficients, including a new proposed method (equations) for calculating new runoff coefficients as a function of return time (years) and rainfall intensity (l/s/ha).

The new typical runoff coefficients were developed from an extended literature study with new and revised runoff coefficients compiled in StormTac Database. The values ​​are now available in the StormTac database and StormTac Web together with comments on recommended minimum and maximum values.

Updated typical concentrations for stormwater per land use, as a result of the updated database
New article: Methods for Calculation of Stormwater Treatment Required for Meeting Receiving Waters Quality: Application in a Case Study

Recent Posts

  • New article: Methods for Calculation of Stormwater Treatment Required for Meeting Receiving Waters Quality: Application in a Case Study 28 November, 2022
  • Updated design runoff coefficients 24 July, 2022
  • Updated typical concentrations for stormwater per land use, as a result of the updated database 28 June, 2022
  • New land use: Permeable pavement 1 June, 2022
  • Improved recipient model with calibration 25 April, 2022
  • Improved function for calculating distributed acceptable load on recipients 25 April, 2022

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