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Implementation in StormTac Web of new guidelines for stormwater…

  • 27 May, 20189 October, 2020

Implementation in StormTac Web of new guidelines for stormwater treatment in existing areas or areas of exploitation

Measures need to be investigated regarding what is required to achieve good water status in lakes and streams. Treatment requirements must be made when planning areas for new building and rebuilding. The requirements differ depending on in which recipient catchment area the study area is located. To know if pollutant treatment is necessary in existing and exploited areas, calculated acceptable load (kg/year) per recipient and substance should be used. This acceptable load has been calculated since many years in StormTac Web. However, in this new development of the model the acceptable load (kg/year) is distributed over the total area (ha) in the watershed area to the recipient, to be used as guideline for treatment of an existing or planned area. This results in specific calculated acceptable load (kg/year) for the area of exploitation which is a much more relevant and effective criteria to work against when designing treatment facilities for the area, compared to working against outlet concentration criteria (µg/l).

If the calculated load from the area is greater than its calculated acceptable load, a treatment action is required to decrease the load from the area. An action type can be any type of stormwater treatment facility, supplemented with a flow detention function if necessary. To get adequate treatment, different types and series-coupled facilities of the same or different types can be tested in different combinations. Another type of action to cope with required treatment may be to reduce the rate of exploitation.

This new feature of StormTac Web can be used as an effective tool for municipalities working with their action plans to design treatment facilities in their planned areas of exploitation to achieve good water status in the receiving waters.

News

Updated StormTac database v. 2018-05-09

  • 9 May, 20189 October, 2020

Updated StormTac database v. 2018-05-09

1. Complemented reference data of stormwater from different land uses. Especially complemented with by StormTac compiled flow proportional data as mean values from many US sites from the data base NSQD (2015), with much data from a large number of substances.
2. Added land uses (since earlier included in StormTac Web) with stormwater standard concentrations:
– Multi-family area with street trees in a skeletal soil (macadam-soil mixture) without Local disposal of stormwater in the block.
– Multifamily area with street trees in a skeletal soil (macadam-soil mixture) with Local disposal of stormwater in the block.
– Multifamily area with biofilter without local disposal in block
– Multifamily area with biofilter with local disposal in block
– Office area with street trees and skeletal soil (macadam-soil mixture) and blocks without local disposal
– Block without road with local disposal of stormwater.
3. Updated BaP-values in stormwater from the land uses:
– Residential area with total local disposal of storm water
– Terraced area with total local disposal of storm water

Recent Posts

  • Uncertainty inherent to a conceptual model StormTac Web simulating urban runoff quantity, quality and control 11 February, 2021
  • 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

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