A new tool for quantifying the hydrological effects of LID retrofit designs – the power of simplicity

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We developed a new tool to address the needs of utility companies in the early planning and design phase of LID for retrofitting in existing urban areas, where a high degree of collaboration among stakeholders with different professional backgrounds is needed. The tool uses simplified methods to assist the user in quickly assessing two key overall performance indicators of a LID plan: 1. Return period for overflow, and 2. Impact on the annual water budget of the catchment. The tool currently allows combining three types of stormwater control measures (SCMs) commonly used in LID: permeable paving, bioretention units and local detention ponds. We present a case study to illustrate the usefulness of the tool in the context of climate change adaptation in Copenhagen and discuss further development plans including more SCMs, better user interface and assessing the uncertainties introduced by the simplifications in the tool.
Original languageEnglish
Publication date2016
Number of pages7
Publication statusPublished - 2016
Event2016 International Low Impact Development Conference - Beijing, China
Duration: 26 Jun 201629 Jun 2016


Conference2016 International Low Impact Development Conference
Internet address


  • Low impact development
  • Water sensitive urban design
  • Sustainable urban drainage systems
  • Planning
  • Communication

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