Initial design of urban drainage systems for extreme rainfall events using intensity–duration–area (IDA) curves and Chicago design storms (CDS)

Dan Rosbjerg*, Henrik Madsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Due to more frequent extreme rainfall incidents in recent years, many large cities are considering construction of new drainage systems to cope with rainfall in the order of 100-year events. In such cases, T-year point rainfall events should be supplemented with areal reduction factors (ARF) to avoid overdesign. To facilitate an initial design, a procedure based on using Chicago Design Storms (CDS) in combination with intensity–duration–area (IDA) curves was developed to produce CDS-ARF input rainfall. By means of the time of concentration, a specific instantaneous unit hydrograph (IUH) was obtained for each subcatchment. Combination of CDS-ARF rains and the subcatchment IUHs using convolution integrals was used to produce inflow hydrographs to the drainage system. A sequential design procedure that successively includes subcatchments for the entire drainage system in the downstream direction is implemented and exemplified ensuring a consistent initial design.
Original languageEnglish
JournalHydrological Sciences Journal
Volume64
Issue number12
Pages (from-to)1397-1403
ISSN0262-6667
DOIs
Publication statusPublished - 2019

Keywords

  • Extreme rainfall
  • Area reduction factors
  • CDS storms
  • Sequential drainage design
  • Urban catchments

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