Climate changed rainfalls for urban drainage capacity assessment

Berggren, Karolina; Packman, John; Ashley, Richard; Viklander, Maria. 2014 Climate changed rainfalls for urban drainage capacity assessment. Urban Water Journal, 11 (7). 543-556.

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Guidance on what type of rainfall to use when assessing hydraulic capacity of urban drainage systems under climate change is unclear; focus is mainly on what climate factors to use. Based on a case study in Kalmar, Sweden, this paper compares system performance using two design rainfalls, Block rainfalls and Chicago Design Storm (CDS), and selected observed rainfalls, with two methods of addressing future climate: a constant factor and Delta Change (DC) factors that depend on rainfall intensity. The use of CDS rainfalls presents the maximum hydraulic response, whereas Block rainfalls give lower responses but identify critical durations in the system, which may be useful addressing adaptation actions. Observed rainfalls of target return periods gave similar responses to CDS rainfalls, and can be applied with DC factors to address future changes in both intensity and volume. Differences between the two methods indicate a high dependence related to the maximum factors applied on the rainfalls.

Item Type: Publication - Article
Digital Object Identifier (DOI):
UKCEH and CEH Sections/Science Areas: UKCEH Fellows
ISSN: 1573-062X
Additional Keywords: climate change, delta change, design rainfall, observed rainfall, rainfall-runoff analysis, stormwater modelling
NORA Subject Terms: Hydrology
Meteorology and Climatology
Date made live: 30 Oct 2014 11:22 +0 (UTC)

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