Evaluating global/regional impacts from possible climate change on urban drainage requires a methodology to estimate extreme and short-duration rainfall statistics for the time period and the geographical region of interest. The generation of daily series of future climate projections for each selected model output is based on the SRES (Special Range of Emissions Scenarios) A1B.
This scenario represents an average future condition based on a 2-degree warming trend. With a higher warming trend, the expected impacts will be much higher than the calculated. This study has opted to involve the other two extreme emission scenario cases, A2 and B1, only in the annual rainfall evaluation phase and used the A1B emission scenario results for the future analysis.