Intensity-Duration-Frequency Curves at Ungauged Sites in a Changing Climate for Sustainable Stormwater Networks

Intensity-duration-frequency (IDF) curves representing the variation of magnitude extreme rainfall events with a return period and storm duration are widely used in hydrologic infrastructure design, flood risk management projects, climate change impact studies. However, many locations worldwide, short-duration rainfall-observing sites long records do not exist. This paper introduces new methodological framework for extracting IDF at ungauged transferring information from gauged ones relatively homogeneous climate. methodology is grounded on simple scaling concept based multifractal behaviour rainfall. A nonstationary Generalized Extreme Value (GEV) distribution fitted to annual monthly maxima site using moving-time window approach also applied consider effects changing curve construction. An application presented study Fourni, Crete, derive under conditions present implications proposed design sustainable stormwater network. The introduced this work results increased extremes up 20.5%, while newly designed network characterised by diameters its primary conduits, compared resulting fully stationary conditions.