EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Post-extraction of flood hydrographs under limited and heterogeneous information: Case study of Western Attica event, November 2017

Charalampos Ntigkakis1, Maria Nezi2, and Andreas Efstratiadis3
Charalampos Ntigkakis et al.
  • 1University of Bristol, Faculty of Engineering, Department of Civil Engineering, Bristol, United Kingdom (
  • 2HR Wallingford Ltd, Flood and Water Management Group, Wallingford, United Kingdom
  • 3National Technical University of Athens, Department of Water Resources & Environmental Engineering, Athens, Greece

In November 2017, a storm event of substantial but unknown local intensity caused a flash flood in Western Attica, Greece, which was responsible for 24 human fatalities and large-scale economical losses. Our focus is to the neighbouring catchment of Sarantapotamos, which has been equipped with an automatic stage recorder that was destroyed during the rising of the flood. Our overall objective is the estimation of the rainfall over the broader area of interest, through a reverse rainfall-runoff modelling approach at this specific catchment. Several sources of information are accounted for in order to reproduce the “observed” flood hydrograph, including photos and videos. We then employ Monte Carlo simulations to evaluate the uncertainty induced from limited and even missing data. Utilising the outcome of these analyses, we provide probabilistic estimations of the modelled rainfall, as well as risk evaluations, by estimating the maximum intensities and associated return periods of the storm event across multiple time scales.

How to cite: Ntigkakis, C., Nezi, M., and Efstratiadis, A.: Post-extraction of flood hydrographs under limited and heterogeneous information: Case study of Western Attica event, November 2017, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-18262,, 2020

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Presentation version 1 – uploaded on 03 May 2020
  • CC1: Comment on EGU2020-18262, Panayiotis Dimitriadis, 06 May 2020

    In your opinion, what were the main reasons an immediate evacuation in the flooded areas did not occur?

    • CC2: Reply to CC1, Michael Peter Schwab, 06 May 2020

      I agree

      • CC3: Reply to CC2, Michael Peter Schwab, 06 May 2020

        Sorry about my post. It was a mistake

    • AC1: Reply to CC1, Charalampos Ntigkakis, 06 May 2020

      By looking at the observed rainfall data, it is apparent that the recorded rainfall in the wider area is not sufficient enough to cause such a flooding. Another indication is that the station located in the city of Mandra, did not record any rainfall for several hours prior to the flood. It was denifitely a very intense storm that was not observed by any of the surroundind meteorological stations. 

      • CC4: Reply to AC1, Panayiotis Dimitriadis, 06 May 2020

        Thank you for your reply.