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We analyse the flood event of 8 July 2002 that caused overflows overportions of the lower reach of the Kifissos River/Canal. The storm coveredonly the lower basin area and was concentrated on the centre and thesouthwest side of Greater Athens. The issue that stirred the public opinionwas whether the hydraulic works underway in lower Kifissos at that time wereresponsible for the overflows. We explore this issue with thehydrologic-hydraulic model of the Kifissos basin TELESIM. To shed light onthe probable cause of the observed flooding, we ran TELESIM for tworain-field scenarios derived from the recorded point-rainfalls, computingflows for each scenario. Depth profiles for channel conditions withoutobstructions do not explain the observed flooding. With the channel taken aslocally obstructed by flow-area reducing ramps plus bed-debris, estimatednominal overflows (bank-full level is threshold, but the water stays insidethe channel) compare well with actual ones for the milder rainfall scenario.Hence, the simulations support as plausible the hypothesis that flowobstructions due to the construction caused the overflows

The 8 July 2002 storm over Athens: analysis of the Kifissos River/Canal overflows