Determination of hydraulic characteristics of flood event on december 01, 2005 on metsovitikos river, epirus prefecture, north greece

This study was commissioned by the construction J/V of the Metsovitikos HEP in order to support a legal insurance claim after suffering damages on the J/V worksite and equipment following a flood event on Metsovitikos River on 1.12.2005. The study estimated the magnitude of the flood event and its frequency, based on available data. The flood peak rate was estimated with the slope-area method after surveying suitable cross-sections of the affected river reach. Local hydrometry data collected at the Meg. Peristeri gauging station was used in the assessment. The flood peak rate was determined to be 265 m³/s and the flood event return period as 25 – 30 years. The theoretical 20-yr flood event was calculated using soil cover and land use data on the catchment and via modeling with the SCS method. The storm design depth was adopted from the IDF relationship of the nearby Mik. Peristeri station. The calculation showed that even assuming very conservative values for the modeling parameters, the theoretical 20-yr flood event peak rate was lower than the estimated at-site, exceeding the limit which the client was insured against.
The study estimated the magnitude of the flood event and its frequency, based on available data. The flood peak rate was determined to be 265 m³/s and the flood event return period as 25 – 30 years. The calculations showed that even assuming very conservative values for the modeling parameters, the theoretical 20-yr flood event peak rate was lower than the estimated at-site, exceeding the limit which the client was insured against.