The issue addressed within the EWASE project centres on the assessment of the effectiveness and efficiency of Early Warning Systems (EWS) for medium sized river basins prone to flash floods. The approach pursued relates the concept of risk analysis to the evaluation of strategies for flood damage prevention through early warnings. For the assessment of EWS efficiency, the reliability of forecasts will be linked to the potential damage reduction - both as a function of forecast lead time. For this purpose, two basic factors will be compared: the reliability of the provided forecasts and the economic benefit of this information, e.g.in terms of avoided damages. In particular, the different steps of the warning production chain and their qualitative impact on uncertainty propagation and forecast reliability are reviewed. Also, the uncertain factors present in risk analysis and economic evaluation are analysed.

Author names: 
Schröter, K.
Ostrowski, M.
Quintero, F.
Corral, C.
Velasco-Forero, C.
Sepere-Torres, D.
Nachtnebel, H.P.
Kahl, B.
Beyene, M.
Rubin, C.
Gocht, M.
Year: 
2008
Reference: 

Schröter, K.; Ostrowski, M.; Quintero, F.; Corral, C.; Velasco-Forero, C.; Sepere-Torres, D.; Nachtnebel, H.P.; Kahl, B.; Beyene, M.; Rubin, C.; Gocht, M. (2008). Effectiveness and efficiency of early warning systems for flash-floods (EWASE). CRUE Research Report 1-5. www.crue-eranet.net.

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