Flood risk, in the sense of damage that a ‘flood event’ can cause, was globally indexed and quantified to show the relationship betweenvarious natural and social factors. The Pressure and Release (PAR) model consisting of five key indexes, namely hazard, exposure,vulnerability, capacity soft countermeasures, and capacity hard countermeasures along with the entropy method was used to measurethe uncertainty in information gathered. In this study, flood risk index was calculated for Yeşilırmak Basin of Turkey based on PAR.The basin is one of the coastal watersheds of Turkey experiencing frequent flood events. Damage data covering years from 2000 to2015 have been obtained from the Ministry of Agriculture and Forestry for Turkey. Candidate data for hazard, vulnerability, countermeasuresand exposure were collected in accordance with temporal and spatial scales, and the collected data were compiled on awatershed basis. When grouping the sub-indicators, AWDO (Asian Water Development Outlook) was used and selected from a groupof parameters covering a wide range of characteristics such as economy, health, vegetation, population, river according to their globalpresence, and data consistency. As long-term data accessibility was highly limited under basin conditions, data was obtained fromrelatively more reliable global sources such as United Nations’ databases on which data has been collected annually. The correlationamong the collected parameter values was calculated based on the amount of damage that had occurred, and data with high correlationwas included in the index account. Parameters that were not screened were rather weighted by using the entropy method and theireffect on flood damage were determined. The calculated flood risk index based on PAR model was named as Yeşilırmak Basin FloodRisk Index (Y-FRI).The resulting Y-FRI radar charts indicated that the most important variation occurred for the soft countermeasure index. In addition,the five main indices and the flood risk index was positively correlated with hazard, exposure and vulnerability indices, while negativelycorrelated with the countermeasures. This study showed that not only the hazard parameters directly contribute to flood formation, butalso the vulnerability, exposure and countermeasure parameters that reflected the conditions of the region where the flood occurredhave quantitatively influenced the flood damage.