Natural disasters in particular have resulted in several economic losses that are resulting from an exponential increase in the number of economic losses in general across the globe. The floods are among the most severe natural hazards phenomena that affect the people aroung the world. Due to this fact, the identification of zones highly susceptible to floods became a very important activity in the researchers works. In this context, the present research work aims to propose the following 3 novel ensembles to estimate the flood susceptibility on Putna river basin from Romania: UltraBoost-Weights of Evidence (U-WOE), Stochastic Gradient Descending-Weights of Evidence (SGD-WOE) and Cost Sensitive Forest-Weights of Evidence (CSForest-WOE). In this regard a sample of 132 flood locations and 14 flood predictors was used as input dataset in the 3 aforementioned models. The modelling procedure performed through a ten-fold cross-validation method revealed that the SGD-WOE ensemble model achieved the highest performance in terms of ROC Curve-AUC (0.953) and also in terms of Accuracy (0.94). The slope and distance from river flood predictors achieved the highest importance in terms of flood susceptibility genesis, while the aspect, TPI, hydrological soil groups and plan curvature have the lowest influence in terms of flood occurence. The area with high and very high susceptibilty represents between 21% and 24% of the Putna river basin from Romania.