This dataset contains the twice-weekly post-processed reforecasts for years 2017 and 2018. These reforecasts were created by post-processing the Copernicus Emergency Management Service's European Flood Awareness System (EFAS) reforecasts. The post-processing method used is the operational method for the EFAS (Oct 2021). These post-processed reforecasts were used in the evaluation of the post-processing method. Additional data used in the evaluation is also included. The python code used in the evaluation is provided. The python scripts contain functions for the calculation of verification metrics for both the post-processed and the non-post-processed reforecasts.