Comparing statistical post-processing of regional and global climate scenarios for hydrological impacts assessment: a case study of two canadian catchments

•The value of RCM for hydrological impact studies is investigated.•Some uncertainties in the projections of streamflow are explored.•An ensemble of bias corrected RCM simulations driven by two GCM ensembles is used.•The uncertainty of natural variability on streamflow projections is emphasized.•Both the RCM and GCM provide comparable assessments of climate change on streamflow.