changes in precipitation impacted on stream flows which decreased in "southern canada by about 8%" during the period covered in the study. trends in canadian streamflow have also been reported by zhang et al. for a 30-50 year period using the canadian reference hydrometric basin network database. it was reported that annual mean streamflow has generally decreased, with significant decreases detected in the southern canada. also monthly mean streamflow decreased for most months with greatest decreases in august and september. in march and april, significant increases in streamflow were observed suggesting the potential for greater spring flooding in large, gauged river systems. daily streamflow frequency increased significantly over northern british columbia and the yukon territory, and decreased significantly in southern canada, in all percentiles of the daily streamflow distribution. significantly earlier breakup of river ice and resulting spring freshet occur in british columbia consistent due to spring warming trends. there was no evidence to suggest changes in the frequency of heavy precipitation events (daily rainfall/snowfall larger than a threshold value which is exceeded by an average of three events per year) across canada.