This indicator measures the change in stream yield (volume of stream discharge per square kilometer of drainage area) over the period 1980-2011. This time period is used as it avoids years when changes in natural climate oscillations, which have been shown to have a significant impact on temperature and precipitation patterns, would have skewed results. Results are reported for both peak yield and late summer minimum yield. The term, ‘yield’, refers to the discharge of a stream normalized to its catchment area. Data from 36 active monitoring stations on unregulated streams are included in the analysis. Data for this indicator were gathered from the Water Survey of Canada and analysed by Dr. Janice Brahney at the University of British Columbia.