Trends in spring freshet timing (in days per decade with magnitude proportional to the size of the triangle) for 49 stations in unregulated streams from the Reference Hydrometric Basin Network (RHBN; see Box 6.1). Downward-pointing triangles represent earlier freshets and upward-pointing triangles represent later freshets. Green triangles indicate the trend is not significant. Significant trends denote that there is only a 5% possibility that such changes are due to chance. Data lengths range from 30 to 100 years.
Modified from Jones et al. (2015).