Winter stage data download

31 Mar: Runoff is 7.02 mm/day

Today I downloaded both the stage loggers (Kadec, Hobo) to evaluate the winter season runoff. The hydrograph below shows that there are multiple peaks due to the high frequency of rainfall and the absence of any significant snowfall in the basin this winter. Winter rain-on-snow is not unusual for this basin, however, the hydrograph below shows particularly high rainfall activity for winter due to the record warm temperatures. Even over the basin elevation range of 40-950 m, the dominant precipitation phase was rainfall.

Notable runoff events include:

Date                    2-day precip.   Max. intensity
8-9 January            74 mm              9.5 mm/h
16-17 February      50 mm              5 mm/h
10-11 March           39 mm              7 mm/h
27-28 March           41 mm              7 mm/h

The 52 mm of precipitation on 8 January tied with the record for the highest daily precipitation measured in January. The 9.5 mm/h maximum precipitation intensity was the second highest for January (since 1982).