Monday, 24 May 2021

Snowmelt season runoff


 Snowmelt pattern with daily fluctuations in the stage level during fine weather is visible in the hydrograph above during the long flow recession in mid-May. But the signal is not very strong due to the below average snowpack this year, which has largely melted off already by mid-May. May is wetter than average with several rainfall events in early and late May.

We measured the discharge soon after a medium-sized flood (about 0.8m stage), when the stage had fallen to 0.64m with a discharge of 3.35 m3/s. The flow was swift with a maximum velocity of 0.9m/s.

In summary, much of the runoff over the past month was due to rainfall runoff rather than snowmelt runoff, compared to an average year.

Stage = 0.64m, Discharge = 3.35 m3/s