18 April Rain-on-snow Event

 

In the stage hydrograph above you can see the moderate size flood caused by a rain-on-snow event during 17-19 April. You can also see the typical diurnal snowmelt runoff pattern which looks like a sine-wave with a steep rise and more gradual fall in water level each day. For Takane Amedas gauge, daily precipitation was 79 mm on 18 April with maximum intensity of 12.5 mm/h. Warm temperatures up to 13.4 degrees Celsius were measured in Murakami, with peak wind speeds of up to 21 m/s causing significant sensible heat transfer to the mountain snowpack. Total event precipitation was 105.5 mm at Takane.

However, today we visited Takiya River under perfect blue sky conditions for our survey and discharge measurement. The following photos show the discharge measurement and channel features around the gauging reach.