Monday 23 July 2012

Not much of a rainy season



This year, we did not have much of a rainy season here in Niigata. Southern Japan had torrential rains and flooding, but in Niigata we only had relatively light rains. The hydrograph above for Takiya River shows only minor floods, and by the end of July water levels are already quite low.

If we don't get more rain throughout the summer then we may be having water shortages. However, the spring and early summer snowmelt has topped up the groundwater levels which are so vital in maintaining river flows throughout the summer season.

As usual we measured the discharge to add further data to the stage-discharge relationship (H-Q curve). While doing this work, we could enjoy watching the "akatonbo" colourful dragonflies dancing above the river.

Stage = 48.5 cm, Tw = 17.7 C