In late years there is surge of interest in nature, and people enjoying leisure near using river full of nature increase. Tendency to frequent occurrence includes drowning accident in river with this, too.
Ensuring safety of the verge is thing which should perform in the self-responsibility, but drowning accidents by flooding that is sudden in each place occur frequently as far as it is principle that can use freely and acts based on own wills such as fishing or playing in the water as far as we do not disturb public interest and activity of another person in river.
At idle place, it is fine and there is a heavy rain upstream and may rise suddenly if there is little rain. You utilize weather information and precipitation information, river water level information, and please enjoy river leisure.