The Shinano river flows in the Niigata & Nagano prefecture. the river starts in the central mountain range Kobushi-ga-dake and flows for 367 km were at the end it has a 15.6 billion cubic meter outflow per year. the upper reach found in the Nagano Pref. is often called the chikuma river.the "chikuma" river has a major tributary called the sai river what starts in the mountain yari-ga-dake whereas the shinano river's is called the Uono river which collects along the high mountains between the Kanto district and the Nagano pref. This being the shinano river takes up a large amount of cetral Japan. Flood water is caused by three main sources;frontal rain of early summer (the rainy season Japan),typhoons that hit Japan from summer to Autumn, and snow melt water in spring. To handle the flood two structures were built: Myoken Weir (the newest) and the Oukouzu diversion (about 61 years old). The Myoken Weir's construction lasted from 1986 to 1989 and went without trouble. the Myoken Weir was built for three reasons; protect river bed from excessive erosion, another reason is to maintain stability of the flow upstream of the Weir, last is to support the coming national highway.
Shinano Work office
geophysical:
The Shinano river flows in the Niigata & Nagano prefecture. the river starts in the central mountain range Kobushi-ga-dake and flows for 367 km were at the end it has a 15.6 billion cubic meter outflow per year. the upper reach found in the Nagano Pref. is often called the chikuma river.the "chikuma" river has a major tributary called the sai river what starts in the mountain yari-ga-dake whereas the shinano river's is called the Uono river which collects along the high mountains between the Kanto district and the Nagano pref. This being the shinano river takes up a large amount of cetral Japan. Flood water is caused by three main sources;frontal rain of early summer (the rainy season Japan),typhoons that hit Japan from summer to Autumn, and snow melt water in spring. To handle the flood two structures were built: Myoken Weir (the newest) and the Oukouzu diversion (about 61 years old). The Myoken Weir's construction lasted from 1986 to 1989 and went without trouble. the Myoken Weir was built for three reasons; protect river bed from excessive erosion, another reason is to maintain stability of the flow upstream of the Weir, last is to support the coming national highway.