view the big map with a meters above the sea level graph
The Shinano River (367km), the longest river in Japan, has been troubled from ancient times by floods. The 10km long Ohkouzu-Bunsuiro(waterway), completed in 1924, was built to protect a grain area downstream of the Shinano River from floods. As for the 2km near to the sea, there are hills of around 100m in height, so a huge excavation resembling the Panama Canal was performed. |
It is calm weather today, but I heard the flow quantity during heavy rain is intensely, and the riverbed of the river mouth was dug to a depth more than 15m. |
In 2000, the second generation Araizeki was completed. This water gate controls quantity to the main stream of the Shinano River . 90.5Km/Total 7h |
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