Alexandre Gervais

The first 2 km section was completed in 1997, and it can hold the runoff of 50 mm of rain falling in one hour. The reservoir has drawn water from the river on more than a dozen occasions since it opened, and the Kanda River has not flooded during that time. Plans call for the tunnel to be extended to Tokyo Bay, literally creating a second, underground Kanda River.Wikipedia

Construction began in the 1980s of a diversion tunnel which could temporarily store excess water which historically has been a big problem causing flooding to thousands of homes during powerful typhoons or torrential downpours. The Kanda River Underground Diversion Channel is actually one huge tunnel built under major roads. The plan is to construct a 4.5-km tunnel, 13 m wide tunnel 40 meters below street level. Wikipedia

The practice of hanami is many centuries old. The custom is said to have started during the Nara Period (710–794) when it was ume blossoms that people admired in the beginning. But by the Heian Period (794–1185), sakura came to attract more attention and hanami was synonymous with sakura. From then on, in tanka and haiku, “flowers” meant “sakura.” Hanami was first used as a term analogous to cherry blossom viewing in the Heian era novel Tale of Genji. Whilst a wisteria viewing party was also described, from this point on the terms “hanami” and “flower party” were only used to describe cherry blossom viewing.Wikipedia

Cherry blossoms and leaves are edible and both are used as food ingredients in Japan. The blossoms are pickled in salt and umezu and used for coaxing out flavor in wagashi or anpan. Salt-pickled blossoms in hot water is called sakurayu and drunk at festive events like weddings in place of green tea. Leaves, mostly Ōshima cherry because of the softness, are also pickled in salted water and used for sakuramochi. Since the leaves contain coumarin, however, it is not recommend to eat them in great quantity.Wikipedia

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Hanami (花見, lit. ”flower viewing”) is the Japanese traditional custom of enjoying the beauty of flowers, ”flower” in this case almost always meaning cherry blossoms (桜 or 櫻 sakura), or ume blossoms (梅 ume). In modern-day Japan, hanami mostly consists of having an outdoor party beneath the sakura during daytime or at night. Hanami at night is called yozakura (lit. ”night sakura”). In many places such as Ueno Park temporary paper lanterns are hung for the purpose of yozakura.Wikipedia

In Japan cherry blossoms also symbolize clouds due to their nature of blooming en masse, besides being an enduring metaphor for the ephemeral nature of life, an aspect of Japanese cultural tradition that is often associated with Buddhistic influence, and which is embodied in the concept of mono no aware. The association of the cherry blossom with mono no aware dates back to 18th-century scholar Motoori Norinaga. The transience of the blossoms, the extreme beauty and quick death, has often been associated with mortality; for this reason, cherry blossoms are richly symbolic, and have been utilized often in Japanese art, manga, anime, and film, as well as at musical performances for ambient effect. Wikipedia

During World War II, the cherry blossom was used to motivate the Japanese people, to stoke nationalism and militarism among the populace. Japanese pilots would paint them on the sides of their planes before embarking on a suicide mission, or even take branches of the trees with them on their missions. A cherry blossom painted on the side of the bomber symbolized the intensity and ephemerality of life; in this way, the aesthetic association was altered such that falling cherry petals came to represent the sacrifice of youth in suicide missions to honor the emperor. The government even encouraged the people to believe that the souls of downed warriors were reincarnated in the blossoms.Wikipedia

During the Heian Period (794–1191), Japanese sought to emulate many practices from China,[citation needed] including the social phenomenon of flower viewing (hanami: 花見), where the imperial households, poets, singers and other aristocrats would gather and celebrate under the blossoms. In Japan, cherry trees were planted and cultivated for their beauty, for the adornment of the grounds of the nobility of Kyoto, at least as early as 794. In China, the ume “plum” tree (actually a species of apricot) was held in highest regard, but by the middle of the ninth century, the cherry blossom had replaced the plum as the favored species in Japan.Wikipedia