Is water of Yokohama somewhere and others?

Water source of Yokohama is 5 systems of the Doshi River, Sagamiko, Banyu River, company group Sakawa River, company group Sagami River.
After cleaning in method of water purification called rapid filtration method (in Kawai film filtration method) at water purification plant of three city of Kawai, Nishiya, willow tit and four water purification plant of wide area Channel company corps (※) in Kanagawa, and performing water quality test, and having confirmed security, water of these 5 systems is saved in distributing reservoir of 22 city. We send from there to house of everybody with water pipe.

(※) Yokohama-shi, Kawasaki-shi, Yokosuka-shi, Kanagawa is public, and wide area Channel company group in Kanagawa invests and it produces tap water and sells to investment 4 group.

• Water source of Yokohama-shi

Modern channel of Yokohama was completed for the first time in Japan in 1887 (Meiji 20) 130 years ago.
Modern water supply is water supply which is using currently which pressures with water pipe of iron, and sends water which we cleaned by filtration to faucet.
Population of Yokohama rapidly increased after port was opened in 1859 (Ansei 6), but, only with water which was salty even if a lot of places that filled up the sea and marsh dug well, lacked drinking water.
Therefore we asked Henry Spenser Palmer of British engineer for plan of Yokohama Channel and constructed for two years six months and completed modern times Channel.

• History of Yokohama Channel

"Way will forest at the head of a river" of Yokohama-shi is in one, Doshi-mura, Yamanashi of water source of Yokohama.
We purchased the forest of Doshi-mura from Yamanashi in 1916 (Taisho 5) to follow the quality of the water of "the Doshi River" which was one of the precious water sources of Yokohama-shi. We own forest at the head of a river of 2,873 hectares equal to about a one-third of Doshi-mura and are managing now. In forest at the head of a river, "we save water" is said to have three roles (water source cultivation function), "we purify water" "relaxes flood".

• Way will forest at the head of a river

The forest which Yokohama-shi owns maintains "we save water" premeditatedly so that three roles of water source cultivation to "relax flood" can serve as "we purify water".
On the other hand, volunteer groups of Yokohama-shi where Water Works Bureau called push forward the forest maintenance such as thinning as the forest which is not well-kept increases, and forest under private ownership of Doshi-mura has decreased water source cultivation function.

• Way will forest at the head of a river
• Way will forest at the head of a river volunteer business
• Forest instructor system of way will

Even citizen's all of you who could not participate in volunteer activity directly installed fund to be able to participate in water source maintenance activity in form called fund cooperation widely.
As for this fund, it is from contribution from all of citizen, company, the groups and a part of sales of plastic bottle "true children The Water".

• Hajime Mori iron of oldness and way will of water