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About purpose of water supply works

Last update date December 28, 2018

Until tap water is made

Tap water is prepared by the next process and sends to all of you.
Manufacturing process of tap water

Type of water pipe

Type of water pipe
AqueductFrom water intake point to water purification plant
Water lineFrom water purification plant to distributing reservoir
Water pipeFrom distributing reservoir to each domestic divergence part
Service pipe
(customer possession)
From divergence part of water pipe to faucet

Earthquake resistance of water supply facility

History was old, and, in the water supply facility of Yokohama-shi, in Kawai water purification plant, Nishiya water purification plant was completed as the modern water supply birthplace in Japan in 1915 (Taisho 4) in 1901 (Meiji 34). Because deterioration advances to this facility which supported the modernization of Japan, and there is thing which quake resistance lacks, we invite time of radical update, reconstruction and push forward earthquake resistance sequentially.
For example, we constructed earthquake resistance of the following distributing reservoir at Nishiya water purification plant.

Nishiya water purification plant whole view

(1)It is before the inside, reinforcement of distributing reservoir

(2)Reinforcement work of floor

(3)Reinforcement work of pillar


We assume earthquake from magnitude 7 to 8 and reinforce.
One side of width of pillar reinforces thickness of floor to 55cm from 25cm from 50cm to 100cm.

Earthquake resistance of water pipe

Thing which we maintained in large quantities for to about 9,000km and the water demand expansion period after the 40s of the Showa era invites update time to sohaisuikan in Yokohama-shi sequentially. Therefore we update pipe which became old causing leak of water explosion and the quality of the water deterioration to water pipe superior in quake resistance for earthquake disaster in Water Works Bureau sequentially.
As we update the whole city sequentially, we will construct update even if it is place that we are not constructing now in future, but understanding and cooperation between is becoming essential for this construction now.

Water pipe which there was hole in by corrosion

We prevent corrosion by winding up film made of polyethylene to new water pipe

Work scenery

New establishment of water pipe

In place where water pipe is not installed, we bury water pipe newly and, in the case of housing land development, install.

Inquiry about water supply to Water Works Bureau customer Service Center

Water Works Bureau customer Service Center

Telephone: 045-847-6262 fax: 045-848-4281
※You run, and please be careful not to make any mistake

Inquiry to this page

Water Works Bureau General Affairs Department General Affairs Division

Telephone: 045-671-3105

Telephone: 045-671-3105

Fax: 045-212-1155

E-Mail address [email protected]

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