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Characteristics of water supply works

Last Updated February 4, 2025

There are various types of water supply work, but we will explain "renewal work" to replace aging pipes that are normally performed with new pipes.
It takes longer than to fill the new pipe and remove the old pipe while using the existing water pipe, so it takes longer than to fill the new pipe.
We apologize for any inconvenience during the construction, but we ask for your understanding and cooperation.
In addition, this construction is divided into five constructions as shown in the following construction image.


  • In the construction, we use a low-noise machine to reduce the vibration noise of the construction, but if the pavement is thick, vibration noise will be generated when demolishing.
  • In order to allow people and cars to pass, as shown in the following construction image, the work of digging and burying soil will be repeated four times each construction is performed. It seems that construction can be done at once, but if you perform construction while passing water through the existing water pipe, it will take some time, so decide the area where the road can pass on the same day and dig or fill it It will be. In addition, the restoration of the road is a temporary temporary restoration because it is necessary to dig repeatedly.
  • Depending on the type and scale of the construction, many water works will be carried out while moving the construction site according to the progress of the construction.
  • The number of construction days varies depending on the scale and type of construction and whether the conditions for easy construction are in place.
  • If the road width is narrow, the road may be closed and construction may be performed.
  • Due to the replacement of water pipes due to construction, water outages may occur.
  • This construction order is for reference only and may differ from the actual one.

Construction order

Test drilling

Image of a test drilling

Investigate the exact position of pipelines buried under the road and restore the road temporarily.

New construction of distribution pipes

Image of new water pipe construction

We install new water main and perform temporary restoration of road.

Replacement of water supply pipe

Image of water pipe replacement work

We replace water supply pipe (personal ownership) from each household with new water main and perform temporary restoration of road.

Removal of existing distribution pipes

Image of existing water pipe removal work

We remove aging pipe which we used until now and perform temporary restoration of road.

Road restoration work

Image of road restoration work

Roads that had been temporarily restored until now will be returned to full-scale pavement.

For inquiries regarding water supply, please contact the Water Works Bureau Customer Service Center.

Water Works Bureau Customer Service Center

Telephone: 045-847-6262 Fax: 045-848-4281
※Please be careful not to make a mistake.

Inquiries to this page

Water Works Bureau Facility Department Technical Management Division

Telephone: 045-331-6600

Telephone: 045-331-6600

Fax: 045-332-5476

Email address: su-gijutsukanri@city.yokohama.lg.jp

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Page ID: 647-878-148

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