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January 11, 2013 issuance
As the preparation of disaster, ourselves can do.
Public information yokohama xtra yokohamano water No. 117
One .4 (PDF 2.66MB)
Two .3 (PDF 3.37MB)
Why of special feature water supply works is it? We investigate o!
Summary of 23 water supply business accounts financial statements
Water pipe of this photograph "is not in condition to take out new water pipe from packing". (photograph 1)
We bury underground after we cover water pipe with film made of cylindrical polyethylene when we bury water pipe more than 50 millimeters in diameter newly.
We say polyethylene sleeve method of construction, and this is method of construction developed in the United States and the U.K. in the 1970s. We prevent what water pipe and the soil touch directly by covering water pipe with film made of cylindrical polyethylene of approximately 0.2 millimeters of thickness and are effective in restraining corrosion of water pipe by electrochemic reaction to occur between water pipe and the soil.
Possibly there may be person who has seen that work to cover water pipe is the spot of water supply works and is performed.
In addition, pipe except water supply such as gas and electricity, the sewer is buried underground, too. We decide color in each company to know at first sight each other when we dug road what pipe it is and wind up tape of mark. Water supply use is blue.
Besides, in the case of water supply works, we add "W" of WATER (Wed) to the ground as mark when we temporarily backfill road in the middle of construction. (photograph 2)
Familiar water supply works has such an invention in town, too.
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