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Observation results of groundwater level and ground contraction

Last update date May 22, 2023

The Institute of Environmental Science observes the groundwater level and ground contraction in the city.
On this page, we will inform you of the observation results.

Ground water level and ground shrinkage observed at the Institute of Environmental Science

The Institute of Environmental Science observes groundwater levels at 10 groundwater observation wells in the city to prevent land subsidence in soft ground areas. In addition, ground variations are observed at seven of these sites.

Survey point

The survey points are as shown in the figure below.

Location map of the survey site
Observation location map

Name of observation point

  • Ground water level observation point (* Ground contraction is also observed.)
    • Market Elementary School ※Yokohama Park ※Okano Koen ※Niwa Park ※Akibacho, Totsuka-ku ※Shin-Yokohama Ekimae Park ※Saedo Park ※Nishiterao Park, housing complex Yabe, Kamikurata housing complex (10 locations, 14 observation wells)
  • Locations where groundwater observations are conducted (blue-shaped)
    • Market Junior High School, Yako Elementary School, Yagami River Park, Minato Mirai 21 District, Sakonyama housing complex, Minamikibogaoka Junior High School, Megurocho Park

Survey results

Observation results of groundwater level and ground fluctuation

Observation results for FY2022 (2022)

Ground water level and ground fluctuation
Name of the observatory Water level change (m) Ground fluctuation (mm)
Market Elementary School

-0.07

-0.24
Yokohama Park 0.00 -0.60
Okano Koen 0.78 -0.06
Niwa Park -1 (80m) -0.28
Niwa Park -2 (40m) -0.18 -1.37
Akibacho, Totsuka-ku -0.03 -0.61
Shin-Yokohama Ekimae Park -1 (25m) -0.22 -0.16
Shin-Yokohama Ekimae Park -2 (70m) -0.21 -1.02
Shin-Yokohama Ekimae Park -3 (117m) -0.09 -1.53
Saedo Park -1(16m) -0.31 -1.66
Saedo Park -2 (88m) -1.00 -1.80
Nishiterao Park -0.11
housing complex Yabe -0.09
Kami Kurata housing complex -0.22

  • Deduction of observation data for March of the previous year and March of the observation year (in the case of missing, the previous observation value)
  • The negative (-) of ground fluctuation indicates contraction. Variable value for the current fiscal year, when the end of the previous fiscal year was set to zero.

Observation Records of each observatory

Previous year observation records

Ground water level and ground contraction observation graph from April 2018 to present

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Inquiries to this page

Research Institute for Environmental Science, Environmental Planning Bureau

Telephone: 045-453-2550

Telephone: 045-453-2550

Fax: 045-453-2560

E-mail address: ks-kanken@city.yokohama.jp

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Page ID: 491-330-763

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