Q&A on cliffs

A: If certain criteria are met, improvements can be made using one of the subsidy programs.
Please check the following web page and consult with the Building Disaster Prevention Section.
・Cliff disaster prevention measures construction subsidy program
(Might retaining wall, RC retaining wall, etc.)
・reduce disaster damage Construction Subsidy Program
(Slope protection, reinforcement of existing retaining walls, etc.)

A: Regarding the danger of retaining walls
Simple check "Is your retaining wall safe?" (PDF: 642KB)
And please see retaining wall check sheet (outside site) of home of Ministry of Land, Infrastructure, Transport and Tourism.
The dangers of retaining walls and natural cliffs need to be judged by geological surveys and specialized knowledge.
If you would like to make a detailed check, ask a geological survey company or expert.
In addition, there is a private consultation service by experts, so please use it at your own discretion.
If you are considering improvement, please consult with the Building Disaster Prevention Section.
I will explain the details and conditions of the grant.

A: Please consult with a contractor or construction company.
In the Building Disaster Prevention Section, in addition to consultation and guidance on subsidy systems for improvement work, etc.
When certain standards are met, we provide information on measures to prevent steep slope collapse in Kanagawa Prefecture.
In addition, when subsidy system is utilized, construction contract with supplier with headquarters in the city is necessary.

A: ・Remove large trees and overgrown trunks and branches on the slopes of cliffs as appropriate.
・Let's maintain drainage channels so that rainwater and sewage do not flow on the cliff side.
・Check the condition of the cliff after heavy rain, etc., and be sure to respond if it is about to collapse.
・Let's decide the evacuation method in advance in case of emergency.
・Improve retaining walls or cracked retaining walls as soon as possible.
・It is also effective to consult with specialists such as architecture and ground. （Expert consultation desk on cliffs）

A: We can confirm on Kanagawa earth and sand disaster information portal site (outside site).

A: There are no restrictions on earth and sand disaster alert areas.
We perform maintenance such as vigilance evacuation systems by city and common knowledge (information transmission) of vigilance evacuation.
In addition, the special alert area for landslide disasters is
In accordance with the "Law Concerning the Promotion of Sediment Disaster Prevention Measures in Sediment Disaster Warning Areas (Landslide Law)"
Permission system for specific development activities (sale of residential land, development activities for facilities requiring special attention)
And structural regulations of buildings are stipulated.
For details, please refer to this document (PDF: 443KB).

A: Generally, the maintenance and management of cliffs is the responsibility of the land owner, manager, occupant, etc.
In private land such as earth and sand disaster caution areas, we cannot carry out measures construction in city.
Provided, however, that if certain criteria are met;
Project to prevent the collapse of steep slopes in Kanagawa Prefecture or
You can use the subsidy program for disaster prevention and reduce disaster damage measures for cliffs in Yokohama.

A: Please consult with the Building Disaster Prevention Section.
We will check if you meet the business standards and guide you through the procedure.

A: We can confirm on Kanagawa earth and sand disaster information portal site (outside site).

A: Countermeasure facilities in steep slope collapse danger zone
Kanagawa Prefecture is carrying out construction and owning and maintaining it.
Regarding the location and type of facilities
Please consult the Yokohama Kawasaki Flood Control Office, Kanagawa Prefecture (Phone: 045-411-2500).

A: You may need to submit a report on acts such as creation, logging, and installation of structures.
When performing construction stipulated by law such as cutting, embankment, logging, etc. in steep slope collapse danger zone
Prior to the start of construction, permission from the Governor of Kanagawa is required.
Please consult the Yokohama Kawasaki Flood Control Office in Kanagawa Prefecture (Phone: 045-411-2500) for details of the procedure.

A: Retaining walls made of Otani stone, ganta stone, and cobblestone do not conform to current standards.
There is a risk of collapse due to heavy rain, earthquake, etc.
It is desirable to rebuild the building at the time of rebuilding the building.
If the building is close and there is a shortage of work space or due to cost issues
If it is difficult to rebuild, improvements may be made by reinforcement.
If certain criteria are met;
Yokohama City Cliff Disaster Prevention Measures Construction Subsidy Program (Rebuilding)
It is possible to use the Yokohama City Cliff reduce disaster damage Countermeasure Construction Subsidy Program (reinforcement, etc.).
Please consult with the Building Disaster Prevention Section.

A: Additional retaining walls are not permitted by law.
There are many cases of collapse due to heavy rain or earthquake, and there is a high risk, so early improvement is required.
It is desirable to rebuild, but if it is difficult, remove the additional stack and remove it.
There is also a way to return it to the slope.
If certain criteria are met;
Yokohama City Cliff Disaster Prevention Measures Construction Subsidy Program (Rebuilding)
It is possible to use the Yokohama City Cliff reduce disaster damage Countermeasure Construction Subsidy Program (reinforcement, etc.).
Please consult with the Building Disaster Prevention Section.

A: The city cannot cut down trees in private areas.
Article 233, Paragraph 1 of the Civil Code;
"When a branch of a neighboring bamboo tree crosses the boundary,
The owner of the bamboo tree can cut off the branch. "It is said.
Because the city cannot provide guidance based on the Civil Code,
It is necessary to ask the landowner to take measures such as logging directly.
If necessary, please consult with a lawyer.
The city hall and each ward office provide free lawyer consultation (reservation required).