Q3-2 Is a rainwater regulating pond required with a development permit?

Facilities that temporarily store rainwater include `` retarding ponds, etc. '' due to the diameter of existing public sewerage outside the development area, and `` rainwater runoff control facilities '' due to the presence or absence of river improvement at the discharge destination. . The former must be installed according to the standard of development permission, and the latter must be installed according to the consent standard based on the ordinance.However, it is an installation area for "rainwater runoff control facility" and the installation of "retarding ponds" occurs. In this case, if a facility with a larger storage volume is installed, it will conform to both standards.

References to this answer

• About standard of "Yu Suichi etc."
  "Guide to Development Permits" - Technical Standards -Chapter 513
• Standards for "rainwater runoff control facilities"
  "Guide to Adjustment Ordinance"Part 2, Chapter 2, Article 18, Paragraph 2, Item 5

Contact for inquiries regarding this answer

• About various "guides"
  Housing and Architecture Bureau Residential Land Planning Division
• About examination of standard of "Yu Suichi etc."
  Environmental Planning Bureau Development Coordination Section
• About examination of standard of "rainwater runoff control facility"
  Road and Highway Bureau River Management Section
• Examination of overall standards
  Housing and Architecture Bureau Residential Land Examination Department

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