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About setting of rainwater runoff control facility

Last Updated August 22, 2024

From September 1, 2004, regulations about title of "the regulations about adjustment of Yokohama-shi development business" were enforced.

We show procedure document of rainwater runoff control facility to prescribe in regulations Article 18 Clause 2 fifth as follows.

Standards for Rainwater Runoff Control Facilities

[Standards] of No. 5 (rainwater runoff control facility) of Section 3 of Part 2, Chapter 2, "Procedures for Development Projects" of "Ordinance on Coordination of Yokohama City Development Projects" (hereinafter, [Standards]) ) It is as follows.

(1) [Standards] Rainwater runoff control facilities

It is standard of rainwater runoff control facility of guide of "the regulations about adjustment of Yokohama-shi development business".

(2) [Standards] Town name display of rainwater runoff control facility installation release area

In each ward town name display, if it is described as (part), detailed confirmation is required because the boundary of the installation exclusion area is divided by the town area. Please check separately at the counter in charge of consultation and guidance in the River Management Division.

(3) Rainwater runoff control facility installation release area map

In addition, setting may be exempted in area where rainwater runoff control facility is installed in land readjustment project enforcement area even in setting area. In this case, as well, please check the details at the window of the River Management Division Consultation and Guidance Section.

(4) Rainfall to be planned

"[Standards] 2 (4) C" The 30-year probability of 10-minute unit rainfall calculated from the probability rainfall intensity formula, and the 10-year probability of 10-minute unit rainfall are as follows.

(5) Converted storage amount of rainwater infiltration masu and rainwater infiltration pipes

"[Standards] The conversion storage amount of rainwater infiltration masu and rainwater infiltration pipes in 2 (8) shall be calculated as the sum of the standard infiltration amount (calculated by the formula below) and the amount of voids in accordance with the installation standard.

Qf=ko×Kf×1hr×C1×C2

  • Qf: Standard penetration of installation facilities (m3/individual)
  • ko: Soil saturated permeable coefficient (m / hr) (For the time being, it can be 0.05m / hr in calculating.)
  • Kf: Permeable penetration of installation facilities (m2)
  • C1: Impact factor (underground water level) 0.9
  • C2: Impact coefficient (clozed) 0.9

Use the following results for the conversion storage amount of rainwater infiltration masu and rainwater infiltration pipes calculated by the above formula as ko = 0.05m / hr.

In addition, please see the following for the full text as for "guide of the regulations about adjustment of Yokohama-shi development business".

(Inquiries regarding development consultation: 045-671-2898)

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Inquiries to this page

Sewer River Bureau River Department River Management Division Consultation and Guidance

Telephone: 045-671-2898

Telephone: 045-671-2898

Fax: 045-664-5873

Email address: gk-ike@city.yokohama.lg.jp

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Page ID: 274-213-495

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