40 CFR 257.3-1 - Floodplains.

§ 257.3-1 Floodplains.
(a) Facilities or practices in floodplains shall not restrict the flow of the base flood, reduce the temporary water storage capacity of the floodplain, or result in washout of solid waste, so as to pose a hazard to human life, wildlife, or land or water resources.
(b) As used in this section:
(1) Based flood means a flood that has a 1 percent or greater chance of recurring in any year or a flood of a magnitude equalled or exceeded once in 100 years on the average over a significantly long period.
(2) Floodplain means the lowland and relatively flat areas adjoining inland and coastal waters, including flood-prone areas of offshore islands, which are inundated by the base flood.
(3) Washout means the carrying away of solid waste by waters of the base flood.
[44 FR 53460, Sept. 13, 1979; 44 FR 54708, Sept. 21, 1979]
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§ 257.3-1 Floodplains.

(a) Facilities or practices in floodplains shall not restrict the flow of the base flood, reduce the temporary water storage capacity of the floodplain, or result in washout of solid waste, so as to pose a hazard to human life, wildlife, or land or water resources.

(b) As used in this section:

(1) Based flood means a flood that has a 1 percent or greater chance of recurring in any year or a flood of a magnitude equalled or exceeded once in 100 years on the average over a significantly long period.

(2) Floodplain means the lowland and relatively flat areas adjoining inland and coastal waters, including flood-prone areas of offshore islands, which are inundated by the base flood.

(3) Washout means the carrying away of solid waste by waters of the base flood.

[44 FR 53460, Sept. 13, 1979; 44 FR 54708, Sept. 21, 1979]

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United States Code

Title 40 published on 2015-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR Part 257 after this date.

  • 2015-07-02; vol. 80 # 127 - Thursday, July 2, 2015
    1. 80 FR 37988 - Technical Amendments to the Hazardous and Solid Waste Management System; Disposal of Coal Combustion Residuals From Electric Utilities—Correction of the Effective Date
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      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on October 19, 2015. Effective July 2, 2015, the effective date of the final CCR rule published on April 17, 2015 at 80 FR 21302 is corrected from October 14, 2015 to October 19, 2015.
      40 CFR Part 257