25-year 24-Hour Rainfall Event

{
  "id": "MLC-T-ENV-000040",
  "term": "25-year 24-Hour Rainfall Event",
  "field": "Environment",
  "definition": "1. Maximum precipitation event with a probable recurrence interval of once in 25 years as defined by the National Weather Service in technical paper no. 40, “Rainfall Frequency Atlas of the United States,” May, 1961, and subsequent amendments or equivalent regional or State rainfall probability information developed therefrom.\n\n2. Maximum 24-hour precipitation event with a probable recurrence interval of once in 25 years as defined by the National Weather Service in technical paper No. 40, “Rainfall Frequency Atlas of the United States”, May 1961, and subsequent amendments in effect, as of the effective date of this regulation.\n\n3. Precipitation events with a probable recurrence interval of once in ten years, or twenty five years, or one hundred years, respectively, as defined by the National Weather Service in Technical Paper No. 40, “Rainfall Frequency Atlas of the United States,” May, 1961, or equivalent regional or State rainfall probability information developed from this source.",
  "subject": "Natural environments",
  "references": [
    "40 CFR 422.41 (CFR 2013); 40 CFR 422.51 (CFR 2013)",
    "40 CFR 418.11 (CFR 2017)",
    "40 CFR 412.2 (CFR 2017)"
  ],
  "url": "https://mlchart.com/terminology/environment/25-year-24-hour-rainfall-event/"
}