{
  "id": 5347082,
  "title": "How cities can use rain gardens to help prevent flooding",
  "url": "https://urgent.news/2026/09/03/how-cities-can-use-rain-gardens-to-help-prevent-flooding",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-03T14:40:05.000Z",
  "source": {
    "name": "Phys.org",
    "slug": "phys-org",
    "url": "https://phys.org/news/2026-09-cities-gardens.html"
  },
  "original_language": "en",
  "account": "In July 2023, Ottawa experienced an intense rainfall event measuring 167 millimeters (6.6 inches) in just five hours, causing widespread basement flooding, especially in the city's west end, including the Crystal Beach neighborhood. Climate projections warn that such heavy rainfall will become more frequent. To mitigate this issue, researchers explored the effectiveness of rain gardens or bioretention cells, shallow areas filled with plants and soil that absorb stormwater runoff. A computer model of Crystal Beach was utilized to simulate the July 1 rainfall, evaluating different rain garden placement scenarios. The findings revealed that while the amount of land covered by rain gardens matters, their positioning is even more crucial. Gardens on private lots reduced flooded area by 27%, while those in municipal right-of-ways reduced it by 76%. When combined, rain gardens decreased the flooded area by 86%, with water levels dropping significantly. Streetside rain gardens performed better, cutting hazardous flooding that could cause injury or vehicle damage by nearly 90%. Beyond coverage, the placement of rain gardens along downhill paths proved more effective due to their alignment with the natural flow of water. Although rain gardens significantly reduced extreme flooding, they did not eliminate it entirely, indicating the need for continued monitoring and maintenance of these green infrastructure solutions.",
  "summary": "Canada's capital, Ottawa, was bombarded with 167 millimeters (6.6 inches) of rain in five hours earlier this summer in what the city called a 1-in-200-year event. Close to 5,800 reports of basement flooding followed, and the worst of it hit the city's west end, including the Crystal Beach neighborhood.",
  "key_points": [
    "Ottawa faced intense rainfall event in July 2023, causing basement flooding",
    "Rain gardens reduced flooded area by 86% when combined with other measures",
    "Streetside rain gardens cut hazardous flooding by nearly 90%"
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}