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12 July 2026

Impact of dams on river temperature

While the study focuses on U.S. dams, the findings provide valuable scientific context regarding the environmental impact of large-scale irrigation and infrastructure projects, which is a recurring theme in GS3 environmental and agricultural syllabus topics.

1 min read 1 questions 1 prelims

Notes

  • Satellite data from 2013-2024 indicates 71% of 287 large dams in the U.S. significantly alter downstream water temperatures.
  • The primary impact observed is an increase in water temperature downstream of dams.
  • Temperature changes persist for at least 20 km downstream from the dam site.
  • Dams with reservoirs are associated with the most extreme temperature shifts.
  • Altered river temperatures pose risks to aquatic ecosystems, specifically disrupting fish spawning cycles.
  • Negative ecological impacts are most pronounced during the spring and summer seasons.

Questions

  1. Analyze the ecological implications of large-scale dam infrastructure on riverine thermal regimes and their subsequent impact on aquatic biodiversity. 150 words
    Attempt this — 150 words in 8 min
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Prelims

  1. Based on recent satellite data studies regarding the impact of large dams on river health, which of the following statements is correct?

Syllabus

Topics

Sources

250words.in · https://250words.in/daily/2026-07-12/impact-of-dams-on-river-temperature