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📊 Peak Kelani River Flood Levels Over the Last 40 Years

Hanwella → Nagalagam St(Colombo) in major floods:

▫️1989: 11.56m → 2.80m
▫️1992: 8.27m → 1.54m
▫️1999: 9.39m → 2.01m
▫️2005: 9.07m → 1.72m
▫️2008 (Apr): 9.91m → 1.75m
▫️2008 (Jun): 9.51m → 1.80m
▫️2016: ~10.00m → 2.33m

⭕️ 2025 (4pm, 29 Nov): 10.83m 🔺 → 1.95m (Current peak)

⭕️ Roof-high water levels have been reported in areas that never flooded before (Avissawella & Seethawaka), not even during the 1989 flood.

⭕️ If you're even marginally at risk — evacuate or take immediate precautions.

#SriLanka 🇱🇰 #FloodAlert #StaySafe 🙏

29 Nov 2025, 16:50

Sources

  1. Original post on X — Numbers.lk (@numberslka)

Comments10

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  1. Highest in 1989

    11 months ago
  2. Nagalagam Street in Grandpass??

    11 months ago
    1. Arshad Hassim yes

      11 months ago
  3. Shanika Kothalawala

    11 months ago
  4. Pretty strong positive correlation by the looks of it!

    11 months ago
  5. Any new update on this?

    11 months ago
  6. What does the number on right represent ? + 2.80 from previous highest or what? Its not clear

    11 months agoLikes:4
    1. Numbers.lk

      Anushka Maduranga The first number represents the peak water level at Hanwella, and the second number represents what that water level turns into at Nagalagam Street.

      11 months agoLikes:2
    2. Numbers.lk Thanks , It wasnt so clear before

      11 months ago
    3. Numbers.lk nagalagam street mean is that grandpass co 14 area

      11 months ago

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