Flood damage map of Cagayan de Oro City due to Typhoon Sendong (December 2011)

Flood damage map of Cagayan de Oro City (December 2011)

Flood damage map of Cagayan de Oro City (December 2011) prepared by Engr. Dexter Lo of Xavier University. This map was presented to President Noynoy Aquino.

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8 Responses to Flood damage map of Cagayan de Oro City due to Typhoon Sendong (December 2011)

  1. Patrick says:

    Where is the statistics for Bonbon??? We were affected as well.

    • Patrick,

      Please check the website of Manila Observatory:

      http://www.observatory.ph/downloads/3032872ff4565ca5/PreAnalysis_Sendong_2011_R2.pdf

      For Bonbon, the accumulated rainfall in mm (305 mm = 1 feet), which is the height of flood water if it wasn’t absorbed by the soil or drainage, is as follows:

      Dec 15 11 am- Dec 16 2 pm: 20-40 mm
      Dec 16 2-5 pm: less than 10 mm
      Dec 16 5-8 pm: 60-80 mm
      Dec 16 8-11 pm: above 100 mm
      Dec 16 11 pm-Dec 17 2 am: 60-80 mm

      It is difficult to read from the map because the Manila Observatory logo was overlayed. These are only my estimates. Also, if the rain water does not drain out to the river and to the sea, then the rainfall adds up to the flood height:

      Dec 15 11 am- Dec 16 2 pm: 20-40 mm
      Dec 16 2-5 pm: 30-50
      Dec 16 5-8 pm: 90-130 mm
      Dec 16 8-11 pm: above 190-230 mm
      Dec 16 11 pm-Dec 17 2 am: 250-310 mm (about 1 foot height of flood water)

      Another complication is that Bonbon is a lowland near the river. Actually, all rivers streams from the surrounding mountains lead to Bonbon. This means that rainfall in the surrounding mountains gets washed to the direction of Bonbon. So the flood water height shall increase in time if Bonbon cannot drain its own rainfall.

  2. Patrick says:

    “Resource Not Found”
    So this map is not a “flash flood” map then? Because if it was, I would like to report that flood waters in our house rose to waist-deep in just a few minutes. Houses were swept away by the flood waters in zones 1 and 9. In zone 3 water level was up to the neck. Please check this link; http://www.facebook.com/photo.php?fbid=10150449743561717&set=a.162516311716.131194.528431716&type=1&theater Thank you.

  3. Is the Manila Observatory website down? I’ve been trying to get the preanalysis reports 1 and 2 (link for R2 in this page) but as Patrick said, web says “Resource Not Found.” I can’t access teh Manila Observatory website too.

  4. gliceto says:

    Interesting to check Villanena subdivision in Balulang located in lower elevation but was not flooded; as well upper Cagayan river (after Pelaez bridge) towards in the border with Bukidnon. Our investigation revealed it as both torrid, swerving and circumlocating flash and mud flood as characterized by its “forensic” prints and eyewitness accounts in Bubunawan, Tumalaong, Kalawaig and Cagayan rivers. It appear a megatons of deluge were unleashed from the “bull’s eye” of Sendong. This happened 10 kilometers away from downtown CDO and maybe in less than 1 hour period between 9 to 12 PM on December 16. Roaring sounds of high speed ship and jet plane place in search for runway was overheard during the deluge according to local witnesses and survivors. Accordingly 5 to 6 big bangs of buhawi near the confluences of Bubonawan and Tumalaaong with Cagayan river preceeded the deluge. The rest is natural accumulation of water in the aftermath due to high tide and heavy silts in Macajalar.

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