Flood Incident Report – Municipality of Imelda, Zamboanga Sibugay

By Ollyn Rey Balignot

On March 31, 2021, the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) stated in its Wednesday afternoon weather update that the Low-Pressure Area (LPA) was last seen one hundred thirty-five kilometers (135 km) east of General Santos City which brought scattered rains in the Zamboanga Peninsula.

Photos 1a and 1b. Actual rescue of the residents that were trapped in their respective houses during the flooding incident last April 1 to 2, 2021. Photos was adopted from the Facebook post of Mr. Michael Magallanes Oral, Personal Assistant of Mayor Silva.
Photo 2. Overflowing of Sibuguey River was documented along the National Highway in Barangay San Jose, Municipality of Imelda, Zamboanga Sibugay. Photo was adopted from the Facebook post of Mr. Michael Magallanes Oral, Personal Assistant of Mayor Silva.

In this regard, heavy rainfall was reported on the neighboring municipalities of Imelda, Zamboanga Sibugay specifically on the Municipalities of Diplahan, Zamboanga Sibugay and Bayog, Zamboanga del Sur, where the headwaters of the Sibuguey River emanate. Due to the heavy rainfall on the neighboring municipalities, the Sibuguey River overflowed in the low-lying areas of the Municipality of Imelda, particularly along the floodplains in Barangays Balugo, Gandiangan, La Victoria, Lumpanac, Lumbog, San Jose, and Sta. Barbara. Based on the phone-patched interview with Mr. Michael Magallanes Oral and Ms. Mercy Delos Santos, both from the LGU-Imelda, flooding of the aforementioned barangays started at approximately 10:00 am on April 1, 2021, and lasted for about twenty-eight hours (28 hrs), and subsided at around 12nn of April 2, 2021. Also, it was reflected on the Geohazard Matrix last October 2011, during the conduct of 1:10,000 scale Geohazard Assessment in the Municipality of Imelda that the abovementioned barangays are within the Moderate to High Flood Susceptibility.

Figure 1. Portion of the 1:10,000 scale Landslide and Flood Hazard Map of Imelda Municipality, Zamboanga Sibugay showing the location of the Barangays affected by the April 1 – 2, 2021 flooding.

1:10,000 scale Geohazard Matrix (October 2011)

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