During Typhoon Ondoy, September 2009, extreme floods affected part of Camp Atienza due to unrelenting rains and the overflowing of the banks of the Marikina River.
A scientific study of the species found in five locations in the Laguna de Bay tributary system, including the Marikina River, revealed that the specimen of janitor fish previously reported as Hypostomus plecostomus actually belong to the genus Pterygoplichthys, family Loricariidae.
Wawa River (Rizal) or Marikina River, a river in the Rizal province of the Philippines
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On September 26, 2009, at about 6:00 pm PST, the 50-mph "Tropical Storm Ketsana" (called "Ondoy" in the Philippines) hit Metro Manila and dumped one month's rainfall in less than 24 hours, causing the Marikina River system, including the Manggahan Floodway, to burst its banks very rapidly.