[5][6]: 61  Ever since the onslaught of 2009's Typhoon Ketsana (Ondoy), and consistently-reoccurring flooding in the metropolis, the Paranaque Spillway project is now being revived,[7] together with the proposed Marikina Dam.

Department of Public Works and Highways (DPWH) Secretary Mark Villar is proposing to build 2 bridges connecting the east and west bank sides along the floodway.

[1] An unusual large flood occurred in October/November 1986, lasting for 2 months and resulting in high mortality and morbidity rates due to gastroenteritis and other water-borne diseases.

[12] 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.

It is thought that blocked pipes and a poorly maintained sewer system, along with uncollected domestic waste, were major contributory factors in the speed with which the flood waters were able to engulf the surrounding area.

[13] Consequently, in February 2010, President Gloria Macapagal Arroyo revoked Proclamation 160 that reserved 20 parcels of land along the floodway for 6700 urban poor families, and ordered the forcible relocation of the illegal settlers whose houses were blocking the waterway to Laguna de Bay.