text:  Annually , Manila is hit with 6 to 7 typhoons creating floods . In 2009 , Typhoon Ketsana struck Philippines . In the aftermath of Typhoon Ketsana , the lack of infrastructure led to one of the worst floodings in the Philippines and creating a significant amount of pollution . Following the aftermath of Typhoon Ketsana , the city began to dredge its rivers and improve its drainage network . The Pasig River Rehabilitation Commission is in charge of cleaning up the Pasig River and tributaries for transportation , recreation and tourism purposes . Rehabilitation efforts have resulted in the creation of parks along the riverside , along with stricter pollution controls . 
  