What caused the flood in Cainta, Pasig and Ortigas Ave Extension?

It is more fun criticizing

          The channel could be only 5 meters wide, the rest of the river about 10 meters are occupied by settlers

I tried to find out whether the hypothesis that the creeks and rivers were responsible for the Ortigas Ave extension.  Surely, there will be people whose houses will be damaged, there will be electrocution, aids and rescue operations.   But the root causes will not be investigated nor removed.  They are there, we ignore, we deny that they exist, and that some of our country men due to their selfish acts caused this:

                 They will be always the victim; why cant we move them?  Why are they untouchables?  Cant the govt relocate them to a much safer place?

                  Other river bank settlers at the Brookside (Ortigas area)