First we have a drainage system which I guess the British had made.
Second we have political parties which allows slum to thrive for grabbing land and creating vote banks.
Third we have the Shiv Sena who is just happy with the name being changed from Bombay to Mumbai. Rest of the time they are busy bashing up couples during valetinies days and cyber cafe owners for allowing access to Orkut site.
Fourth we have the Congress (SONIA) who is happy if Delhi gets cleaned up of all illegal structures and Mumbai remains as Slum.
Fifth we have the BMC who keeps pouring in tax payers money for repairing bad roads that they have created in the first place.
Lastly we have citizens, just like you and me, accepting it and living like worms inspite of being the highest Tax Payers.
If there is any work being done by any goverment agencies, you will realise that it is being done only because the Judiciary has given them an ultimatum.