Why Mumbai faces extreme waterlogging in monsoon?

Mumbai has been witnessing incessant rains amid monsoon arrival. With the monsoon onset, civic issues are again back as it is a perennial issue of Maharashtra. During monsoon, waterlogging, traffic congestion, blocked drainage have become so common that Mumbaikars have become habitual of it. Mumbai comes under the list of state which pays highest tax then why this perennial issues never stops. Watch this video to know.