Extended Rain in Chennai

Chennai is witnessing extended rain due to low pressure. I can understand how people in mumbai, new orleans,mexico would have suffered due to heavy rains. Even though amount of rain is compartively small compared to mumbai and other places, chennai is flooded everywhere. My place is still worse. I was thinking whether storm water drainage is there in the first place. Managing kid in this kind of weather is very diffcult as there is water every where and can't go out.