The BBMP and Karnataka State Natural Disaster Monitoring Centre (KSNDMC) officials has said the recent floods in Bengaluru are happening in smaller and newer areas, not like earlier times. The previous years most parts of Bengaluru would get flooded in one go and the water level would gop down, but now new areas are experiencing flooding and get cut off from the city. They said, a worrying fact is each year, new areas are being added to the list of flood-hit places.  

Karnataka CM alerts BBMP officials on heavy rain forecast by IMD

This means Bengaluru is expanding in a fast phase. BBMP Administrator Gaurav Gupta said last year it was Bhadrappa layout and this year it is Dattatreya Layout worst hit by the flood. Areas that are getting flooded are unplanned revenue layouts. Another senior BBMP official said it has been observed that the homes in these areas are lower than the level of stormwater drains, which is leading to havoc when it rains. 
The areas are highly concreted, leading to poor absorption of rainwater into the ground. The water drains are unable to hold large quantities of water as their inner layers are concreted and is made for a small household water usage.

CM Yeddyurappa announces compensation to flood victim

The rain lashed for over five hours, from 1.30 pm to 7 pm, on friday October 23 many localities in Rajarajeshwari Nagar were flooded up to 3 feet high. But in few other areas people complain BBMP of not deploying the underground drainage system properly. In the situation of pandemic, water stagnation is making people havoc. 

Karnataka CM Yediurappa conducts aerial survey of flood affected areas