Rainfall intensity ‘unusual’, expect more disruption

Karnataka State Natural Disaster Monitoring Centre

Bangalore, 21 September: The intensity of rainfall in the city during this monsoon has been unusual say people in the Karnataka State Natural Disaster Monitoring Centre (KSNDMC). “Cumulative rainfall of past 15 days in Bangalore city is 262 mm; whereas the regular monthly rainfall of September is 176 mm.” Subha Abinash, in-charge of hydrology section at KSNDMC said.  

South Bangalore is the most affected region in the entire city, she said, adding Bomanahalliand Kengeri exemplify the conditions of the affected areas. “Kengeri received 450 mm of rainfall in last 10 days, whereas the historical records of monthly rainfall in September is 516 mm as recorded in 1986. Given more amount of heavy rainfall in the coming week, the 1986 records might be broken.” she said.

The extensive flooding reported at Koramangala and other areas in Bangalore can be traced back to the unusual change in the intensity of rainfall she said.

She attributes the change in rainfall to microclimatic zones that are formed. Urbanization, she said, was a major cause, as most water-bodies in the city have been concretized and converted into layouts.

The KSNDMC uses a dense network of rain-gauges to track rainfall.

Production of crops in the vicinity of Bangalore has not been affected. Lakshmamma, whose family owns agricultural farms in the village of Golahalli, said that most lands have a canal system to drain excess water, and this has saved the crops.

It is the city that suffers the disruption due to rainfall. Urban planner PankajYadav stated that the effects of urbanization are evident from the climate change. “It is just that you don’t design your city well, that is why it is flooding. Heavy rainfall is a hazard, but poor planning leads to disaster.”

KSNDMC forecasted heavy rainfall on 18th September 2017, following the normal rainfall – starting from 17th. There is no probability of heavy rains in the next 4 days, but Monday might see a change in that. KSNDMC also warns that heavy rains later will lead to more flooding in the city.  

Other IIJNM Publications