Between September 28 and October 3,parts of north Karnataka received six times more than its normal rainfall of 35 mm for the period,according to weather reports quoted by the Karnataka government in a preliminary assessment of the flood damage in the state. The north interior parts of Karnataka received 251 mm of rainfall during the period; this coupled with overflowing rivers and reservoirs resulted in massive flooding.
In three of the 14 worst affected districts of Bijapur,Bagalkot and Raichur,the rainfall during the fateful week was over eight times more than normal. Some parts of the three districts received their heaviest recorded single day rainfall in 100 years. The rainfall during the week ending on October 4,2009 was the highest since 1970 as recorded at Bagalkot,Bijapur,Raichur,Koppal,Bellary,Gadag,Belgaum,Gulbarga,Dharwad,Uttara Kannada and Udupi, according to the weather reports.
The other region affected by the heavy rainfall,triggered by a low-pressure weather system in the Bay of Bengal,was coastal Karnataka where 232 mm of rainfall was received against the normal of 54 mm.
During the same period the southern parts of the state received rainfall in tune with the normal pattern of 37 mm.
Nearly 63 per cent of the geographical area in the state,with a population of about 17.8 million,were affected by floods and heavy rainfall incidences, states a preliminary assessment of the floods. The number of deaths as a consequence of the floods has been put at 197.