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8<br />
TABLE - II<br />
Division<br />
*Large<br />
excess<br />
Mod.<br />
excess<br />
Slight<br />
excess <strong>No</strong>rmal<br />
Slight<br />
defect<br />
Mod.<br />
defect<br />
Large<br />
defect<br />
Coastal Andhra<br />
Pradesh 11 16 V9 1.1 15 7 8<br />
Malabar 2 16 14 2.0 14 9 2<br />
Tamil Nadu 5 18 1.0 15 12 12 5<br />
Rayalaseema 11 10 11 12 9 11 13<br />
Total <strong>No</strong>. of occasions 77<br />
* Large excess Percentage departure + 51 and above<br />
Moderate excess + 26 to + 50<br />
Slight excess + 11 to + 25<br />
<strong>No</strong>rmal + 10 to - 10<br />
Slight defect - 11 to - 25<br />
Moderate defect - 26 to - 50<br />
Large defect<br />
- 51 and above<br />
(From 'Rainfall in Madras State with special reference to Tamil Nadu and<br />
Rayalaseema - by P.R. Krishna Rao, I.Met.D. Memoirs Vol. XXX Part I).<br />
3.9 It is seen from the Table that the rainfall is nearly normal (slight<br />
excess to slight defect) in nearly two-thirds of the years in Kerala and in<br />
half the number of years in the other divisions. Moderate to large deficient<br />
rainfall years are high in Rayalaseema (33%) and Tamil Nadu {25%). On the basis<br />
of 81 years-data, it was found that even in the worst famine years, the rainfall<br />
in any district of Tamil Nadu, does not go below 1/7 of the normal and<br />
even in the worst flood years, the rainfall does not exceed times the normal<br />
in any district. In Tamil Nadu as a whole, the extreme abnormalities have been<br />
from -61% to +83%.<br />
4. Heavy Rainfall<br />
4.1 Heavy to very heavy falls occur in Tamil Nadu and Coastal Andhra Pradesh<br />
during the northeast monsoon season. They also occur in the Kerala, though<br />
their frequency may be less. In South Interior Mysore and Rayalaseema, they are
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