Tuesday, 4 June 2013

MEAN ANNUAL RAINFALL

AREA OF HEAVY RAINFALL
Rainfall between 200- 400 cm  The Arabian Sea branch of south west monsoon cause rainfall all along the  western Ghats and Western coastal regions from June to September. In North East India, the Bay of Bengal branch of monsoonal winds which causes monsoon in the southern hills of Shillong Plateau, Garo, Khasi, Jaintia hills (Meghalaya) and other states.
In These regions Orographic features play an important role because the moisture laden monsoon winds strike against physical barriers the like mountains, to cause heavy rainfall.
AREA OF MODERATE RAINFALL
Rainfall between 100 – 200 cm The average rainfall over North Indian Plain generally remains between 100 to 200 cm. Other areas of moderate rainfall are northeastern parts of Peninsular
India, highlands of Central India, and Tamil Nadu.

Rain fall between 60 – 100 cm occurs in the upper Ganga Valley, eastern parts of Aravallis, eastern Gujarat, internal parts of Andhra Pradesh, Tamil Nadu, Maharashtra and Karnataka.
The intensity of rainfall decreases from east to west and north to south in the Northern Plains.
AREA OF SCANTY RAINFALL
Rain fall between 40 – 60 cm Parts of Punjab, Haryana, northern and western Rajasthan and Kachchh and Kathiawar regions of Gujarat. A narrow strip of land, lying in rain shadow areas of
Peninsular India receives rainfall below 60cm.
The dry regions of Rajasthan, west of the Aravalli hills receives rainfall below 20cm, Northern parts of Gujarat and Jammu and Kashmir are other regions which receive scanty rainfall.

AREAS OF WINTER RAINFALL
(i) The northwestern parts of India-Jammu & Kashmir, Punjab and U.P. plains.
(ii) Tamil Nadu: Rainfall due to North East monsoon.

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