Brahamaputra Basin
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<strong>Brahamaputra</strong> <strong>Basin</strong><br />
Figure 2. Monthly average temperature (1969-2004)<br />
1.3.3 Trends and variability<br />
Trends have been generated based on area weighted average and regression analysis techniques.<br />
Figure 2 shows the variability of annual average rainfall of Brahmaputra basin over the last 34 years<br />
(1971-2004). The general rainfall trend in the basin shows that rainfall pattern in the basin<br />
decreasing. But the changing trend is not drastic. In 1974, the Brahmaputra upper sub basin<br />
experiences maximum 4947.54 mm rainfall which is followed by 4051.94 mm rainfall in 1985. The<br />
Brahmaputra upper sub basin accounts least rainfall of 1776.57 mm in the year 1989. The maximum<br />
fall in the temperature observed in the Brahmaputra lower sub basin with 1720.65 mm in the year<br />
1992.<br />
Figure 3. Trend of annual average rainfall (1971-2004)<br />
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