International Conference on Rain Water Cistern Systems
USA - June 1982
2: Rainfall Analysis
Estimation of Extreme
Point Rainfall Over Peninsular India
P.R. Rakhecha and A.K. Kularni,
Indian Institute of Tropical Meteorology
In November 1980, the United Nations launched International Drinking Water
and Sanitation Decade (1981-1990) to focus world-wide attention on providing safe
drinking water. In India there are still villages and towns in various parts of
the country where people have to carry water from long distances for their daily
use in spite of the fact that we have tremendous water resources which are replenished
year after year by rainfall during the monsoon months.
It has been estimated that the average annual rainfall of the contiguous Indian
area is about 117 cm of which about 76% is received during the four monsoon months
of June to September (Dhar, Rakhecha, and Kulkarni 1979). This much rainfall is
estimated to generate annually a surface flow on the order of 1 881 bil m3 (Murthy
1977). Apart from this, this country has groundwater resources which are on the
order of 350 mil m3.
Because the main goal of the International Drinking Water and Sanitation Decade
is to provide safe drinking water in sufficient quantity, an attempt has been
made in this study to find out what the maximum probable rainfall or the extreme
rainfall is that a station can get in the peninsular region of this country. This
information, would not only be useful in knowing the extreme amount of rainfall
that is physically possible over a station or a basin, but is also useful for
the safe design of hydraulic structures that may be constructed for conservation
of water in this region of India.
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