Energy and water are central to sustainable development and poverty reduction efforts globally. They affect all aspects of development, whether social, economic, or environmental. Sustainable energy and water are core business in meeting the Millennium Development Goals (MDGs) in most developing countries. The eight goals that comprise the MDGs build on agreements made at United Nations conferences during the 1990s.1 They represent commitments by countries around the World to reduce poverty and hunger, and to tackle ill-health, gender inequality, lack of education, lack of access to clean water and environmental degradation.

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COLLECTOR WELLS
PART 5
GROUND WATER IN SRI LANKA
In Sri Lanka (Fig 6), one estimate places 8% of the
long term average precipitation of 100 million acre feet to
infiltrate into the ground as ground water. Another estimate
places this value at 17.5% or double.
Figure 6: Location of Sri Lanka on the world map.Source:
Wikipedia.Http://en.wikipedia.org/wiki/Sri_Lanka.Public access.
Taking a rounded average of 10%, this places the annual
groundwater recharge at 10 million acre feet or about 12,375
million cubic meters (mcm). However, this does not represent the
total water stored in the ground since it can only be determined
by estimating aquifer volumes and properties. The total volumes
will almost certainly be many times the annual recharge and many
hundred times the total man made storage in Sri Lanka.
The main rainy season in Sri Lanka extends from October
to January during the northeast monsoon season, but it also has
a southwest monsoon season from April to June (Fig 7). Rainfall
is abundant in the south-western coast and mountain slopes, but
the north-eastern part of the country is considerably drier with
little rain falling from February to September.
Figure 7: Rainfall in the Indian Ocean.
In the United States and in many European countries
where groundwater accounts for most of the total water used,
aquifers can be very thick, often exceeding hundreds of feet.
Therefore using deep draw downs does not present any problems
and conventional bore hole or tube well drilling techniques are
used.
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