International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991
8: Irrigation and Uses of Water
For Future Generations; Small Reservoir Irrigation Scheme In The Philippines
N. De Guzman
National Irrigation Administration, Philippines
The Philippine Archipelago, a country of 61 million inhabitants lies entirely
within the humid tropics between latitudes 5° and 20°N longitudes 117°
and 127°. Micro climate within the islands are largely influenced by altitude.
(most islands have narrow coastal plains surrounding mountain ranges with height
from 500 - 2,900 m) and the direction of prevailing air stream. the latter influences
seasonal variation in climate, in particular the rainfall distribution pattern.
Annual rainfall is from 1,500 to 4,200 mm. In most lowland areas average rainfall
is generally adequate for a single crop in the rainy (wet)season. However, rainfall
is often not evenly distributed and dry spells frequently necessitate supplementary
water supplies. Unfortunately, the country lies in an area recognized. as having
the greatest frequency of tropical typhoons in the world. Between 1948 and 1988
an average of tropical typhoons were recorded annually mostly in the months of
June to December, with the highest monthly frequencies (more than three) in July,
August and September.
Water resources development in the Philippines for irrigation, power, domestic
water supply, and industrial purposes involves a variety of types, from simple
diversion to huge reservoirs, to shallow wells, to deepwells, and to rainwater
conservation through storage.
This paper presents a case study of rainwater cistern system or rainwater catchment
for irrigation, flood control and soil and water conservation for future generations.
PDF of full document (19pp,
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