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Plants will grow naturally on fertile
soil that is watered by rain. However, in regions of the world
where the climate is very dry for some seasons, the soil becomes
so dry that it restricts the growth of vegetation. This problem
can be overcome by irrigation, a man-made system for watering
the land.
Irrigation water can be stored in
reservoirs
during the rainy season, then in the drier seasons it can
be released from the reservoir and distributed over the land
through a system of canals. Usually, the water flows under
the influence of gravity to the areas requiring it, or the
water can be pumped out of the canals onto the land.
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