MODERN
IRRIGATION-SYSTEM PLANNING AND CONSTRUCTION:
The first
consideration in planning an irrigation project is developing a water supply.
Water supplies may be classified as surface or subsurface. Though both surface
and subsurface water come from precipitation such as rain or snow, it is far
more difficult to determine the origin of subsurface water. In planning a
surface water supply, extensive studies must be made of the flow in the stream
or river that will be used. If the streamflow has been measured regularly over
a long period, including times of drought and flood, the studies are greatly
simplified. From streamflow data, determinations can be made of the minimum,
maximum, average daily, and average monthly flows; the size of dams, spillways,
and downstream channel; and the seasonal and carry-over storage needed. If
adequate streamflow data are not available, the streamflow may be estimated
from rain and snow data, or from flow data from nearby streams that have
similar climatic and physiographic conditions.
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| Sprinkled Irrigation |
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| Sprinkled Irrigation |
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| Dujiangyan Irrigation System |
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| Drip Method |
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