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The Inter-Relationship Between Irrigation, Drainage and the Environment in the Aral Sea Basin (Paperback, Softcover reprint of the original 1st ed. 1996)
Loot Price: R4,219
Discovery Miles 42 190
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The Inter-Relationship Between Irrigation, Drainage and the Environment in the Aral Sea Basin (Paperback, Softcover reprint of the original 1st ed. 1996)
Series: NATO Science Partnership Subseries: 2, 22
Expected to ship within 10 - 15 working days
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The irrigated area in the Aral Sea basin totals about 7. 5 million
hectare. Part of the water supplied to this area is consumed by the
irrigated crop; the remainder of the supplied water drains to the
groundwater basin, to downstream depressions, or back to the
rivers. During its use, however, this drained part of the water
accumulates salts and chemicals. The disposal of this polluted
water causes a variety of (environmental) problems. If the
percentage consumed water of the total water supply to an irrigated
area (the so-called overall consumed ratio) can be increased, less
water needs to be drained. This alleviates part of the related
(environmental) problems. Further, if the overall consumed ratio
for the above 7. 5 million hectare is improved, less water needs to
be diverted from the rivers. Hence, more water can flow towards the
Aral Sea. As mentioned above, part of the non-consumed irrigation
water drains to the groundwater basin. Commonly, the natural
discharge capacity of this basin is insufficient to handle this
imported water. As a result, the groundwater table rises towards
the land surface causing waterlogging. In (semi-)arid zones this
waterlogging triggers a soil salinity problem resulting to a
significant reduction in crop yields. The artificial increase of
the discharge capacity, and lowering of the groundwater table,
solves the soil salinity problem.
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