Arid Land Irrigation in Developing Countries. Environmental by Barton E. Worthington

By Barton E. Worthington

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Extra resources for Arid Land Irrigation in Developing Countries. Environmental Problems and Effects

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And in water (fisheries and aquacultures), irrigation promotes radical changes in human population. These com­ prise settlement of nomadic indigenous population, re-location of farming population from other territory, and other social interactions. Aquatic management opportunities Biological changes may have potential benefits. Possible benefits are protein production through fish, crayfish and waterfowl, and the utilization of aquatic vegetation for water purification. Promotion of protein production in water bodies and flooded fields of irrigated systems involves new practices.

An additional advantage of sedimentation in relatively shallow storage reservoirs is the increase in food matter for bottom feeders. In the Volta Lake the enormous amounts of organic sediment and decaying vegetable matter contributed to a major increase of fish, especially of the Tilapia and Labeo species, during the early life of the dam; great quantities were caught in the shallower Afram region. Fisheries in smaller farm ponds react similarly, especially when stocked. The size and volume of a reservoir to a large extent determine its physical and chemical character.

Aquatic organisms are most affected, namely, algae, vascular hydrophytes, aquatic invertebrates, insects with an aquatic stage in their life cycle, and fish. ) and in water (fisheries and aquacultures), irrigation promotes radical changes in human population. These com­ prise settlement of nomadic indigenous population, re-location of farming population from other territory, and other social interactions. Aquatic management opportunities Biological changes may have potential benefits. Possible benefits are protein production through fish, crayfish and waterfowl, and the utilization of aquatic vegetation for water purification.

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