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Dams and disease : ecological design and health impacts of by William Jobin

By William Jobin

A consultant to aid planners and engineers to the improvment of destiny water tasks. The earlier century of world adventure on water initiatives is gifted because the foundation for growing new techniques. First-hand analyses, together with 35 case stories from 25 international locations, painting the impact of politicians, biologists, engineers, computing device types and physicians at the astonishing successes and screw ups of the developers of canals and dams. by way of drawing in this event, the writer outlines equipment for assessing, predicting and combating significant water-associated ailments round huge dams, canals and irrigation platforms.

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Extra resources for Dams and disease : ecological design and health impacts of large dams, canals, and irrigation systems

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Many of the principles described in this chapter are derived from that research, coming out of the environmental movement. Prior to the 1970s, research on population dynamics of bilharzia snails had been limited to simple observations on the numbers of snails in natural populations over a year’s time, with a few observations on the habitat. The newer understanding includes the effects of weather, nutrients, predators and other ecological parameters. The tenacity and prolific nature of the small, fragile-shelled bilharzia snails makes them a very difficult animal to eradicate from even the smallest of habitats.

In some countries both the irrigation authority and private farmers utilize shallow wells to extract sweet water from the upper levels of the aquifer, thus avoiding a mistake made in other places where attempts to lower the groundwater level utilize deep tubewells. The deep wells bring up saline water and mix it with sweet surface waters, permanently impairing their use in irrigation. A second example occurs in many countries when sewers and sewage treatment systems are developed: the combining of industrial and domestic wastewaters with storm waters.

A study was begun Predicting health impacts in the Tropics 39 in 1970 in Kano State of northern Nigeria, which resulted in the development of such a model (Molineaux and Gramiccia, 1980). It was based on detailed biological and medical data from two small villages and has since been tested and improved in a number of different places in Africa. The computer predictions of the seasonal variations in the capacity of the two important malaria mosquitoes, Anopheles gambiae and Anopheles funestus, gave reasonable agreement with the observed figures for the two villages investigated.

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