The Why and How of Drains and Sewers
In parts of the world without adequate drainage systems, sewage often ends up contaminating water supplies used for drinking or bathing. As well as just being plain unpleasant, this exposes people living in such area to things like cholera, typhoid, dysentery, schistosomiasis, hepatitis A, intestinal nematode infections and other awful diseases. Drainage and sewerage are […]
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