This chapter describes the problems caused by the drainage water from waste tip sites. Drainage water can pollute streams and rivers that are near landfill sites. This drainage water or leachate comes from rainfall or spring water, which penetrates decomposing wastes and then picks up pollutants from the waste. Leachate may constitute organic matter from rotting food and iron from rusting cans or mild steels. It can also contain chloride or toxic metals. The accumulation of iron has a negative effect on streams and rivers because it inhibits photosynthesis of aquatic plants. It can also cause fish death because iron clogs the gills of fish and they cannot extract oxygen from the water.
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