Big industrial pig farms use the lagoon system to save money.
The waste is collected and stored in a lagoon. After the solids settle out of the liquid manure and bacteria decompose the organic matter, farmers spray the remaining liquid onto fields as fertilizer. The slurry is rich in nitrogen and phosphorous—which works for fertilizer—but that also makes it disastrous when it gets into rivers after a flood.
It's happened before and now flooding caused by hurricane Matthew may result in the breaching of lagoons filled with liquefied swine poo.
This is a serious hazard to aquatic life and human health.
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