Multi-functional culvert, SP-270 about 70 km south east of Presidente Prudente, São Paulo, Brazil. Note that the run-off from the road (including sediments and pollutants) is directed into the stream.
It is far better to have runoff infiltrate into the soil as this:
1. Reduces peak flows and flooding downstream.
2. Filters out most of the pollutants and sediments so that they do not end up in the stream.
Click here for more images of erosion and erosion control measures.
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Multi-functional culvert, SP-270 about 70 km south east of Presidente Prudente, São Paulo, BrazilMulti-functional culvert, SP-270 about 70 km south east of Presidente Prudente, São Paulo, Brazil