In addition, the soil filters out sediments and (some) of the possible pollutants.
Note: if you look closely at the image you see a series of these basins. The road goes slightly uphill towards the bridge across the motorway. This means water is running towards the photographer on the road and in the right-of-way. The velocity and quantity of the run-off is reduced by the series of basins. Each basin then has its own function of allowing the water to infiltrate into the soil.
Click here for more images of erosion and erosion control measures.
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