Road ecology blog: Basin for runoff from road

July 23, 2015  •  Leave a Comment

Road ecology blog: Basin for runoff from road, SP-225 motorway, São Paulo, Brazil.

This is a better alternative than dumping runoff from highways directly into streams or rivers. The basins force the water to into the soil. While the water may still get to streams or rivers it doesn't get there all at once and it doesn't get there during the actual precipitation events. This evens out the flow in streams and rivers. It minimizes "peak flows" and the potential for associated flooding downstream. 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.

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Basin to reduce the velocity and quantity of water and allow infiltration and associated removal of sediments in the soil rather than a stream, along SP-225 motorway, São Paulo, BrazilBasin to reduce the velocity and quantity of water and allow infiltration and associated removal of sediments in the soil rather than a stream, along SP-225 motorway, São Paulo, BrazilBasin to reduce the velocity and quantity of water and allow infiltration and associated removal of sediments in the soil rather than a stream, along SP-225 motorway, São Paulo, Brazil

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