German engineers have developed a water-absorbent asphalt, often referred to as permeable or porous asphalt, designed to address stormwater management and reduce flooding.
This innovative road surface can absorb significant amounts of rainwater (up to 4 tons per minute, according to some claims) allowing water to drain directly into the ground or underlying drainage systems.
The asphalt uses a porous structure, typically made with a no-fines concrete or granite-based mixture, which enables water to pass through while filtering out pollutants like motor oil.
This technology, sometimes called “Flüsterasphalt” (whisper asphalt) in Germany due to its noise-reducing properties, is being tested in various regions. It offers environmental benefits like replenishing groundwater, reducing strain on sewer systems, and enhancing road durability by minimizing puddles and surface damage.
However, it can be more expensive than traditional asphalt, with costs estimated at $3-$8 per square foot and requires maintenance to prevent clogging.
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