1 Having a landscaper or other professional install outdoor French drains can cost $10-$30 a linear foot but averages about $25 /foot depending on depth and width (typically 12-24 deep and 6-18 wide), and local rates.2  A French drain 30'-50' long might cost $300-$1,500, with prices averaging about $750-$1,250. A French drain 30'-50' long might cost $300-$1,500, with prices averaging about $750-$1,250.
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Impact attenuator. A Truck-Mounted Attenuator (TMA) in Auckland. An impact attenuator, also known as a Truck Mounted Attenuator (TMA), crash cushion, crash attenuator, or cowboy cushion, is a device intended to reduce the damage to structures, vehicles, and motorists resulting from a motor vehicle collision. Impact attenuators are designed to absorb the colliding vehicle's kinetic energy.