What is MENISCUS? The departure from a flat surface where a liquid meets a solid, due to surface tension. The effect can be seen clearly through the wall of a glass tube. The surface of water in air rises up the wall of the tube, while that of mercury is depressed, SIGHT-FEED LUBRICATOR.
An abandoned mud-covered scooter is found during the draining of the Canal Saint-Martin in Paris, France Charles Platiau/Reuters
A French drain is simply a small trench, dug to a gradient, and filled with aggregate, that will allow surface water to drain away from your walls, a building, driveway, garden or area that is prone to surface water pooling, or is vulnerable to flash flooding.