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
When it rains, water accumulates in yards because the soil is incapable of absorbing the water. There are primarily two ways that yards can be drained of excess water. One way is using what is called a French Drain. A French Drain is defined by Wikipedia as the following: A French drain is a trench covered with gravel rock containing a perforated pipe that redirects surface water and ground water away from an area. A French drain can have perforated hollow pipes along the bottom (see images) to quickly vent water that seeps down through the upper gravel or rock.