On October 22, 2012, Hurricane Sandy hit New York City. Lack of preparation for the storm resulted in the destruction of homes and buildings. Most of this damage was induced by the ground's scant amount of permeability.
Permeability is the rate at which liquids and gasses can pass through a certain substance.
During the hurricane, water rushed throughout the city. Within a matter of hours, New York City was under water. This was due to the absence of permeable ground. Most of the city is composed of concrete and asphalt streets; in other words, impermeable materials. If the city contained more parks and forest land, the soil would soak up more water; thus, decreasing chances of a flood.
For example, Whole Foods has permeable parking lots. Gravel lies beneath the rows of bricks in the parking lot. This gravel aids to filter out large particles and pollutants as the rainwater douses it. After the water passes through the permeable gravel, it seeps through into the rich soil, and down into the groundwater. This helps to diminish the possibility of engulfing an area with excess amounts of water.