Impervious surfaces disrupt natural hydrology from occurring
Impervious surfaces are any surface that prevents water from being absorbed into the ground. These areas include pavements, rooftops, decks, and compacted soils. As natural areas are replaced with these hardened surfaces, water runoff volumes are increased. Soil, forests, and wetlands (pervious surfaces) act as sponges and soak up the rain. Through this natural system, the water is infiltrated into the soil and then released slowly into the streams, rivers, and bays through groundwater. With absorption occurring in the ground and being released into streams; flooding, erosion, and droughts are minimized, as well as nutrient and chemical pollution.