•Pervious:
Surfaces which allow the penetration
of water into the ground.
•Impervious:
Any covering which prevents stormwater from entering the ground; a building, parking lot, driveway, patio, pool.
•Stormwater Runoff:
Water flowing over the land during and immediately following a rainstorm. Stormwater carries nutrient laden sediment, heavy metals, oils, and other materials which have accumulated on the land between rain events into streams, rivers, and lakes.
•Watershed
–a region or area bounded
peripherally by a divide and draining ultimately
to a particular watercourse or body of water
•Infiltration (Retention)Practices: Retain
storm-water on site, allowing it to infiltrate into the
ground or to evaporate. These are most effective at reducing pollution since the first flush is not discharged to surface waters.
