The California Ocean Plan, adopted by the State Water Resources Control Board, prohibits waste discharges into the ASBS. One way waste is discharged to the ASBS is through pipes that drain directly to the ASBS; another way is through dry-weather runoff (runoff not from precipitation) that flows over the land and eventually drains to the ocean. Runoff, no matter where it starts, may pick up pollutants as it flows over impervious surfaces. That polluted water eventually drains to the ocean through storm drains or natural streams and creeks. This runoff may harm the fragile biological and marine communities, which is why the State prohibits "waste" discharges into the ASBS and why best management practices (BMPs) must be used to prevent such discharges.