See non-point source. See also artificial recharge, incidental recharge, natural recharge. Dominant vegetation often consists of phreatophytes. Secondary treatment Also known as biological treatment, further reduces the amount of solids by helping bacteria and other microorganisms consume the organic material in the sewage. Oxygen is critical to this treatment stage.
Air activated sludge and biological filters are two of many methods of secondary treatment.
The discharge that occurs in a natural channel. A more general term than runoff, streamflow may be applied to discharge whether or not it is affected by diversion or regulation. SEPA State Environmental Policy Act, the name of an Act , in Washington, which is designed to protect the natural resources of the state. SEPA checklists are completed by an applicant and reviewed by a lead agency. TMDL Total Maximum Daily Load.