Chemical water quality - The quality of a waterbody determined using chemical rather than physical or biological parameters and methods. A sewer system that conveys stormwater runoff along with sanitary sewage and industrial waste. A legal injunction mandating a party to perform an action. Constructed stormwater wetland - A water quality BMP, design to have similar characteristics and functions to a natural wetland, with the specific purpose of treating stormwater runoff through uptake, retention, and settling. Detention - The storage and slow release of stormwater following a precipitation event by means of an excavated pond, enclosed depression, or tank.
Detention is used for both pollutant removal, stormwater storage, and peak flow reduction.
Both wet and dry detention methods can be applied. These waters support a rich and diverse ecology. This process can increase the growth potential for algae and aquatic plants. Excessive eutrophication can leave waterbodies devoid of most life, impede navigation, and result in aesthetic nuisances. A method for characterizing pollutant concentrations in a receiving water from a runoff event often chosen for its practicality.