Urban stream

[4] Toxicants, ionic concentrations, available nutrients, temperature (and light), and dissolved oxygen are key stressors to urban streams.

USS also considers hydrogeomorphology changes which are characterized by a deeper, wider catchment, reduced living space for biota, and altered sediment transport rates.

Keep in mind the status of water quality is difficult to assess in urban areas because of the complexity of the pollutions sources.

Consistent decrease to ecological health of streams can be from many things, but most can be directly or indirectly attributed to human infrastructure and action.

[2][11] Urban streams also suffer from chemical alterations due to pollutants and waste being uncleanly dumped back into rivers and lakes.

High levels of salinity would be disastrous for any native freshwater marine life and pollutants like mercury are dangerous to most organisms.

Second River , an urban stream in Orange, New Jersey
Some urban streams, such as the Hobart Rivulet in Tasmania , run underground for substantial distances