Stowe argues that tile drainage systems used by the upstream farms to reduce crop flooding should be identified as "point sources" of pollution under the federal Clean Water Act, from which they traditionally have been exempt.
Therefore, it can be summarized that the control of point sources as well as non-point sources of pollution are vital to clean the river.
Recognizing the environmental health threat of impervious surfaces as well as other point sources of pollution, the EPA established a stormwater permitting program under the National Pollutant Discharge Elimination System.
In addition, there may have been other pollution sources, as a single point source of pollution would not explain the observed increase in background Hg levels after the mid-Nara era.
The pollutants generated during the manufacturing process are easier to handle, as an industry is a point source of pollution and it is possible to install pollutant-specific treatment facilities.
The threats that climate change pose to coral reefs may be magnified by elevated levels of nutrients, sediments and pollutants from terrestrial runoff, or from point sources of pollution such as ship-groundings and mine tailings [3].
This is largely due to diffuse and point sources of pollution such as wastewater treatment plants (WWTPs), which discharge poorly treated wastewater via rivers to the sea.
Moreover, it is important to tackle the pollution arising due to non-point sources of pollution such as from the agricultural fields, direct human and animal bathing in the river, immersion of idols, etc.
Nevertheless, EPS act as sink for Hg II) from point source of pollution, displaying variety of sorption/incorporation sites that influence the transport and fate of Hg in aquatic environment.
Several studies have been performed around point sources of pollution, such as industrial plants, using circular areas at different distances from the source to define exposure zones (e.g., Aylin et al. 2001; Wilkinson et al. 1997).
