Water Pollution
Published on Nov 18, 2015
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PRESENTATION OUTLINE
URBAN AREA
WATER POLLUTION CAUSES
-Runoff from streets carries trash, oil, rubber, heavy metals, and other contaminants from automobiles.
Photo by Wonderlane
URBAN AREAS
Untreated or poorly treated sewage can be low in dissolved oxygen and high in pollutants such as fecal bacteria, chemicals, and other bacteria that drains Into bodies of water and contaminates them.
Photo by Wessex Archaeology
URBAN AREAS
Groundwater and surface water can be contaminated from many sources such as garbage dumps, toxic waste and chemical storage and use areas, leaking fuel storage tanks, and intentional dumping of hazardous substances.
Photo by derpunk
URBAN AREAS
Air pollution can lead to acid rain, nitrate deposition, and ammonium deposition, which can change the water chemistry of lakes.
Photo by jenspie3
RURAL AREAS
WATER POLLUTION CAUSES
-Runoff from agricultural land, containing substances including pest control products, animal medicines, slurry, sewage sludge and manure pollute the water in rural areas
Photo by unclespike
RURAL AREAS
Groundwater drainage discharging from disused mines pollute rural water areas
Photo by Nicholas_T
RURAL AREAS
Natural organic wastes and soil can be one of the biggest causes of water pollution in some areas. Sediments build up over the time in rivers and lakes. As rain water washes soil, silt and organic debris from the land and into bodies of water contaminating them.
Photo by joiseyshowaa
RURAL AREAS
Pesticides are one of the more important causes of water pollution. Pesticides, including herbicides and fungicides are also part of the modern farmer's collection which can end up in water supplies. Farmers very often spray empty ground with herbicides which kill weeds and make it easier for them to then sow seeds later, after the herbicide has washed away and into bodies of water polluting them.
Photo by Monica's Dad
Health Effects of Toxic Runoff
In Louisiana, water quality can be so bad in many waterways that fish advisories are often posted to warn people against eating fish out of contaminated waterways. This is largely due to industrial runoff from localized sources and the accumulative effects of runoff and dumping from states that lie along the Mississippi river. When the river empties into Louisiana, it brings those accumulated toxins with it. This is believed to lead to higher rates of cancer in areas surrounding the Mississippi delta in an area that is often referred to as "cancer alley."
Photo by lagohsep
Water pollution in China
China is facing a water crisis. Its per capita water supply is significantly lower than the global average, but its demand for water is huge. Both industry and agriculture use massive amounts of water and create massive water pollution.
Photo by Sean Barnard
