Fresh Water Resources

Freshwater Re seminal fluids

Only 3% of Earth water is heady water.
Fresh water is usu completelyy considered a renewable resource. But, in some cases, like the Ogallala Aquifer that spans from South Dakota to Texas is non a renewable resource. The aquifer took more than a million years to collect and it is not replenished by rain. The Ogallala is expected to run dry in 20 to 40 years.

Water Pollution
Pollutants tummy enter the water show by run-off.
A pollutant is a harmful material that can enter the biosphere.
Point source Pollution- pollutants from a single source entering water. Factories atomic number 18 an example of point source pollution.
Nonpoint sources- pollutants from many, littler sources entering water.
Grease and oil washed off the streets by rain are examples.

The primary sources of water pollution are Nonpoint sources, residential sewage, and industrial/ agricultural chemicals.

Industrial and Agricultural Chemicals
PCBs- industrial pollutant in a class of organic chemicals.
In the 1970s PCBs were banned because they often entered mud and sand reservation it almost impossible to eliminate.
DDT- a pesticide, effectively controls agricultural pests and disease- carrying mosquitoes.
noisome industrial pollutants include heavy metals like Cadium, Lead, Mercury, and Zinc.




Instead of victimization harmful pesticides, farmers should use IPM (Integrated Pest Management)
IPM techniques include biological control- apply predators and parasites to regulate for pest insects, crop rotation, and the use of less condemnable sprays.

Water Quality and Sustainability
Some plants filter out definite pollutants. Forests and other vegetation help purify water that seeps into the ground.
Watershed- all land whose groundwater, streams, and rivers drain into the same place, like a mountainous lake.
One way of water conservation is drip irrigation.
pretermit Irrigation- delivers water drop by drop directly to the root of plants.

Biological Magnification
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