The river system could potentially pick up chemicals in the water and then transport them in the direction of the water flow. The water could end up in a populated area that depends on that particular water source. This could lead to contamination of drinking water. It also has the potential to affect the ecosystem of the river and all the organisms living in it.
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Pollution in a watershed can harm the river system by contaminating the water with chemicals and toxins. This can disrupt the balance of the ecosystem, harm aquatic life, and affect water quality for human use. It can also lead to eutrophication, algal blooms, and ultimately degrade the health of the river system.
drainage basin
watershed
watershed
Watershed.
A watershed is composed of different sources of water that all run together. This might include a lake and river system.
Technically, a watershed is the dividing ridge between two catchments. A Catchment is the area of land with a common drainage system.
Because it is the land area that supplies water to a river system :)
The catchment is the correct answer. Commonly folk say 'watershed' but the watershed is the boundary (ridges etc) of the catchment.
I believe you might be referring to a "watershed".
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