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.
because of the fishes in the sea it is a batty boy fish
because of the fishes in the sea it is a batty boy fish
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.
stream piracy
I believe you might be referring to a "watershed".