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Point sources come from discrete pipes flowing into a river for example

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Point sources come from discrete pipes flowing into a river for example. Non- point are more diffuse sources that don't come from one single pipe or outlet.

Point sources are for example, water discharging from an industrial plant of some kind or a waste water treatment plant. Non-point sources include run-off from agricultural lands that may wash fertilizer or other chemicals into lakes or rivers - this may occur over thousands of square kilometres.

From an environmental perspective, it is usually easier to deal with point source emitters than non- point.

See pic.