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Runoff driving matters accumulated on waterproofed surfaces of a farm (loafing sheds/pens, herd crossing areas, manure storage areas, etc), when no arrangement is made to collect these flows.
Collecting of separated domestic sewage in a system and stormwater in another. Separated collection has the advantage of avoiding the risk of sewage overflow into the environment when it rains. It allows better control of the pollution flow and concentration and better adapting the capacity of the wastewater treatment plants.